monitor: Rework API (Jan Kiszka)

Refactor the monitor API and prepare it for decoupled terminals:
term_print functions are renamed to monitor_* and all monitor services
gain a new parameter (mon) that will once refer to the monitor instance
the output is supposed to appear on. However, the argument remains
unused for now. All monitor command callbacks are also extended by a mon
parameter so that command handlers are able to pass an appropriate
reference to monitor output services.

For the case that monitor outputs so far happen without clearly
identifiable context, the global variable cur_mon is introduced that
shall once provide a pointer either to the current active monitor (while
processing commands) or to the default one. On the mid or long term,
those use case will be obsoleted so that this variable can be removed
again.

Due to the broad usage of the monitor interface, this patch mostly deals
with converting users of the monitor API. A few of them are already
extended to pass 'mon' from the command handler further down to internal
functions that invoke monitor_printf.

At this chance, monitor-related prototypes are moved from console.h to
a new monitor.h. The same is done for the readline API.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6711 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 44 insertions, 39 deletions

diff --git a/savevm.c b/savevm.c
index 3eb2000ab2..bea6885b3d 100644
--- a/savevm.c
+++ b/savevm.c
@@ -24,7 +24,7 @@
 #include "qemu-common.h"
 #include "hw/hw.h"
 #include "net.h"
-#include "console.h"
+#include "monitor.h"
 #include "sysemu.h"
 #include "qemu-timer.h"
 #include "qemu-char.h"
@@ -993,7 +993,7 @@ static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
     return ret;
 }
 
-void do_savevm(const char *name)
+void do_savevm(Monitor *mon, const char *name)
 {
     BlockDriverState *bs, *bs1;
     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
@@ -1010,7 +1010,7 @@ void do_savevm(const char *name)
 
     bs = get_bs_snapshots();
     if (!bs) {
-        term_printf("No block device can accept snapshots\n");
+        monitor_printf(mