summaryrefslogtreecommitdiff
path: root/Source/kwsys/ProcessWin32.c
blob: 5aa4d8bf6ecaa99135bf48eaa3c02264889d345e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
/*============================================================================
  KWSys - Kitware System Library
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "kwsysPrivate.h"
#include KWSYS_HEADER(Process.h)
#include KWSYS_HEADER(System.h)

/* Work-around CMake dependency scanning limitation.  This must
   duplicate the above list of headers.  */
#if 0
# include "Process.h.in"
# include "System.h.in"
#endif

/*

Implementation for Windows

On windows, a thread is created to wait for data on each pipe.  The
threads are synchronized with the main thread to simulate the use of
a UNIX-style select system call.

On Windows9x platforms, a small WIN32 console application is spawned
in-between the calling process and the actual child to be executed.
This is to work-around a problem with connecting pipes from WIN16
console applications to WIN32 applications.

For more information, please check Microsoft Knowledge Base Articles
Q190351 and Q150956.

*/

#ifdef _MSC_VER
#pragma warning (push, 1)
#endif
#include <windows.h> /* Windows API */
#include <string.h>  /* strlen, strdup */
#include <stdio.h>   /* sprintf */
#include <io.h>      /* _unlink */
#ifdef __WATCOMC__
#define _unlink unlink
#endif

#ifndef _MAX_FNAME
#define _MAX_FNAME 4096
#endif
#ifndef _MAX_PATH
#define _MAX_PATH 4096
#endif

#ifdef _MSC_VER
#pragma warning (pop)
#pragma warning (disable: 4514)
#pragma warning (disable: 4706)
#endif

#if defined(__BORLANDC__)
# pragma warn -8004 /* assigned a value that is never used  */
# pragma warn -8060 /* Assignment inside if() condition.  */
#endif

/* There are pipes for the process pipeline's stdout and stderr.  */
#define KWSYSPE_PIPE_COUNT 2
#define KWSYSPE_PIPE_STDOUT 0
#define KWSYSPE_PIPE_STDERR 1

/* The maximum amount to read from a pipe at a time.  */
#define KWSYSPE_PIPE_BUFFER_SIZE 1024

/* Debug output macro.  */
#if 0
# define KWSYSPE_DEBUG(x) \
( \
  (void*)cp == (void*)0x00226DE0? \
  ( \
    fprintf(stderr, "%d/%p/%d ", (int)GetCurrentProcessId(), cp, __LINE__), \
    fprintf x, \
    fflush(stderr), \
    1 \
  ) : (1) \
)
#else
# define KWSYSPE_DEBUG(x) (void)1
#endif

#define kwsysEncodedWriteArrayProcessFwd9x kwsys_ns(EncodedWriteArrayProcessFwd9x)

typedef LARGE_INTEGER kwsysProcessTime;

typedef struct kwsysProcessCreateInformation_s
{
  /* Windows child startup control data.  */
  STARTUPINFO StartupInfo;

  /* Special error reporting pipe for Win9x forwarding executable.  */
  HANDLE ErrorPipeRead;
  HANDLE ErrorPipeWrite;
} kwsysProcessCreateInformation;

/*--------------------------------------------------------------------------*/
typedef struct kwsysProcessPipeData_s kwsysProcessPipeData;
static DWORD WINAPI kwsysProcessPipeThreadRead(LPVOID ptd);
static void kwsysProcessPipeThreadReadPipe(kwsysProcess* cp,
                                           kwsysProcessPipeData* td);
static DWORD WINAPI kwsysProcessPipeThreadWake(LPVOID ptd);
static void kwsysProcessPipeThreadWakePipe(kwsysProcess* cp,
                                           kwsysProcessPipeData* td);
static int kwsysProcessInitialize(kwsysProcess* cp);
static int kwsysProcessCreate(kwsysProcess* cp, int index,
                              kwsysProcessCreateInformation* si,
                              PHANDLE readEnd);
static void kwsysProcessDestroy(kwsysProcess* cp, int event);
static int kwsysProcessSetupOutputPipeFile(PHANDLE handle, const char* name);
static int kwsysProcessSetupSharedPipe(DWORD nStdHandle, PHANDLE handle);
static int kwsysProcessSetupPipeNative(PHANDLE handle, HANDLE p[2],
                                       int isWrite);
static void kwsysProcessCleanupHandle(PHANDLE h);
static void kwsysProcessCleanupHandleSafe(PHANDLE h, DWORD nStdHandle);
static void kwsysProcessCleanup(kwsysProcess* cp, int error);
static void kwsysProcessCleanErrorMessage(kwsysProcess* cp);
static int kwsysProcessComputeCommandLength(kwsysProcess* cp,
                                            char const* const* command);
static void kwsysProcessComputeCommandLine(kwsysProcess* cp,
                                           char const* const* command,
                                           char* cmd);
static int kwsysProcessGetTimeoutTime(kwsysProcess* cp, double* userTimeout,
                                      kwsysProcessTime* timeoutTime);
static int kwsysProcessGetTimeoutLeft(kwsysProcessTime* timeoutTime,
                                      double* userTimeout,
                                      kwsysProcessTime* timeoutLength);
static kwsysProcessTime kwsysProcessTimeGetCurrent(void);
static DWORD kwsysProcessTimeToDWORD(kwsysProcessTime t);
static double kwsysProcessTimeToDouble(kwsysProcessTime t);
static kwsysProcessTime kwsysProcessTimeFromDouble(double d);
static int kwsysProcessTimeLess(kwsysProcessTime in1, kwsysProcessTime in2);
static kwsysProcessTime kwsysProcessTimeAdd(kwsysProcessTime in1, kwsysProcessTime in2);
static kwsysProcessTime kwsysProcessTimeSubtract(kwsysProcessTime in1, kwsysProcessTime in2);
static void kwsysProcessSetExitException(kwsysProcess* cp, int code);
static void kwsysProcessKillTree(int pid);
static void kwsysProcessDisablePipeThreads(kwsysProcess* cp);
extern kwsysEXPORT int kwsysEncodedWriteArrayProcessFwd9x(const char* fname);

/*--------------------------------------------------------------------------*/
/* A structure containing synchronization data for each thread.  */
typedef struct kwsysProcessPipeSync_s kwsysProcessPipeSync;
struct kwsysProcessPipeSync_s
{
  /* Handle to the thread.  */
  HANDLE Thread;

  /* Semaphore indicating to the thread that a process has started.  */
  HANDLE Ready;

  /* Semaphore indicating to the thread that it should begin work.  */
  HANDLE Go;

  /* Semaphore indicating thread has reset for another process.  */
  HANDLE Reset;
};

/*--------------------------------------------------------------------------*/
/* A structure containing data for each pipe's threads.  */
struct kwsysProcessPipeData_s
{
  /* ------------- Data managed per instance of kwsysProcess ------------- */

  /* Synchronization data for reading thread.  */
  kwsysProcessPipeSync Reader;

  /* Synchronization data for waking thread.  */
  kwsysProcessPipeSync Waker;

  /* Index of this pipe.  */
  int Index;

  /* The kwsysProcess instance owning this pipe.  */
  kwsysProcess* Process;

  /* ------------- Data managed per call to Execute ------------- */

  /* Buffer for data read in this pipe's thread.  */
  char DataBuffer[KWSYSPE_PIPE_BUFFER_SIZE];

  /* The length of the data stored in the buffer.  */
  DWORD DataLength;

  /* Whether the pipe has been closed.  */
  int Closed;

  /* Handle for the read end of this pipe. */
  HANDLE Read;

  /* Handle for the write end of this pipe. */
  HANDLE Write;
};

/*--------------------------------------------------------------------------*/
/* Structure containing data used to implement the child's execution.  */
struct kwsysProcess_s
{
  /* ------------- Data managed per instance of kwsysProcess ------------- */

  /* The status of the process structure.  */
  int State;

  /* The command lines to execute.  */
  char** Commands;
  int NumberOfCommands;

  /* The exit code of each command.  */
  DWORD* CommandExitCodes;

  /* The working directory for the child process.  */
  char* WorkingDirectory;

  /* Whether to create the child as a detached process.  */
  int OptionDetach;

  /* Whether the child was created as a detached process.  */
  int Detached;

  /* Whether to hide the child process's window.  */
  int HideWindow;

  /* Whether to treat command lines as verbatim.  */
  int Verbatim;

  /* On Win9x platforms, the path to the forwarding executable.  */
  char* Win9x;

  /* On Win9x platforms, the resume event for the forwarding executable.  */
  HANDLE Win9xResumeEvent;

  /* On Win9x platforms, the kill event for the forwarding executable.  */
  HANDLE Win9xKillEvent;

  /* Mutex to protect the shared index used by threads to report data.  */
  HANDLE SharedIndexMutex;

  /* Semaphore used by threads to signal data ready.  */
  HANDLE Full;

  /* Whether we are currently deleting this kwsysProcess instance.  */
  int Deleting;

  /* Data specific to each pipe and its thread.  */
  kwsysProcessPipeData Pipe[KWSYSPE_PIPE_COUNT];

  /* Name of files to which stdin and stdout pipes are attached.  */
  char* PipeFileSTDIN;
  char* PipeFileSTDOUT;
  char* PipeFileSTDERR;

  /* Whether each pipe is shared with the parent process.  */
  int PipeSharedSTDIN;
  int PipeSharedSTDOUT;
  int PipeSharedSTDERR;

  /* Native pipes provided by the user.  */
  HANDLE PipeNativeSTDIN[2];
  HANDLE PipeNativeSTDOUT[2];
  HANDLE PipeNativeSTDERR[2];

  /* Handle to automatically delete the Win9x forwarding executable.  */
  HANDLE Win9xHandle;

  /* ------------- Data managed per call to Execute ------------- */

  /* The exceptional behavior that terminated the process, if any.  */
  int ExitException;

  /* The process exit code.  */
  DWORD ExitCode;

  /* The process return code, if any.  */
  int ExitValue;

  /* Index of last pipe to report data, if any.  */
  int CurrentIndex;

  /* Index shared by threads to report data.  */
  int SharedIndex;

  /* The timeout length.  */
  double Timeout;

  /* Time at which the child started.  */
  kwsysProcessTime StartTime;

  /* Time at which the child will timeout.  Negative for no timeout.  */
  kwsysProcessTime TimeoutTime;

  /* Flag for whether the process was killed.  */
  int Killed;

  /* Flag for whether the timeout expired.  */
  int TimeoutExpired;

  /* Flag for whether the process has terminated.  */
  int Terminated;

  /* The number of pipes still open during execution and while waiting
     for pipes to close after process termination.  */
  int PipesLeft;

  /* Buffer for error messages (possibly from Win9x child).  */
  char ErrorMessage[KWSYSPE_PIPE_BUFFER_SIZE+1];

  /* Description for the ExitException.  */
  char ExitExceptionString[KWSYSPE_PIPE_BUFFER_SIZE+1];

  /* Windows process information data.  */
  PROCESS_INFORMATION* ProcessInformation;

  /* Data and process termination events for which to wait.  */
  PHANDLE ProcessEvents;
  int ProcessEventsLength;

  /* Real working directory of our own process.  */
  DWORD RealWorkingDirectoryLength;
  char* RealWorkingDirectory;
};

/*--------------------------------------------------------------------------*/
kwsysProcess* kwsysProcess_New(void)
{
  int i;

  /* Process control structure.  */
  kwsysProcess* cp;

  /* Path to Win9x forwarding executable.  */
  char* win9x = 0;

  /* Windows version number data.  */
  OSVERSIONINFO osv;

  /* Allocate a process control structure.  */
  cp = (kwsysProcess*)malloc(sizeof(kwsysProcess));
  if(!cp)
    {
    /* Could not allocate memory for the control structure.  */
    return 0;
    }
  ZeroMemory(cp, sizeof(*cp));

  /* Share stdin with the parent process by default.  */
  cp->PipeSharedSTDIN = 1;

  /* Set initial status.  */
  cp->State = kwsysProcess_State_Starting;

  /* Choose a method of running the child based on version of
     windows.  */
  ZeroMemory(&osv, sizeof(osv));
  osv.dwOSVersionInfoSize = sizeof(osv);
  GetVersionEx(&osv);
  if(osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
    {
    /* This is Win9x.  We need the console forwarding executable to
       work-around a Windows 9x bug.  */
    char fwdName[_MAX_FNAME+1] = "";
    char tempDir[_MAX_PATH+1] = "";

    /* We will try putting the executable in the system temp
       directory.  Note that the returned path already has a trailing
       slash.  */
    DWORD length = GetTempPath(_MAX_PATH+1, tempDir);

    /* Construct the executable name from the process id and kwsysProcess
       instance.  This should be unique.  */
    sprintf(fwdName, KWSYS_NAMESPACE_STRING "pew9xfwd_%ld_%p.exe",
            GetCurrentProcessId(), cp);

    /* If we have a temp directory, use it.  */
    if(length > 0 && length <= _MAX_PATH)
      {
      /* Allocate a buffer to hold the forwarding executable path.  */
      size_t tdlen = strlen(tempDir);
      win9x = (char*)malloc(tdlen + strlen(fwdName) + 2);
      if(!win9x)
        {
        kwsysProcess_Delete(cp);
        return 0;
        }

      /* Construct the full path to the forwarding executable.  */
      sprintf(win9x, "%s%s", tempDir, fwdName);
      }

    /* If we found a place to put the forwarding executable, try to
       write it. */
    if(win9x)
      {
      if(!kwsysEncodedWriteArrayProcessFwd9x(win9x))
        {
        /* Failed to create forwarding executable.  Give up.  */
        free(win9x);
        kwsysProcess_Delete(cp);
        return 0;
        }

      /* Get a handle to the file that will delete it when closed.  */
      cp->Win9xHandle = CreateFile(win9x, GENERIC_READ, FILE_SHARE_READ, 0,
                                   OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, 0);
      if(cp->Win9xHandle == INVALID_HANDLE_VALUE)
        {
        /* We were not able to get a read handle for the forwarding
           executable.  It will not be deleted properly.  Give up.  */
        _unlink(win9x);
        free(win9x);
        kwsysProcess_Delete(cp);
        return 0;
        }
      }
    else
      {
      /* Failed to find a place to put forwarding executable.  */
      kwsysProcess_Delete(cp);
      return 0;
      }
    }

  /* Save the path to the forwarding executable.  */
  cp->Win9x = win9x;

  /* Initially no thread owns the mutex.  Initialize semaphore to 1.  */
  if(!(cp->SharedIndexMutex = CreateSemaphore(0, 1, 1, 0)))
    {
    kwsysProcess_Delete(cp);
    return 0;
    }

  /* Initially no data are available.  Initialize semaphore to 0.  */
  if(!(cp->Full = CreateSemaphore(0, 0, 1, 0)))
    {
    kwsysProcess_Delete(cp);
    return 0;
    }

  if(cp->Win9x)
    {
    SECURITY_ATTRIBUTES sa;
    ZeroMemory(&sa, sizeof(sa));
    sa.nLength = sizeof(sa);
    sa.bInheritHandle = TRUE;

    /* Create an event to tell the forwarding executable to resume the
       child.  */
    if(!(cp->Win9xResumeEvent = CreateEvent(&sa, TRUE, 0, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* Create an event to tell the forwarding executable to kill the
       child.  */
    if(!(cp->Win9xKillEvent = CreateEvent(&sa, TRUE, 0, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }
    }

  /* Create the thread to read each pipe.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    DWORD dummy=0;

    /* Assign the thread its index.  */
    cp->Pipe[i].Index = i;

    /* Give the thread a pointer back to the kwsysProcess instance.  */
    cp->Pipe[i].Process = cp;

    /* No process is yet running.  Initialize semaphore to 0.  */
    if(!(cp->Pipe[i].Reader.Ready = CreateSemaphore(0, 0, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* The pipe is not yet reset.  Initialize semaphore to 0.  */
    if(!(cp->Pipe[i].Reader.Reset = CreateSemaphore(0, 0, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* The thread's buffer is initially empty.  Initialize semaphore to 1.  */
    if(!(cp->Pipe[i].Reader.Go = CreateSemaphore(0, 1, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* Create the reading thread.  It will block immediately.  The
       thread will not make deeply nested calls, so we need only a
       small stack.  */
    if(!(cp->Pipe[i].Reader.Thread = CreateThread(0, 1024,
                                                  kwsysProcessPipeThreadRead,
                                                  &cp->Pipe[i], 0, &dummy)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* No process is yet running.  Initialize semaphore to 0.  */
    if(!(cp->Pipe[i].Waker.Ready = CreateSemaphore(0, 0, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* The pipe is not yet reset.  Initialize semaphore to 0.  */
    if(!(cp->Pipe[i].Waker.Reset = CreateSemaphore(0, 0, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* The waker should not wake immediately.  Initialize semaphore to 0.  */
    if(!(cp->Pipe[i].Waker.Go = CreateSemaphore(0, 0, 1, 0)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }

    /* Create the waking thread.  It will block immediately.  The
       thread will not make deeply nested calls, so we need only a
       small stack.  */
    if(!(cp->Pipe[i].Waker.Thread = CreateThread(0, 1024,
                                                 kwsysProcessPipeThreadWake,
                                                 &cp->Pipe[i], 0, &dummy)))
      {
      kwsysProcess_Delete(cp);
      return 0;
      }
    }

  return cp;
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_Delete(kwsysProcess* cp)
{
  int i;

  /* Make sure we have an instance.  */
  if(!cp)
    {
    return;
    }

  /* If the process is executing, wait for it to finish.  */
  if(cp->State == kwsysProcess_State_Executing)
    {
    if(cp->Detached)
      {
      kwsysProcess_Disown(cp);
      }
    else
      {
      kwsysProcess_WaitForExit(cp, 0);
      }
    }

  /* We are deleting the kwsysProcess instance.  */
  cp->Deleting = 1;

  /* Terminate each of the threads.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    /* Terminate this reading thread.  */
    if(cp->Pipe[i].Reader.Thread)
      {
      /* Signal the thread we are ready for it.  It will terminate
         immediately since Deleting is set.  */
      ReleaseSemaphore(cp->Pipe[i].Reader.Ready, 1, 0);

      /* Wait for the thread to exit.  */
      WaitForSingleObject(cp->Pipe[i].Reader.Thread, INFINITE);

      /* Close the handle to the thread. */
      kwsysProcessCleanupHandle(&cp->Pipe[i].Reader.Thread);
      }

    /* Terminate this waking thread.  */
    if(cp->Pipe[i].Waker.Thread)
      {
      /* Signal the thread we are ready for it.  It will terminate
         immediately since Deleting is set.  */
      ReleaseSemaphore(cp->Pipe[i].Waker.Ready, 1, 0);

      /* Wait for the thread to exit.  */
      WaitForSingleObject(cp->Pipe[i].Waker.Thread, INFINITE);

      /* Close the handle to the thread. */
      kwsysProcessCleanupHandle(&cp->Pipe[i].Waker.Thread);
      }

    /* Cleanup the pipe's semaphores.  */
    kwsysProcessCleanupHandle(&cp->Pipe[i].Reader.Ready);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Reader.Go);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Reader.Reset);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Waker.Ready);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Waker.Go);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Waker.Reset);
    }

  /* Close the shared semaphores.  */
  kwsysProcessCleanupHandle(&cp->SharedIndexMutex);
  kwsysProcessCleanupHandle(&cp->Full);

  /* Close the Win9x resume and kill event handles.  */
  if(cp->Win9x)
    {
    kwsysProcessCleanupHandle(&cp->Win9xResumeEvent);
    kwsysProcessCleanupHandle(&cp->Win9xKillEvent);
    }

  /* Free memory.  */
  kwsysProcess_SetCommand(cp, 0);
  kwsysProcess_SetWorkingDirectory(cp, 0);
  kwsysProcess_SetPipeFile(cp, kwsysProcess_Pipe_STDIN, 0);
  kwsysProcess_SetPipeFile(cp, kwsysProcess_Pipe_STDOUT, 0);
  kwsysProcess_SetPipeFile(cp, kwsysProcess_Pipe_STDERR, 0);
  if(cp->CommandExitCodes)
    {
    free(cp->CommandExitCodes);
    }
  if(cp->Win9x)
    {
    /* Close our handle to the forwarding executable file.  This will
       cause it to be deleted.  */
    kwsysProcessCleanupHandle(&cp->Win9xHandle);
    }
  free(cp);
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_SetCommand(kwsysProcess* cp, char const* const* command)
{
  int i;
  if(!cp)
    {
    return 0;
    }
  for(i=0; i < cp->NumberOfCommands; ++i)
    {
    free(cp->Commands[i]);
    }
  cp->NumberOfCommands = 0;
  if(cp->Commands)
    {
    free(cp->Commands);
    cp->Commands = 0;
    }
  if(command)
    {
    return kwsysProcess_AddCommand(cp, command);
    }
  return 1;
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_AddCommand(kwsysProcess* cp, char const* const* command)
{
  int newNumberOfCommands;
  char** newCommands;

  /* Make sure we have a command to add.  */
  if(!cp || !command || !*command)
    {
    return 0;
    }

  /* Allocate a new array for command pointers.  */
  newNumberOfCommands = cp->NumberOfCommands + 1;
  if(!(newCommands = (char**)malloc(sizeof(char*) * newNumberOfCommands)))
    {
    /* Out of memory.  */
    return 0;
    }

  /* Copy any existing commands into the new array.  */
  {
  int i;
  for(i=0; i < cp->NumberOfCommands; ++i)
    {
    newCommands[i] = cp->Commands[i];
    }
  }

  /* We need to construct a single string representing the command
     and its arguments.  We will surround each argument containing
     spaces with double-quotes.  Inside a double-quoted argument, we
     need to escape double-quotes and all backslashes before them.
     We also need to escape backslashes at the end of an argument
     because they come before the closing double-quote for the
     argument.  */
  {
  /* First determine the length of the final string.  */
  int length = kwsysProcessComputeCommandLength(cp, command);

  /* Allocate enough space for the command.  We do not need an extra
     byte for the terminating null because we allocated a space for
     the first argument that we will not use.  */
  newCommands[cp->NumberOfCommands] = (char*)malloc(length);
  if(!newCommands[cp->NumberOfCommands])
    {
    /* Out of memory.  */
    free(newCommands);
    return 0;
    }

  /* Construct the command line in the allocated buffer.  */
  kwsysProcessComputeCommandLine(cp, command,
                                 newCommands[cp->NumberOfCommands]);
  }

  /* Save the new array of commands.  */
  free(cp->Commands);
  cp->Commands = newCommands;
  cp->NumberOfCommands = newNumberOfCommands;
  return 1;
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_SetTimeout(kwsysProcess* cp, double timeout)
{
  if(!cp)
    {
    return;
    }
  cp->Timeout = timeout;
  if(cp->Timeout < 0)
    {
    cp->Timeout = 0;
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_SetWorkingDirectory(kwsysProcess* cp, const char* dir)
{
  if(!cp)
    {
    return 0;
    }
  if(cp->WorkingDirectory)
    {
    free(cp->WorkingDirectory);
    cp->WorkingDirectory = 0;
    }
  if(dir && dir[0])
    {
    /* We must convert the working directory to a full path.  */
    DWORD length = GetFullPathName(dir, 0, 0, 0);
    if(length > 0)
      {
      cp->WorkingDirectory = (char*)malloc(length);
      if(!cp->WorkingDirectory)
        {
        return 0;
        }
      if(!GetFullPathName(dir, length, cp->WorkingDirectory, 0))
        {
        free(cp->WorkingDirectory);
        cp->WorkingDirectory = 0;
        return 0;
        }
      }
    }
  return 1;
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_SetPipeFile(kwsysProcess* cp, int pipe, const char* file)
{
  char** pfile;
  if(!cp)
    {
    return 0;
    }
  switch(pipe)
    {
    case kwsysProcess_Pipe_STDIN: pfile = &cp->PipeFileSTDIN; break;
    case kwsysProcess_Pipe_STDOUT: pfile = &cp->PipeFileSTDOUT; break;
    case kwsysProcess_Pipe_STDERR: pfile = &cp->PipeFileSTDERR; break;
    default: return 0;
    }
  if(*pfile)
    {
    free(*pfile);
    *pfile = 0;
    }
  if(file)
    {
    *pfile = (char*)malloc(strlen(file)+1);
    if(!*pfile)
      {
      return 0;
      }
    strcpy(*pfile, file);
    }

  /* If we are redirecting the pipe, do not share it or use a native
     pipe.  */
  if(*pfile)
    {
    kwsysProcess_SetPipeNative(cp, pipe, 0);
    kwsysProcess_SetPipeShared(cp, pipe, 0);
    }

  return 1;
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_SetPipeShared(kwsysProcess* cp, int pipe, int shared)
{
  if(!cp)
    {
    return;
    }

  switch(pipe)
    {
    case kwsysProcess_Pipe_STDIN: cp->PipeSharedSTDIN = shared?1:0; break;
    case kwsysProcess_Pipe_STDOUT: cp->PipeSharedSTDOUT = shared?1:0; break;
    case kwsysProcess_Pipe_STDERR: cp->PipeSharedSTDERR = shared?1:0; break;
    default: return;
    }

  /* If we are sharing the pipe, do not redirect it to a file or use a
     native pipe.  */
  if(shared)
    {
    kwsysProcess_SetPipeFile(cp, pipe, 0);
    kwsysProcess_SetPipeNative(cp, pipe, 0);
    }
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_SetPipeNative(kwsysProcess* cp, int pipe, HANDLE p[2])
{
  HANDLE* pPipeNative = 0;

  if(!cp)
    {
    return;
    }

  switch(pipe)
    {
    case kwsysProcess_Pipe_STDIN: pPipeNative = cp->PipeNativeSTDIN; break;
    case kwsysProcess_Pipe_STDOUT: pPipeNative = cp->PipeNativeSTDOUT; break;
    case kwsysProcess_Pipe_STDERR: pPipeNative = cp->PipeNativeSTDERR; break;
    default: return;
    }

  /* Copy the native pipe handles provided.  */
  if(p)
    {
    pPipeNative[0] = p[0];
    pPipeNative[1] = p[1];
    }
  else
    {
    pPipeNative[0] = 0;
    pPipeNative[1] = 0;
    }

  /* If we are using a native pipe, do not share it or redirect it to
     a file.  */
  if(p)
    {
    kwsysProcess_SetPipeFile(cp, pipe, 0);
    kwsysProcess_SetPipeShared(cp, pipe, 0);
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_GetOption(kwsysProcess* cp, int optionId)
{
  if(!cp)
    {
    return 0;
    }

  switch(optionId)
    {
    case kwsysProcess_Option_Detach: return cp->OptionDetach;
    case kwsysProcess_Option_HideWindow: return cp->HideWindow;
    case kwsysProcess_Option_Verbatim: return cp->Verbatim;
    default: return 0;
    }
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_SetOption(kwsysProcess* cp, int optionId, int value)
{
  if(!cp)
    {
    return;
    }

  switch(optionId)
    {
    case kwsysProcess_Option_Detach: cp->OptionDetach = value; break;
    case kwsysProcess_Option_HideWindow: cp->HideWindow = value; break;
    case kwsysProcess_Option_Verbatim: cp->Verbatim = value; break;
    default: break;
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_GetState(kwsysProcess* cp)
{
  return cp? cp->State : kwsysProcess_State_Error;
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_GetExitException(kwsysProcess* cp)
{
  return cp? cp->ExitException : kwsysProcess_Exception_Other;
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_GetExitValue(kwsysProcess* cp)
{
  return cp? cp->ExitValue : -1;
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_GetExitCode(kwsysProcess* cp)
{
  return cp? cp->ExitCode : 0;
}

/*--------------------------------------------------------------------------*/
const char* kwsysProcess_GetErrorString(kwsysProcess* cp)
{
  if(!cp)
    {
    return "Process management structure could not be allocated";
    }
  else if(cp->State == kwsysProcess_State_Error)
    {
    return cp->ErrorMessage;
    }
  return "Success";
}

/*--------------------------------------------------------------------------*/
const char* kwsysProcess_GetExceptionString(kwsysProcess* cp)
{
  if(!cp)
    {
    return "GetExceptionString called with NULL process management structure";
    }
  else if(cp->State == kwsysProcess_State_Exception)
    {
    return cp->ExitExceptionString;
    }
  return "No exception";
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_Execute(kwsysProcess* cp)
{
  int i;

  /* Child startup control data.  */
  kwsysProcessCreateInformation si;

  /* Do not execute a second time.  */
  if(!cp || cp->State == kwsysProcess_State_Executing)
    {
    return;
    }

  /* Make sure we have something to run.  */
  if(cp->NumberOfCommands < 1)
    {
    strcpy(cp->ErrorMessage, "No command");
    cp->State = kwsysProcess_State_Error;
    return;
    }

  /* Initialize the control structure for a new process.  */
  if(!kwsysProcessInitialize(cp))
    {
    strcpy(cp->ErrorMessage, "Out of memory");
    cp->State = kwsysProcess_State_Error;
    return;
    }

  /* Save the real working directory of this process and change to
     the working directory for the child processes.  This is needed
     to make pipe file paths evaluate correctly.  */
  if(cp->WorkingDirectory)
    {
    if(!GetCurrentDirectory(cp->RealWorkingDirectoryLength,
                            cp->RealWorkingDirectory))
      {
      kwsysProcessCleanup(cp, 1);
      return;
      }
    SetCurrentDirectory(cp->WorkingDirectory);
    }

  /* Reset the Win9x resume and kill events.  */
  if(cp->Win9x)
    {
    if(!ResetEvent(cp->Win9xResumeEvent))
      {
      kwsysProcessCleanup(cp, 1);
      return;
      }
    if(!ResetEvent(cp->Win9xKillEvent))
      {
      kwsysProcessCleanup(cp, 1);
      return;
      }
    }

  /* Initialize startup info data.  */
  ZeroMemory(&si, sizeof(si));
  si.StartupInfo.cb = sizeof(si.StartupInfo);

  /* Decide whether a child window should be shown.  */
  si.StartupInfo.dwFlags |= STARTF_USESHOWWINDOW;
  si.StartupInfo.wShowWindow =
    (unsigned short)(cp->HideWindow?SW_HIDE:SW_SHOWDEFAULT);

  /* Connect the child's output pipes to the threads.  */
  si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;

  /* Create stderr pipe to be shared by all processes in the pipeline.
     Neither end is directly inherited.  */
  if(!CreatePipe(&cp->Pipe[KWSYSPE_PIPE_STDERR].Read,
                 &cp->Pipe[KWSYSPE_PIPE_STDERR].Write, 0, 0))
    {
    kwsysProcessCleanup(cp, 1);
    return;
    }

  /* Create an inherited duplicate of the write end, but do not
     close the non-inherited version.  We need to keep it open
     to use in waking up the pipe threads.  */
  if(!DuplicateHandle(GetCurrentProcess(), cp->Pipe[KWSYSPE_PIPE_STDERR].Write,
                      GetCurrentProcess(), &si.StartupInfo.hStdError,
                      0, TRUE, DUPLICATE_SAME_ACCESS))
    {
    kwsysProcessCleanup(cp, 1);
    kwsysProcessCleanupHandle(&si.StartupInfo.hStdError);
    return;
    }

  /* Replace the stderr pipe with a file if requested.  In this case
     the pipe thread will still run but never report data.  */
  if(cp->PipeFileSTDERR)
    {
    if(!kwsysProcessSetupOutputPipeFile(&si.StartupInfo.hStdError,
                                        cp->PipeFileSTDERR))
      {
      kwsysProcessCleanup(cp, 1);
      kwsysProcessCleanupHandle(&si.StartupInfo.hStdError);
      return;
      }
    }

  /* Replace the stderr pipe with the parent process's if requested.
     In this case the pipe thread will still run but never report
     data.  */
  if(cp->PipeSharedSTDERR)
    {
    if(!kwsysProcessSetupSharedPipe(STD_ERROR_HANDLE,
                                    &si.StartupInfo.hStdError))
      {
      kwsysProcessCleanup(cp, 1);
      kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdError,
                                    STD_ERROR_HANDLE);
      return;
      }
    }

  /* Replace the stderr pipe with the native pipe provided if any.  In
     this case the pipe thread will still run but never report
     data.  */
  if(cp->PipeNativeSTDERR[1])
    {
    if(!kwsysProcessSetupPipeNative(&si.StartupInfo.hStdError,
                                    cp->PipeNativeSTDERR, 1))
      {
      kwsysProcessCleanup(cp, 1);
      kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdError,
                                    STD_ERROR_HANDLE);
      return;
      }
    }

  /* Create the pipeline of processes.  */
  {
  HANDLE readEnd = 0;
  for(i=0; i < cp->NumberOfCommands; ++i)
    {
    if(kwsysProcessCreate(cp, i, &si, &readEnd))
      {
      cp->ProcessEvents[i+1] = cp->ProcessInformation[i].hProcess;
      }
    else
      {
      kwsysProcessCleanup(cp, 1);

      /* Release resources that may have been allocated for this
         process before an error occurred.  */
      kwsysProcessCleanupHandle(&readEnd);
      kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdInput,
                                    STD_INPUT_HANDLE);
      kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdOutput,
                                    STD_OUTPUT_HANDLE);
      kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdError,
                                    STD_ERROR_HANDLE);
      kwsysProcessCleanupHandle(&si.ErrorPipeRead);
      kwsysProcessCleanupHandle(&si.ErrorPipeWrite);
      return;
      }
    }

  /* Save a handle to the output pipe for the last process.  */
  cp->Pipe[KWSYSPE_PIPE_STDOUT].Read = readEnd;
  }

  /* Close the inherited handles to the stderr pipe shared by all
     processes in the pipeline.  The stdout and stdin pipes are not
     shared among all children and are therefore closed by
     kwsysProcessCreate after each child is created.  */
  kwsysProcessCleanupHandleSafe(&si.StartupInfo.hStdError, STD_ERROR_HANDLE);

  /* Restore the working directory.  */
  if(cp->RealWorkingDirectory)
    {
    SetCurrentDirectory(cp->RealWorkingDirectory);
    free(cp->RealWorkingDirectory);
    cp->RealWorkingDirectory = 0;
    }

  /* The timeout period starts now.  */
  cp->StartTime = kwsysProcessTimeGetCurrent();
  cp->TimeoutTime = kwsysProcessTimeFromDouble(-1);

  /* All processes in the pipeline have been started in suspended
     mode.  Resume them all now.  */
  if(cp->Win9x)
    {
    SetEvent(cp->Win9xResumeEvent);
    }
  else
    {
    for(i=0; i < cp->NumberOfCommands; ++i)
      {
      ResumeThread(cp->ProcessInformation[i].hThread);
      }
    }

  /* ---- It is no longer safe to call kwsysProcessCleanup. ----- */
  /* Tell the pipe threads that a process has started.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    ReleaseSemaphore(cp->Pipe[i].Reader.Ready, 1, 0);
    ReleaseSemaphore(cp->Pipe[i].Waker.Ready, 1, 0);
    }

  /* We don't care about the children's main threads.  */
  for(i=0; i < cp->NumberOfCommands; ++i)
    {
    kwsysProcessCleanupHandle(&cp->ProcessInformation[i].hThread);
    }

  /* No pipe has reported data.  */
  cp->CurrentIndex = KWSYSPE_PIPE_COUNT;
  cp->PipesLeft = KWSYSPE_PIPE_COUNT;

  /* The process has now started.  */
  cp->State = kwsysProcess_State_Executing;
  cp->Detached = cp->OptionDetach;
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_Disown(kwsysProcess* cp)
{
  int i;

  /* Make sure we are executing a detached process.  */
  if(!cp || !cp->Detached || cp->State != kwsysProcess_State_Executing ||
     cp->TimeoutExpired || cp->Killed || cp->Terminated)
    {
    return;
    }

  /* Disable the reading threads.  */
  kwsysProcessDisablePipeThreads(cp);

  /* Wait for all pipe threads to reset.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    WaitForSingleObject(cp->Pipe[i].Reader.Reset, INFINITE);
    WaitForSingleObject(cp->Pipe[i].Waker.Reset, INFINITE);
    }

  /* We will not wait for exit, so cleanup now.  */
  kwsysProcessCleanup(cp, 0);

  /* The process has been disowned.  */
  cp->State = kwsysProcess_State_Disowned;
}

/*--------------------------------------------------------------------------*/

int kwsysProcess_WaitForData(kwsysProcess* cp, char** data, int* length,
                             double* userTimeout)
{
  kwsysProcessTime userStartTime;
  kwsysProcessTime timeoutLength;
  kwsysProcessTime timeoutTime;
  DWORD timeout;
  int user;
  int done = 0;
  int expired = 0;
  int pipeId = kwsysProcess_Pipe_None;
  DWORD w;

  /* Make sure we are executing a process.  */
  if(!cp || cp->State != kwsysProcess_State_Executing || cp->Killed ||
     cp->TimeoutExpired)
    {
    return kwsysProcess_Pipe_None;
    }

  /* Record the time at which user timeout period starts.  */
  userStartTime = kwsysProcessTimeGetCurrent();

  /* Calculate the time at which a timeout will expire, and whether it
     is the user or process timeout.  */
  user = kwsysProcessGetTimeoutTime(cp, userTimeout, &timeoutTime);

  /* Loop until we have a reason to return.  */
  while(!done && cp->PipesLeft > 0)
    {
    /* If we previously got data from a thread, let it know we are
       done with the data.  */
    if(cp->CurrentIndex < KWSYSPE_PIPE_COUNT)
      {
      KWSYSPE_DEBUG((stderr, "releasing reader %d\n", cp->CurrentIndex));
      ReleaseSemaphore(cp->Pipe[cp->CurrentIndex].Reader.Go, 1, 0);
      cp->CurrentIndex = KWSYSPE_PIPE_COUNT;
      }

    /* Setup a timeout if required.  */
    if(kwsysProcessGetTimeoutLeft(&timeoutTime, user?userTimeout:0,
                                  &timeoutLength))
      {
      /* Timeout has already expired.  */
      expired = 1;
      break;
      }
    if(timeoutTime.QuadPart < 0)
      {
      timeout = INFINITE;
      }
    else
      {
      timeout = kwsysProcessTimeToDWORD(timeoutLength);
      }

    /* Wait for a pipe's thread to signal or a process to terminate.  */
    w = WaitForMultipleObjects(cp->ProcessEventsLength, cp->ProcessEvents,
                               0, timeout);
    if(w == WAIT_TIMEOUT)
      {
      /* Timeout has expired.  */
      expired = 1;
      done = 1;
      }
    else if(w == WAIT_OBJECT_0)
      {
      /* Save the index of the reporting thread and release the mutex.
         The thread will block until we signal its Empty mutex.  */
      cp->CurrentIndex = cp->SharedIndex;
      ReleaseSemaphore(cp->SharedIndexMutex, 1, 0);

      /* Data are available or a pipe closed.  */
      if(cp->Pipe[cp->CurrentIndex].Closed)
        {
        /* The pipe closed at the write end.  Close the read end and
           inform the wakeup thread it is done with this process.  */
        kwsysProcessCleanupHandle(&cp->Pipe[cp->CurrentIndex].Read);
        ReleaseSemaphore(cp->Pipe[cp->CurrentIndex].Waker.Go, 1, 0);
        KWSYSPE_DEBUG((stderr, "wakeup %d\n", cp->CurrentIndex));
        --cp->PipesLeft;
        }
      else if(data && length)
        {
        /* Report this data.  */
        *data = cp->Pipe[cp->CurrentIndex].DataBuffer;
        *length = cp->Pipe[cp->CurrentIndex].DataLength;
        switch(cp->CurrentIndex)
          {
          case KWSYSPE_PIPE_STDOUT:
            pipeId = kwsysProcess_Pipe_STDOUT; break;
          case KWSYSPE_PIPE_STDERR:
            pipeId = kwsysProcess_Pipe_STDERR; break;
          }
        done = 1;
        }
      }
    else
      {
      /* A process has terminated.  */
      kwsysProcessDestroy(cp, w-WAIT_OBJECT_0);
      }
    }

  /* Update the user timeout.  */
  if(userTimeout)
    {
    kwsysProcessTime userEndTime = kwsysProcessTimeGetCurrent();
    kwsysProcessTime difference = kwsysProcessTimeSubtract(userEndTime,
                                                           userStartTime);
    double d = kwsysProcessTimeToDouble(difference);
    *userTimeout -= d;
    if(*userTimeout < 0)
      {
      *userTimeout = 0;
      }
    }

  /* Check what happened.  */
  if(pipeId)
    {
    /* Data are ready on a pipe.  */
    return pipeId;
    }
  else if(expired)
    {
    /* A timeout has expired.  */
    if(user)
      {
      /* The user timeout has expired.  It has no time left.  */
      return kwsysProcess_Pipe_Timeout;
      }
    else
      {
      /* The process timeout has expired.  Kill the child now.  */
      KWSYSPE_DEBUG((stderr, "killing child because timeout expired\n"));
      kwsysProcess_Kill(cp);
      cp->TimeoutExpired = 1;
      cp->Killed = 0;
      return kwsysProcess_Pipe_None;
      }
    }
  else
    {
    /* The children have terminated and no more data are available.  */
    return kwsysProcess_Pipe_None;
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcess_WaitForExit(kwsysProcess* cp, double* userTimeout)
{
  int i;
  int pipe;

  /* Make sure we are executing a process.  */
  if(!cp || cp->State != kwsysProcess_State_Executing)
    {
    return 1;
    }

  /* Wait for the process to terminate.  Ignore all data.  */
  while((pipe = kwsysProcess_WaitForData(cp, 0, 0, userTimeout)) > 0)
    {
    if(pipe == kwsysProcess_Pipe_Timeout)
      {
      /* The user timeout has expired.  */
      return 0;
      }
    }

  KWSYSPE_DEBUG((stderr, "no more data\n"));

  /* When the last pipe closes in WaitForData, the loop terminates
     without releasing the pipe's thread.  Release it now.  */
  if(cp->CurrentIndex < KWSYSPE_PIPE_COUNT)
    {
    KWSYSPE_DEBUG((stderr, "releasing reader %d\n", cp->CurrentIndex));
    ReleaseSemaphore(cp->Pipe[cp->CurrentIndex].Reader.Go, 1, 0);
    cp->CurrentIndex = KWSYSPE_PIPE_COUNT;
    }

  /* Wait for all pipe threads to reset.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    KWSYSPE_DEBUG((stderr, "waiting reader reset %d\n", i));
    WaitForSingleObject(cp->Pipe[i].Reader.Reset, INFINITE);
    KWSYSPE_DEBUG((stderr, "waiting waker reset %d\n", i));
    WaitForSingleObject(cp->Pipe[i].Waker.Reset, INFINITE);
    }

  /* ---- It is now safe again to call kwsysProcessCleanup. ----- */
  /* Close all the pipes.  */
  kwsysProcessCleanup(cp, 0);

  /* Determine the outcome.  */
  if(cp->Killed)
    {
    /* We killed the child.  */
    cp->State = kwsysProcess_State_Killed;
    }
  else if(cp->TimeoutExpired)
    {
    /* The timeout expired.  */
    cp->State = kwsysProcess_State_Expired;
    }
  else
    {
    /* The children exited.  Report the outcome of the last process.  */
    cp->ExitCode = cp->CommandExitCodes[cp->NumberOfCommands-1];
    if((cp->ExitCode & 0xF0000000) == 0xC0000000)
      {
      /* Child terminated due to exceptional behavior.  */
      cp->State = kwsysProcess_State_Exception;
      cp->ExitValue = 1;
      kwsysProcessSetExitException(cp, cp->ExitCode);
      }
    else
      {
      /* Child exited without exception.  */
      cp->State = kwsysProcess_State_Exited;
      cp->ExitException = kwsysProcess_Exception_None;
      cp->ExitValue = cp->ExitCode;
      }
    }

  return 1;
}

/*--------------------------------------------------------------------------*/
void kwsysProcess_Kill(kwsysProcess* cp)
{
  int i;
  /* Make sure we are executing a process.  */
  if(!cp || cp->State != kwsysProcess_State_Executing || cp->TimeoutExpired ||
     cp->Killed)
    {
    KWSYSPE_DEBUG((stderr, "kill: child not executing\n"));
    return;
    }

  /* Disable the reading threads.  */
  KWSYSPE_DEBUG((stderr, "kill: disabling pipe threads\n"));
  kwsysProcessDisablePipeThreads(cp);

  /* Skip actually killing the child if it has already terminated.  */
  if(cp->Terminated)
    {
    KWSYSPE_DEBUG((stderr, "kill: child already terminated\n"));
    return;
    }

  /* Kill the children.  */
  cp->Killed = 1;
  if(cp->Win9x)
    {
    /* Windows 9x.  Tell the forwarding executable to kill the child.  */
    SetEvent(cp->Win9xKillEvent);
    }
  else
    {
    /* Not Windows 9x.  Just terminate the children.  */
    for(i=0; i < cp->NumberOfCommands; ++i)
      {
      kwsysProcessKillTree(cp->ProcessInformation[i].dwProcessId); 
      // close the handle if we kill it
      kwsysProcessCleanupHandle(&cp->ProcessInformation[i].hThread);
      kwsysProcessCleanupHandle(&cp->ProcessInformation[i].hProcess);
      }
    }

  /* We are killing the children and ignoring all data.  Do not wait
     for them to exit.  */
}

/*--------------------------------------------------------------------------*/

/*
  Function executed for each pipe's thread.  Argument is a pointer to
  the kwsysProcessPipeData instance for this thread.
*/
DWORD WINAPI kwsysProcessPipeThreadRead(LPVOID ptd)
{
  kwsysProcessPipeData* td = (kwsysProcessPipeData*)ptd;
  kwsysProcess* cp = td->Process;

  /* Wait for a process to be ready.  */
  while((WaitForSingleObject(td->Reader.Ready, INFINITE), !cp->Deleting))
    {
    /* Read output from the process for this thread's pipe.  */
    kwsysProcessPipeThreadReadPipe(cp, td);

    /* Signal the main thread we have reset for a new process.  */
    ReleaseSemaphore(td->Reader.Reset, 1, 0);
    }
  return 0;
}

/*--------------------------------------------------------------------------*/

/*
  Function called in each pipe's thread to handle data for one
  execution of a subprocess.
*/
void kwsysProcessPipeThreadReadPipe(kwsysProcess* cp, kwsysProcessPipeData* td)
{
  /* Wait for space in the thread's buffer. */
  while((KWSYSPE_DEBUG((stderr, "wait for read %d\n", td->Index)),
         WaitForSingleObject(td->Reader.Go, INFINITE), !td->Closed))
    {
    KWSYSPE_DEBUG((stderr, "reading %d\n", td->Index));

    /* Read data from the pipe.  This may block until data are available.  */
    if(!ReadFile(td->Read, td->DataBuffer, KWSYSPE_PIPE_BUFFER_SIZE,
                 &td->DataLength, 0))
      {
      if(GetLastError() != ERROR_BROKEN_PIPE)
        {
        /* UNEXPECTED failure to read the pipe.  */
        }

      /* The pipe closed.  There are no more data to read.  */
      td->Closed = 1;
      KWSYSPE_DEBUG((stderr, "read closed %d\n", td->Index));
      }

    KWSYSPE_DEBUG((stderr, "read %d\n", td->Index));

    /* Wait for our turn to be handled by the main thread.  */
    WaitForSingleObject(cp->SharedIndexMutex, INFINITE);

    KWSYSPE_DEBUG((stderr, "reporting read %d\n", td->Index));

    /* Tell the main thread we have something to report.  */
    cp->SharedIndex = td->Index;
    ReleaseSemaphore(cp->Full, 1, 0);
    }

  /* We were signalled to exit with our buffer empty.  Reset the
     mutex for a new process.  */
  KWSYSPE_DEBUG((stderr, "self releasing reader %d\n", td->Index));
  ReleaseSemaphore(td->Reader.Go, 1, 0);
}

/*--------------------------------------------------------------------------*/

/*
  Function executed for each pipe's thread.  Argument is a pointer to
  the kwsysProcessPipeData instance for this thread.
*/
DWORD WINAPI kwsysProcessPipeThreadWake(LPVOID ptd)
{
  kwsysProcessPipeData* td = (kwsysProcessPipeData*)ptd;
  kwsysProcess* cp = td->Process;

  /* Wait for a process to be ready.  */
  while((WaitForSingleObject(td->Waker.Ready, INFINITE), !cp->Deleting))
    {
    /* Wait for a possible wakeup.  */
    kwsysProcessPipeThreadWakePipe(cp, td);

    /* Signal the main thread we have reset for a new process.  */
    ReleaseSemaphore(td->Waker.Reset, 1, 0);
    }
  return 0;
}

/*--------------------------------------------------------------------------*/

/*
  Function called in each pipe's thread to handle reading thread
  wakeup for one execution of a subprocess.
*/
void kwsysProcessPipeThreadWakePipe(kwsysProcess* cp, kwsysProcessPipeData* td)
{
  (void)cp;

  /* Wait for a possible wake command. */
  KWSYSPE_DEBUG((stderr, "wait for wake %d\n", td->Index));
  WaitForSingleObject(td->Waker.Go, INFINITE);
  KWSYSPE_DEBUG((stderr, "waking %d\n", td->Index));

  /* If the pipe is not closed, we need to wake up the reading thread.  */
  if(!td->Closed)
    {
    DWORD dummy;
    KWSYSPE_DEBUG((stderr, "waker %d writing byte\n", td->Index));
    WriteFile(td->Write, "", 1, &dummy, 0);
    KWSYSPE_DEBUG((stderr, "waker %d wrote byte\n", td->Index));
    }
}

/*--------------------------------------------------------------------------*/
/* Initialize a process control structure for kwsysProcess_Execute.  */
int kwsysProcessInitialize(kwsysProcess* cp)
{
  /* Reset internal status flags.  */
  cp->TimeoutExpired = 0;
  cp->Terminated = 0;
  cp->Killed = 0;
  cp->ExitException = kwsysProcess_Exception_None;
  cp->ExitCode = 1;
  cp->ExitValue = 1;

  /* Reset error data.  */
  cp->ErrorMessage[0] = 0;
  strcpy(cp->ExitExceptionString, "No exception");

  /* Allocate process information for each process.  */
  cp->ProcessInformation =
    (PROCESS_INFORMATION*)malloc(sizeof(PROCESS_INFORMATION) *
                                 cp->NumberOfCommands);
  if(!cp->ProcessInformation)
    {
    return 0;
    }
  ZeroMemory(cp->ProcessInformation,
             sizeof(PROCESS_INFORMATION) * cp->NumberOfCommands);
  if(cp->CommandExitCodes)
    {
    free(cp->CommandExitCodes);
    }
  cp->CommandExitCodes = (DWORD*)malloc(sizeof(DWORD)*cp->NumberOfCommands);
  if(!cp->CommandExitCodes)
    {
    return 0;
    }
  ZeroMemory(cp->CommandExitCodes, sizeof(DWORD)*cp->NumberOfCommands);

  /* Allocate event wait array.  The first event is cp->Full, the rest
     are the process termination events.  */
  cp->ProcessEvents = (PHANDLE)malloc(sizeof(HANDLE)*(cp->NumberOfCommands+1));
  if(!cp->ProcessEvents)
    {
    return 0;
    }
  ZeroMemory(cp->ProcessEvents, sizeof(HANDLE) * (cp->NumberOfCommands+1));
  cp->ProcessEvents[0] = cp->Full;
  cp->ProcessEventsLength = cp->NumberOfCommands+1;

  /* Allocate space to save the real working directory of this process.  */
  if(cp->WorkingDirectory)
    {
    cp->RealWorkingDirectoryLength = GetCurrentDirectory(0, 0);
    if(cp->RealWorkingDirectoryLength > 0)
      {
      cp->RealWorkingDirectory = (char*)malloc(cp->RealWorkingDirectoryLength);
      if(!cp->RealWorkingDirectory)
        {
        return 0;
        }
      }
    }

  return 1;
}

/*--------------------------------------------------------------------------*/
int kwsysProcessCreate(kwsysProcess* cp, int index,
                       kwsysProcessCreateInformation* si,
                       PHANDLE readEnd)
{
  /* Setup the process's stdin.  */
  if(*readEnd)
    {
    /* Create an inherited duplicate of the read end from the output
       pipe of the previous process.  This also closes the
       non-inherited version. */
    if(!DuplicateHandle(GetCurrentProcess(), *readEnd,
                        GetCurrentProcess(), readEnd,
                        0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                  DUPLICATE_SAME_ACCESS)))
      {
      return 0;
      }
    si->StartupInfo.hStdInput = *readEnd;

    /* This function is done with this handle.  */
    *readEnd = 0;
    }
  else if(cp->PipeFileSTDIN)
    {
    /* Create a handle to read a file for stdin.  */
    HANDLE fin = CreateFile(cp->PipeFileSTDIN, GENERIC_READ|GENERIC_WRITE,
                            FILE_SHARE_READ|FILE_SHARE_WRITE,
                            0, OPEN_EXISTING, 0, 0);
    if(fin == INVALID_HANDLE_VALUE)
      {
      return 0;
      }
    /* Create an inherited duplicate of the handle.  This also closes
       the non-inherited version.  */
    if(!DuplicateHandle(GetCurrentProcess(), fin,
                        GetCurrentProcess(), &fin,
                        0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                  DUPLICATE_SAME_ACCESS)))
      {
      return 0;
      }
    si->StartupInfo.hStdInput = fin;
    }
  else if(cp->PipeSharedSTDIN)
    {
    /* Share this process's stdin with the child.  */
    if(!kwsysProcessSetupSharedPipe(STD_INPUT_HANDLE,
                                    &si->StartupInfo.hStdInput))
      {
      return 0;
      }
    }
  else if(cp->PipeNativeSTDIN[0])
    {
    /* Use the provided native pipe.  */
    if(!kwsysProcessSetupPipeNative(&si->StartupInfo.hStdInput,
                                    cp->PipeNativeSTDIN, 0))
      {
      return 0;
      }
    }
  else
    {
    /* Explicitly give the child no stdin.  */
    si->StartupInfo.hStdInput = INVALID_HANDLE_VALUE;
    }

  /* Setup the process's stdout.  */
  {
  DWORD maybeClose = DUPLICATE_CLOSE_SOURCE;
  HANDLE writeEnd;

  /* Create the output pipe for this process.  Neither end is directly
     inherited.  */
  if(!CreatePipe(readEnd, &writeEnd, 0, 0))
    {
    return 0;
    }

  /* Create an inherited duplicate of the write end.  Close the
     non-inherited version unless this is the last process.  Save the
     non-inherited write end of the last process.  */
  if(index == cp->NumberOfCommands-1)
    {
    cp->Pipe[KWSYSPE_PIPE_STDOUT].Write = writeEnd;
    maybeClose = 0;
    }
  if(!DuplicateHandle(GetCurrentProcess(), writeEnd,
                      GetCurrentProcess(), &writeEnd,
                      0, TRUE, (maybeClose | DUPLICATE_SAME_ACCESS)))
    {
    return 0;
    }
  si->StartupInfo.hStdOutput = writeEnd;
  }

  /* Replace the stdout pipe with a file if requested.  In this case
     the pipe thread will still run but never report data.  */
  if(index == cp->NumberOfCommands-1 && cp->PipeFileSTDOUT)
    {
    if(!kwsysProcessSetupOutputPipeFile(&si->StartupInfo.hStdOutput,
                                        cp->PipeFileSTDOUT))
      {
      return 0;
      }
    }

  /* Replace the stdout pipe of the last child with the parent
     process's if requested.  In this case the pipe thread will still
     run but never report data.  */
  if(index == cp->NumberOfCommands-1 && cp->PipeSharedSTDOUT)
    {
    if(!kwsysProcessSetupSharedPipe(STD_OUTPUT_HANDLE,
                                    &si->StartupInfo.hStdOutput))
      {
      return 0;
      }
    }

  /* Replace the stdout pipe with the native pipe provided if any.  In
     this case the pipe thread will still run but never report
     data.  */
  if(index == cp->NumberOfCommands-1 && cp->PipeNativeSTDOUT[1])
    {
    if(!kwsysProcessSetupPipeNative(&si->StartupInfo.hStdOutput,
                                    cp->PipeNativeSTDOUT, 1))
      {
      return 0;
      }
    }

  /* Create the child process.  */
  {
  BOOL r;
  char* realCommand;
  if(cp->Win9x)
    {
    /* Create an error reporting pipe for the forwarding executable.
       Neither end is directly inherited.  */
    if(!CreatePipe(&si->ErrorPipeRead, &si->ErrorPipeWrite, 0, 0))
      {
      return 0;
      }

    /* Create an inherited duplicate of the write end.  This also closes
       the non-inherited version. */
    if(!DuplicateHandle(GetCurrentProcess(), si->ErrorPipeWrite,
                        GetCurrentProcess(), &si->ErrorPipeWrite,
                        0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                  DUPLICATE_SAME_ACCESS)))
      {
      return 0;
      }

    /* The forwarding executable is given a handle to the error pipe
       and resume and kill events.  */
    realCommand = (char*)malloc(strlen(cp->Win9x)+strlen(cp->Commands[index])+100);
    if(!realCommand)
      {
      return 0;
      }
    sprintf(realCommand, "%s %p %p %p %d %s", cp->Win9x,
            si->ErrorPipeWrite, cp->Win9xResumeEvent, cp->Win9xKillEvent,
            cp->HideWindow, cp->Commands[index]);
    }
  else
    {
    realCommand = cp->Commands[index];
    }

  /* Create the child in a suspended state so we can wait until all
     children have been created before running any one.  */
  r = CreateProcess(0, realCommand, 0, 0, TRUE,
                    cp->Win9x? 0 : CREATE_SUSPENDED, 0, 0,
                    &si->StartupInfo, &cp->ProcessInformation[index]);
  if(cp->Win9x)
    {
    /* Free memory.  */
    free(realCommand);

    /* Close the error pipe write end so we can detect when the
       forwarding executable closes it.  */
    kwsysProcessCleanupHandle(&si->ErrorPipeWrite);
    if(r)
      {
      /* Wait for the forwarding executable to report an error or
         close the error pipe to report success.  */
      DWORD total = 0;
      DWORD n = 1;
      while(total < KWSYSPE_PIPE_BUFFER_SIZE && n > 0)
        {
        if(ReadFile(si->ErrorPipeRead, cp->ErrorMessage+total,
                    KWSYSPE_PIPE_BUFFER_SIZE-total, &n, 0))
          {
          total += n;
          }
        else
          {
          n = 0;
          }
        }
      if(total > 0 || GetLastError() != ERROR_BROKEN_PIPE)
        {
        /* The forwarding executable could not run the process, or
           there was an error reading from its error pipe.  Preserve
           the last error while cleaning up the forwarding executable
           so the cleanup our caller does reports the proper error.  */
        DWORD error = GetLastError();
        kwsysProcessCleanupHandle(&cp->ProcessInformation[index].hThread);
        kwsysProcessCleanupHandle(&cp->ProcessInformation[index].hProcess);
        SetLastError(error);
        return 0;
        }
      }
    kwsysProcessCleanupHandle(&si->ErrorPipeRead);
    }

  if(!r)
    {
    return 0;
    }
  }

  /* Successfully created this child process.  Close the current
     process's copies of the inherited stdout and stdin handles.  The
     stderr handle is shared among all children and is closed by
     kwsysProcess_Execute after all children have been created.  */
  kwsysProcessCleanupHandleSafe(&si->StartupInfo.hStdInput,
                                STD_INPUT_HANDLE);
  kwsysProcessCleanupHandleSafe(&si->StartupInfo.hStdOutput,
                                STD_OUTPUT_HANDLE);

  return 1;
}

/*--------------------------------------------------------------------------*/
void kwsysProcessDestroy(kwsysProcess* cp, int event)
{
  int i;
  int index;

  /* Find the process index for the termination event.  */
  for(index=0; index < cp->NumberOfCommands; ++index)
    {
    if(cp->ProcessInformation[index].hProcess == cp->ProcessEvents[event])
      {
      break;
      }
    }

  /* Check the exit code of the process.  */
  GetExitCodeProcess(cp->ProcessInformation[index].hProcess,
                     &cp->CommandExitCodes[index]);

  /* Close the process handle for the terminated process.  */
  kwsysProcessCleanupHandle(&cp->ProcessInformation[index].hProcess);

  /* Remove the process from the available events.  */
  cp->ProcessEventsLength -= 1;
  for(i=event; i < cp->ProcessEventsLength; ++i)
    {
    cp->ProcessEvents[i] = cp->ProcessEvents[i+1];
    }

  /* Check if all processes have terminated.  */
  if(cp->ProcessEventsLength == 1)
    {
    cp->Terminated = 1;

    /* Close our copies of the pipe write handles so the pipe threads
       can detect end-of-data.  */
    for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
      {
      /* TODO: If the child created its own child (our grandchild)
         which inherited a copy of the pipe write-end then the pipe
         may not close and we will still need the waker write pipe.
         However we still want to be able to detect end-of-data in the
         normal case.  The reader thread will have to switch to using
         PeekNamedPipe to read the last bit of data from the pipe
         without blocking.  This is equivalent to using a non-blocking
         read on posix.  */
      KWSYSPE_DEBUG((stderr, "closing wakeup write %d\n", i));
      kwsysProcessCleanupHandle(&cp->Pipe[i].Write);
      }
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcessSetupOutputPipeFile(PHANDLE phandle, const char* name)
{
  HANDLE fout;
  if(!name)
    {
    return 1;
    }

  /* Close the existing inherited handle.  */
  kwsysProcessCleanupHandle(phandle);

  /* Create a handle to write a file for the pipe.  */
  fout = CreateFile(name, GENERIC_WRITE, FILE_SHARE_READ, 0,
                    CREATE_ALWAYS, 0, 0);
  if(fout == INVALID_HANDLE_VALUE)
    {
    return 0;
    }

  /* Create an inherited duplicate of the handle.  This also closes
     the non-inherited version.  */
  if(!DuplicateHandle(GetCurrentProcess(), fout,
                      GetCurrentProcess(), &fout,
                      0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                DUPLICATE_SAME_ACCESS)))
    {
    return 0;
    }

  /* Assign the replacement handle.  */
  *phandle = fout;
  return 1;
}

/*--------------------------------------------------------------------------*/
int kwsysProcessSetupSharedPipe(DWORD nStdHandle, PHANDLE handle)
{
  /* Check whether the handle to be shared is already inherited.  */
  DWORD flags;
  int inherited = 0;
  if(GetHandleInformation(GetStdHandle(nStdHandle), &flags) &&
     (flags & HANDLE_FLAG_INHERIT))
    {
    inherited = 1;
    }

  /* Cleanup the previous handle.  */
  kwsysProcessCleanupHandle(handle);

  /* If the standard handle is not inherited then duplicate it to
     create an inherited copy.  Do not close the original handle when
     duplicating!  */
  if(inherited)
    {
    *handle = GetStdHandle(nStdHandle);
    return 1;
    }
  else if(DuplicateHandle(GetCurrentProcess(), GetStdHandle(nStdHandle),
                          GetCurrentProcess(), handle,
                          0, TRUE, DUPLICATE_SAME_ACCESS))
    {
    return 1;
    }
  else
    {
    /* The given standard handle is not valid for this process.  Some
       child processes may break if they do not have a valid standard
       pipe, so give the child an empty pipe.  For the stdin pipe we
       want to close the write end and give the read end to the child.
       For stdout and stderr we want to close the read end and give
       the write end to the child.  */
    int child_end = (nStdHandle == STD_INPUT_HANDLE)? 0:1;
    int parent_end = (nStdHandle == STD_INPUT_HANDLE)? 1:0;
    HANDLE emptyPipe[2];
    if(!CreatePipe(&emptyPipe[0], &emptyPipe[1], 0, 0))
      {
      return 0;
      }

    /* Close the non-inherited end so the pipe will be broken
       immediately.  */
    CloseHandle(emptyPipe[parent_end]);

    /* Create an inherited duplicate of the handle.  This also
       closes the non-inherited version.  */
    if(!DuplicateHandle(GetCurrentProcess(), emptyPipe[child_end],
                        GetCurrentProcess(), &emptyPipe[child_end],
                        0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                  DUPLICATE_SAME_ACCESS)))
      {
      return 0;
      }

    /* Give the inherited handle to the child.  */
    *handle = emptyPipe[child_end];
    return 1;
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcessSetupPipeNative(PHANDLE handle, HANDLE p[2], int isWrite)
{
  /* Close the existing inherited handle.  */
  kwsysProcessCleanupHandle(handle);

  /* Create an inherited duplicate of the handle.  This also closes
     the non-inherited version.  */
  if(!DuplicateHandle(GetCurrentProcess(), p[isWrite? 1:0],
                      GetCurrentProcess(), handle,
                      0, TRUE, (DUPLICATE_CLOSE_SOURCE |
                                DUPLICATE_SAME_ACCESS)))
    {
    return 0;
    }

  return 1;
}

/*--------------------------------------------------------------------------*/

/* Close the given handle if it is open.  Reset its value to 0.  */
void kwsysProcessCleanupHandle(PHANDLE h)
{
  if(h && *h)
    {
    CloseHandle(*h);
    *h = 0;
    }
}

/*--------------------------------------------------------------------------*/

/* Close the given handle if it is open and not a standard handle.
   Reset its value to 0.  */
void kwsysProcessCleanupHandleSafe(PHANDLE h, DWORD nStdHandle)
{
  if(h && *h && (*h != GetStdHandle(nStdHandle)))
    {
    CloseHandle(*h);
    *h = 0;
    }
}

/*--------------------------------------------------------------------------*/

/* Close all handles created by kwsysProcess_Execute.  */
void kwsysProcessCleanup(kwsysProcess* cp, int error)
{
  int i;
  /* If this is an error case, report the error.  */
  if(error)
    {
    /* Construct an error message if one has not been provided already.  */
    if(cp->ErrorMessage[0] == 0)
      {
      /* Format the error message.  */
      DWORD original = GetLastError();
      DWORD length = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
                                   FORMAT_MESSAGE_IGNORE_INSERTS, 0, original,
                                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                                   cp->ErrorMessage, KWSYSPE_PIPE_BUFFER_SIZE, 0);
      if(length < 1)
        {
        /* FormatMessage failed.  Use a default message.  */
        _snprintf(cp->ErrorMessage, KWSYSPE_PIPE_BUFFER_SIZE,
                  "Process execution failed with error 0x%X.  "
                  "FormatMessage failed with error 0x%X",
                  original, GetLastError());
        }
      }

    /* Remove trailing period and newline, if any.  */
    kwsysProcessCleanErrorMessage(cp);

    /* Set the error state.  */
    cp->State = kwsysProcess_State_Error;

    /* Cleanup any processes already started in a suspended state.  */
    if(cp->ProcessInformation)
      {
      if(cp->Win9x)
        {
        SetEvent(cp->Win9xKillEvent);
        }
      else
        {
        for(i=0; i < cp->NumberOfCommands; ++i)
          {
          if(cp->ProcessInformation[i].hProcess)
            {
            TerminateProcess(cp->ProcessInformation[i].hProcess, 255);
            WaitForSingleObject(cp->ProcessInformation[i].hProcess, INFINITE);
            }
          }
        }
      for(i=0; i < cp->NumberOfCommands; ++i)
        {
        kwsysProcessCleanupHandle(&cp->ProcessInformation[i].hThread);
        kwsysProcessCleanupHandle(&cp->ProcessInformation[i].hProcess);
        }
      }

    /* Restore the working directory.  */
    if(cp->RealWorkingDirectory)
      {
      SetCurrentDirectory(cp->RealWorkingDirectory);
      }
    }

  /* Free memory.  */
  if(cp->ProcessInformation)
    {
    free(cp->ProcessInformation);
    cp->ProcessInformation = 0;
    }
  if(cp->ProcessEvents)
    {
    free(cp->ProcessEvents);
    cp->ProcessEvents = 0;
    }
  if(cp->RealWorkingDirectory)
    {
    free(cp->RealWorkingDirectory);
    cp->RealWorkingDirectory = 0;
    }

  /* Close each pipe.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    kwsysProcessCleanupHandle(&cp->Pipe[i].Write);
    kwsysProcessCleanupHandle(&cp->Pipe[i].Read);
    cp->Pipe[i].Closed = 0;
    }
}

/*--------------------------------------------------------------------------*/
void kwsysProcessCleanErrorMessage(kwsysProcess* cp)
{
  /* Remove trailing period and newline, if any.  */
  size_t length = strlen(cp->ErrorMessage);
  if(cp->ErrorMessage[length-1] == '\n')
    {
    cp->ErrorMessage[length-1] = 0;
    --length;
    if(length > 0 && cp->ErrorMessage[length-1] == '\r')
      {
      cp->ErrorMessage[length-1] = 0;
      --length;
      }
    }
  if(length > 0 && cp->ErrorMessage[length-1] == '.')
    {
    cp->ErrorMessage[length-1] = 0;
    }
}

/*--------------------------------------------------------------------------*/
int kwsysProcessComputeCommandLength(kwsysProcess* cp,
                                     char const* const* command)
{
  int length = 0;
  if(cp->Verbatim)
    {
    /* Treat the first argument as a verbatim command line.  Use its
       length directly and add space for the null-terminator.  */
    length = (int)strlen(*command)+1;
    }
  else
    {
    /* Compute the length of the command line when it is converted to
       a single string.  Space for the null-terminator is allocated by
       the whitespace character allocated for the first argument that
       will not be used.  */
    char const* const* arg;
    for(arg = command; *arg; ++arg)
      {
      /* Add the length of this argument.  It already includes room
         for a separating space or terminating null.  */
      length += kwsysSystem_Shell_GetArgumentSizeForWindows(*arg, 0);
      }
    }

  return length;
}

/*--------------------------------------------------------------------------*/
void kwsysProcessComputeCommandLine(kwsysProcess* cp,
                                    char const* const* command,
                                    char* cmd)
{
  if(cp->Verbatim)
    {
    /* Copy the verbatim command line into the buffer.  */
    strcpy(cmd, *command);
    }
  else
    {
    /* Construct the command line in the allocated buffer.  */
    char const* const* arg;
    for(arg = command; *arg; ++arg)
      {
      /* Add the separating space if this is not the first argument.  */
      if(arg != command)
        {
        *cmd++ = ' ';
        }

      /* Add the current argument.  */
      cmd = kwsysSystem_Shell_GetArgumentForWindows(*arg, cmd, 0);
      }

    /* Add the terminating null character to the command line.  */
    *cmd = 0;
    }
}

/*--------------------------------------------------------------------------*/
/* Get the time at which either the process or user timeout will
   expire.  Returns 1 if the user timeout is first, and 0 otherwise.  */
int kwsysProcessGetTimeoutTime(kwsysProcess* cp, double* userTimeout,
                               kwsysProcessTime* timeoutTime)
{
  /* The first time this is called, we need to calculate the time at
     which the child will timeout.  */
  if(cp->Timeout && cp->TimeoutTime.QuadPart < 0)
    {
    kwsysProcessTime length = kwsysProcessTimeFromDouble(cp->Timeout);
    cp->TimeoutTime = kwsysProcessTimeAdd(cp->StartTime, length);
    }

  /* Start with process timeout.  */
  *timeoutTime = cp->TimeoutTime;

  /* Check if the user timeout is earlier.  */
  if(userTimeout)
    {
    kwsysProcessTime currentTime = kwsysProcessTimeGetCurrent();
    kwsysProcessTime userTimeoutLength = kwsysProcessTimeFromDouble(*userTimeout);
    kwsysProcessTime userTimeoutTime = kwsysProcessTimeAdd(currentTime,
                                                           userTimeoutLength);
    if(timeoutTime->QuadPart < 0 ||
       kwsysProcessTimeLess(userTimeoutTime, *timeoutTime))
      {
      *timeoutTime = userTimeoutTime;
      return 1;
      }
    }
  return 0;
}

/*--------------------------------------------------------------------------*/
/* Get the length of time before the given timeout time arrives.
   Returns 1 if the time has already arrived, and 0 otherwise.  */
int kwsysProcessGetTimeoutLeft(kwsysProcessTime* timeoutTime,
                               double* userTimeout,
                               kwsysProcessTime* timeoutLength)
{
  if(timeoutTime->QuadPart < 0)
    {
    /* No timeout time has been requested.  */
    return 0;
    }
  else
    {
    /* Calculate the remaining time.  */
    kwsysProcessTime currentTime = kwsysProcessTimeGetCurrent();
    *timeoutLength = kwsysProcessTimeSubtract(*timeoutTime, currentTime);

    if(timeoutLength->QuadPart < 0 && userTimeout && *userTimeout <= 0)
      {
      /* Caller has explicitly requested a zero timeout.  */
      timeoutLength->QuadPart = 0;
      }

    if(timeoutLength->QuadPart < 0)
      {
      /* Timeout has already expired.  */
      return 1;
      }
    else
      {
      /* There is some time left.  */
      return 0;
      }
    }
}

/*--------------------------------------------------------------------------*/
kwsysProcessTime kwsysProcessTimeGetCurrent()
{
  kwsysProcessTime current;
  FILETIME ft;
  GetSystemTimeAsFileTime(&ft);
  current.LowPart = ft.dwLowDateTime;
  current.HighPart = ft.dwHighDateTime;
  return current;
}

/*--------------------------------------------------------------------------*/
DWORD kwsysProcessTimeToDWORD(kwsysProcessTime t)
{
  return (DWORD)(t.QuadPart * 0.0001);
}

/*--------------------------------------------------------------------------*/
double kwsysProcessTimeToDouble(kwsysProcessTime t)
{
  return t.QuadPart * 0.0000001;
}

/*--------------------------------------------------------------------------*/
kwsysProcessTime kwsysProcessTimeFromDouble(double d)
{
  kwsysProcessTime t;
  t.QuadPart = (LONGLONG)(d*10000000);
  return t;
}

/*--------------------------------------------------------------------------*/
int kwsysProcessTimeLess(kwsysProcessTime in1, kwsysProcessTime in2)
{
  return in1.QuadPart < in2.QuadPart;
}

/*--------------------------------------------------------------------------*/
kwsysProcessTime kwsysProcessTimeAdd(kwsysProcessTime in1, kwsysProcessTime in2)
{
  kwsysProcessTime out;
  out.QuadPart = in1.QuadPart + in2.QuadPart;
  return out;
}

/*--------------------------------------------------------------------------*/
kwsysProcessTime kwsysProcessTimeSubtract(kwsysProcessTime in1, kwsysProcessTime in2)
{
  kwsysProcessTime out;
  out.QuadPart = in1.QuadPart - in2.QuadPart;
  return out;
}

/*--------------------------------------------------------------------------*/
#define KWSYSPE_CASE(type, str) \
  cp->ExitException = kwsysProcess_Exception_##type; \
  strcpy(cp->ExitExceptionString, str)
static void kwsysProcessSetExitException(kwsysProcess* cp, int code)
{
  switch (code)
    {
    case STATUS_CONTROL_C_EXIT:
      KWSYSPE_CASE(Interrupt, "User interrupt"); break;

    case STATUS_FLOAT_DENORMAL_OPERAND:
      KWSYSPE_CASE(Numerical, "Floating-point exception (denormal operand)"); break;
    case STATUS_FLOAT_DIVIDE_BY_ZERO:
      KWSYSPE_CASE(Numerical, "Divide-by-zero"); break;
    case STATUS_FLOAT_INEXACT_RESULT:
      KWSYSPE_CASE(Numerical, "Floating-point exception (inexact result)"); break;
    case STATUS_FLOAT_INVALID_OPERATION:
      KWSYSPE_CASE(Numerical, "Invalid floating-point operation"); break;
    case STATUS_FLOAT_OVERFLOW:
      KWSYSPE_CASE(Numerical, "Floating-point overflow"); break;
    case STATUS_FLOAT_STACK_CHECK:
      KWSYSPE_CASE(Numerical, "Floating-point stack check failed"); break;
    case STATUS_FLOAT_UNDERFLOW:
      KWSYSPE_CASE(Numerical, "Floating-point underflow"); break;
#ifdef STATUS_FLOAT_MULTIPLE_FAULTS
    case STATUS_FLOAT_MULTIPLE_FAULTS:
      KWSYSPE_CASE(Numerical, "Floating-point exception (multiple faults)"); break;
#endif
#ifdef STATUS_FLOAT_MULTIPLE_TRAPS
    case STATUS_FLOAT_MULTIPLE_TRAPS:
      KWSYSPE_CASE(Numerical, "Floating-point exception (multiple traps)"); break;
#endif
    case STATUS_INTEGER_DIVIDE_BY_ZERO:
      KWSYSPE_CASE(Numerical, "Integer divide-by-zero"); break;
    case STATUS_INTEGER_OVERFLOW:
      KWSYSPE_CASE(Numerical, "Integer overflow"); break;

    case STATUS_DATATYPE_MISALIGNMENT:
      KWSYSPE_CASE(Fault, "Datatype misalignment"); break;
    case STATUS_ACCESS_VIOLATION:
      KWSYSPE_CASE(Fault, "Access violation"); break;
    case STATUS_IN_PAGE_ERROR:
      KWSYSPE_CASE(Fault, "In-page error"); break;
    case STATUS_INVALID_HANDLE:
      KWSYSPE_CASE(Fault, "Invalid hanlde"); break;
    case STATUS_NONCONTINUABLE_EXCEPTION:
      KWSYSPE_CASE(Fault, "Noncontinuable exception"); break;
    case STATUS_INVALID_DISPOSITION:
      KWSYSPE_CASE(Fault, "Invalid disposition"); break;
    case STATUS_ARRAY_BOUNDS_EXCEEDED:
      KWSYSPE_CASE(Fault, "Array bounds exceeded"); break;
    case STATUS_STACK_OVERFLOW:
      KWSYSPE_CASE(Fault, "Stack overflow"); break;

    case STATUS_ILLEGAL_INSTRUCTION:
      KWSYSPE_CASE(Illegal, "Illegal instruction"); break;
    case STATUS_PRIVILEGED_INSTRUCTION:
      KWSYSPE_CASE(Illegal, "Privileged instruction"); break;

    case STATUS_NO_MEMORY:
    default:
      cp->ExitException = kwsysProcess_Exception_Other;
      sprintf(cp->ExitExceptionString, "Exit code 0x%x\n", code);
      break;
    }
}
#undef KWSYSPE_CASE

typedef struct kwsysProcess_List_s kwsysProcess_List;
static kwsysProcess_List* kwsysProcess_List_New(void);
static void kwsysProcess_List_Delete(kwsysProcess_List* self);
static int kwsysProcess_List_Update(kwsysProcess_List* self);
static int kwsysProcess_List_NextProcess(kwsysProcess_List* self);
static int kwsysProcess_List_GetCurrentProcessId(kwsysProcess_List* self);
static int kwsysProcess_List_GetCurrentParentId(kwsysProcess_List* self);

/*--------------------------------------------------------------------------*/
/* Windows NT 4 API definitions.  */
#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)
typedef LONG NTSTATUS;
typedef LONG KPRIORITY;
typedef struct _UNICODE_STRING UNICODE_STRING;
struct _UNICODE_STRING
{
  USHORT Length;
  USHORT MaximumLength;
  PWSTR Buffer;
};

/* The process information structure.  Declare only enough to get
   process identifiers.  The rest may be ignored because we use the
   NextEntryDelta to move through an array of instances.  */
typedef struct _SYSTEM_PROCESS_INFORMATION SYSTEM_PROCESS_INFORMATION;
typedef SYSTEM_PROCESS_INFORMATION* PSYSTEM_PROCESS_INFORMATION;
struct _SYSTEM_PROCESS_INFORMATION
{
  ULONG          NextEntryDelta;
  ULONG          ThreadCount;
  ULONG          Reserved1[6];
  LARGE_INTEGER  CreateTime;
  LARGE_INTEGER  UserTime;
  LARGE_INTEGER  KernelTime;
  UNICODE_STRING ProcessName;
  KPRIORITY      BasePriority;
  ULONG          ProcessId;
  ULONG          InheritedFromProcessId;
};

/*--------------------------------------------------------------------------*/
/* Toolhelp32 API definitions.  */
#define TH32CS_SNAPPROCESS  0x00000002
#if defined(_WIN64)
typedef unsigned __int64 ProcessULONG_PTR;
#else
typedef unsigned long ProcessULONG_PTR;
#endif
typedef struct tagPROCESSENTRY32 PROCESSENTRY32;
typedef PROCESSENTRY32* LPPROCESSENTRY32;
struct tagPROCESSENTRY32
{
  DWORD dwSize;
  DWORD cntUsage;
  DWORD th32ProcessID;
  ProcessULONG_PTR th32DefaultHeapID;
  DWORD th32ModuleID;
  DWORD cntThreads;
  DWORD th32ParentProcessID;
  LONG  pcPriClassBase;
  DWORD dwFlags;
  char szExeFile[MAX_PATH];
};

/*--------------------------------------------------------------------------*/
/* Windows API function types.  */
typedef HANDLE (WINAPI* CreateToolhelp32SnapshotType)(DWORD, DWORD);
typedef BOOL (WINAPI* Process32FirstType)(HANDLE, LPPROCESSENTRY32);
typedef BOOL (WINAPI* Process32NextType)(HANDLE, LPPROCESSENTRY32);
typedef NTSTATUS (WINAPI* ZwQuerySystemInformationType)(ULONG, PVOID,
                                                        ULONG, PULONG);


/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__New_NT4(kwsysProcess_List* self);
static int kwsysProcess_List__New_Snapshot(kwsysProcess_List* self);
static void kwsysProcess_List__Delete_NT4(kwsysProcess_List* self);
static void kwsysProcess_List__Delete_Snapshot(kwsysProcess_List* self);
static int kwsysProcess_List__Update_NT4(kwsysProcess_List* self);
static int kwsysProcess_List__Update_Snapshot(kwsysProcess_List* self);
static int kwsysProcess_List__Next_NT4(kwsysProcess_List* self);
static int kwsysProcess_List__Next_Snapshot(kwsysProcess_List* self);
static int kwsysProcess_List__GetProcessId_NT4(kwsysProcess_List* self);
static int kwsysProcess_List__GetProcessId_Snapshot(kwsysProcess_List* self);
static int kwsysProcess_List__GetParentId_NT4(kwsysProcess_List* self);
static int kwsysProcess_List__GetParentId_Snapshot(kwsysProcess_List* self);

struct kwsysProcess_List_s
{
  /* Implementation switches at runtime based on version of Windows.  */
  int NT4;

  /* Implementation functions and data for NT 4.  */
  ZwQuerySystemInformationType P_ZwQuerySystemInformation;
  char* Buffer;
  int BufferSize;
  PSYSTEM_PROCESS_INFORMATION CurrentInfo;

  /* Implementation functions and data for other Windows versions.  */
  CreateToolhelp32SnapshotType P_CreateToolhelp32Snapshot;
  Process32FirstType P_Process32First;
  Process32NextType P_Process32Next;
  HANDLE Snapshot;
  PROCESSENTRY32 CurrentEntry;
};

/*--------------------------------------------------------------------------*/
static kwsysProcess_List* kwsysProcess_List_New(void)
{
  OSVERSIONINFO osv;
  kwsysProcess_List* self;

  /* Allocate and initialize the list object.  */
  if(!(self = (kwsysProcess_List*)malloc(sizeof(kwsysProcess_List))))
    {
    return 0;
    }
  memset(self, 0, sizeof(*self));

  /* Select an implementation.  */
  ZeroMemory(&osv, sizeof(osv));
  osv.dwOSVersionInfoSize = sizeof(osv);
  GetVersionEx(&osv);
  self->NT4 = (osv.dwPlatformId == VER_PLATFORM_WIN32_NT &&
               osv.dwMajorVersion < 5)? 1:0;

  /* Initialize the selected implementation.  */
  if(!(self->NT4?
       kwsysProcess_List__New_NT4(self) :
       kwsysProcess_List__New_Snapshot(self)))
    {
    kwsysProcess_List_Delete(self);
    return 0;
    }

  /* Update to the current set of processes.  */
  if(!kwsysProcess_List_Update(self))
    {
    kwsysProcess_List_Delete(self);
    return 0;
    }
  return self;
}

/*--------------------------------------------------------------------------*/
static void kwsysProcess_List_Delete(kwsysProcess_List* self)
{
  if(self)
    {
    if(self->NT4)
      {
      kwsysProcess_List__Delete_NT4(self);
      }
    else
      {
      kwsysProcess_List__Delete_Snapshot(self);
      }
    free(self);
    }
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List_Update(kwsysProcess_List* self)
{
  return self? (self->NT4?
                kwsysProcess_List__Update_NT4(self) :
                kwsysProcess_List__Update_Snapshot(self)) : 0;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List_GetCurrentProcessId(kwsysProcess_List* self)
{
  return self? (self->NT4?
                kwsysProcess_List__GetProcessId_NT4(self) :
                kwsysProcess_List__GetProcessId_Snapshot(self)) : -1;

}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List_GetCurrentParentId(kwsysProcess_List* self)
{
  return self? (self->NT4?
                kwsysProcess_List__GetParentId_NT4(self) :
                kwsysProcess_List__GetParentId_Snapshot(self)) : -1;

}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List_NextProcess(kwsysProcess_List* self)
{
  return (self? (self->NT4?
                 kwsysProcess_List__Next_NT4(self) :
                 kwsysProcess_List__Next_Snapshot(self)) : 0);
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__New_NT4(kwsysProcess_List* self)
{
  /* Get a handle to the NT runtime module that should already be
     loaded in this program.  This does not actually increment the
     reference count to the module so we do not need to close the
     handle.  */
  HMODULE hNT = GetModuleHandle("ntdll.dll");
  if(hNT)
    {
    /* Get pointers to the needed API functions.  */
    self->P_ZwQuerySystemInformation =
      ((ZwQuerySystemInformationType)
       GetProcAddress(hNT, "ZwQuerySystemInformation"));
    }
  if(!self->P_ZwQuerySystemInformation)
    {
    return 0;
    }

  /* Allocate an initial process information buffer.  */
  self->BufferSize = 32768;
  self->Buffer = (char*)malloc(self->BufferSize);
  return self->Buffer? 1:0;
}

/*--------------------------------------------------------------------------*/
static void kwsysProcess_List__Delete_NT4(kwsysProcess_List* self)
{
  /* Free the process information buffer.  */
  if(self->Buffer)
    {
    free(self->Buffer);
    }
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__Update_NT4(kwsysProcess_List* self)
{
  self->CurrentInfo = 0;
  for(;;)
    {
    /* Query number 5 is for system process list.  */
    NTSTATUS status =
      self->P_ZwQuerySystemInformation(5, self->Buffer, self->BufferSize, 0);
    if(status == STATUS_INFO_LENGTH_MISMATCH)
      {
      /* The query requires a bigger buffer.  */
      int newBufferSize = self->BufferSize * 2;
      char* newBuffer = (char*)malloc(newBufferSize);
      if(newBuffer)
        {
        free(self->Buffer);
        self->Buffer = newBuffer;
        self->BufferSize = newBufferSize;
        }
      else
        {
        return 0;
        }
      }
    else if(status >= 0)
      {
      /* The query succeeded.  Initialize traversal of the process list.  */
      self->CurrentInfo = (PSYSTEM_PROCESS_INFORMATION)self->Buffer;
      return 1;
      }
    else
      {
      /* The query failed.  */
      return 0;
      }
    }
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__Next_NT4(kwsysProcess_List* self)
{
  if(self->CurrentInfo)
    {
    if(self->CurrentInfo->NextEntryDelta > 0)
      {
      self->CurrentInfo = ((PSYSTEM_PROCESS_INFORMATION)
                              ((char*)self->CurrentInfo +
                               self->CurrentInfo->NextEntryDelta));
      return 1;
      }
    self->CurrentInfo = 0;
    }
  return 0;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__GetProcessId_NT4(kwsysProcess_List* self)
{
  return self->CurrentInfo? self->CurrentInfo->ProcessId : -1;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__GetParentId_NT4(kwsysProcess_List* self)
{
  return self->CurrentInfo? self->CurrentInfo->InheritedFromProcessId : -1;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__New_Snapshot(kwsysProcess_List* self)
{
  /* Get a handle to the Windows runtime module that should already be
     loaded in this program.  This does not actually increment the
     reference count to the module so we do not need to close the
     handle.  */
  HMODULE hKernel = GetModuleHandle("kernel32.dll");
  if(hKernel)
    {
    self->P_CreateToolhelp32Snapshot =
      ((CreateToolhelp32SnapshotType)
       GetProcAddress(hKernel, "CreateToolhelp32Snapshot"));
    self->P_Process32First =
      ((Process32FirstType)
       GetProcAddress(hKernel, "Process32First"));
    self->P_Process32Next =
      ((Process32NextType)
       GetProcAddress(hKernel, "Process32Next"));
    }
  return (self->P_CreateToolhelp32Snapshot &&
          self->P_Process32First &&
          self->P_Process32Next)? 1:0;
}

/*--------------------------------------------------------------------------*/
static void kwsysProcess_List__Delete_Snapshot(kwsysProcess_List* self)
{
  if(self->Snapshot)
    {
    CloseHandle(self->Snapshot);
    }
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__Update_Snapshot(kwsysProcess_List* self)
{
  if(self->Snapshot)
    {
    CloseHandle(self->Snapshot);
    }
  if(!(self->Snapshot =
       self->P_CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)))
    {
    return 0;
    }
  ZeroMemory(&self->CurrentEntry, sizeof(self->CurrentEntry));
  self->CurrentEntry.dwSize = sizeof(self->CurrentEntry);
  if(!self->P_Process32First(self->Snapshot, &self->CurrentEntry))
    {
    CloseHandle(self->Snapshot);
    self->Snapshot = 0;
    return 0;
    }
  return 1;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__Next_Snapshot(kwsysProcess_List* self)
{
  if(self->Snapshot)
    {
    if(self->P_Process32Next(self->Snapshot, &self->CurrentEntry))
      {
      return 1;
      }
    CloseHandle(self->Snapshot);
    self->Snapshot = 0;
    }
  return 0;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__GetProcessId_Snapshot(kwsysProcess_List* self)
{
  return self->Snapshot? self->CurrentEntry.th32ProcessID : -1;
}

/*--------------------------------------------------------------------------*/
static int kwsysProcess_List__GetParentId_Snapshot(kwsysProcess_List* self)
{
  return self->Snapshot? self->CurrentEntry.th32ParentProcessID : -1;
}

/*--------------------------------------------------------------------------*/
static void kwsysProcessKill(DWORD pid)
{
  HANDLE h = OpenProcess(PROCESS_TERMINATE, 0, pid);
  if(h)
    {
    TerminateProcess(h, 255);
    WaitForSingleObject(h, INFINITE);
    CloseHandle(h);
    }
}

/*--------------------------------------------------------------------------*/
static void kwsysProcessKillTree(int pid)
{
  kwsysProcess_List* plist = kwsysProcess_List_New();
  kwsysProcessKill(pid);
  if(plist)
    {
    do
      {
      if(kwsysProcess_List_GetCurrentParentId(plist) == pid)
        {
        int ppid = kwsysProcess_List_GetCurrentProcessId(plist);
        kwsysProcessKillTree(ppid);
        }
      } while(kwsysProcess_List_NextProcess(plist));
    kwsysProcess_List_Delete(plist);
    }
}

/*--------------------------------------------------------------------------*/
static void kwsysProcessDisablePipeThreads(kwsysProcess* cp)
{
  int i;

  /* If data were just reported data, release the pipe's thread.  */
  if(cp->CurrentIndex < KWSYSPE_PIPE_COUNT)
    {
    KWSYSPE_DEBUG((stderr, "releasing reader %d\n", cp->CurrentIndex));
    ReleaseSemaphore(cp->Pipe[cp->CurrentIndex].Reader.Go, 1, 0);
    cp->CurrentIndex = KWSYSPE_PIPE_COUNT;
    }

  /* Wakeup all reading threads that are not on closed pipes.  */
  for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
    {
    /* The wakeup threads will write one byte to the pipe write ends.
       If there are no data in the pipe then this is enough to wakeup
       the reading threads.  If there are already data in the pipe
       this may block.  We cannot use PeekNamedPipe to check whether
       there are data because an outside process might still be
       writing data if we are disowning it.  Also, PeekNamedPipe will
       block if checking a pipe on which the reading thread is
       currently calling ReadPipe.  Therefore we need a separate
       thread to call WriteFile.  If it blocks, that is okay because
       it will unblock when we close the read end and break the pipe
       below.  */
    if(cp->Pipe[i].Read)
      {
      KWSYSPE_DEBUG((stderr, "releasing waker %d\n", i));
      ReleaseSemaphore(cp->Pipe[i].Waker.Go, 1, 0);
      }
    }

  /* Tell pipe threads to reset until we run another process.  */
  while(cp->PipesLeft > 0)
    {
    /* The waking threads will cause all reading threads to report.
       Wait for the next one and save its index.  */
    KWSYSPE_DEBUG((stderr, "waiting for reader\n"));
    WaitForSingleObject(cp->Full, INFINITE);
    cp->CurrentIndex = cp->SharedIndex;
    ReleaseSemaphore(cp->SharedIndexMutex, 1, 0);
    KWSYSPE_DEBUG((stderr, "got reader %d\n", cp->CurrentIndex));

    /* We are done reading this pipe.  Close its read handle.  */
    cp->Pipe[cp->CurrentIndex].Closed = 1;
    kwsysProcessCleanupHandle(&cp->Pipe[cp->CurrentIndex].Read);
    --cp->PipesLeft;

    /* Tell the reading thread we are done with the data.  It will
       reset immediately because the pipe is closed.  */
    ReleaseSemaphore(cp->Pipe[cp->CurrentIndex].Reader.Go, 1, 0);
    }
}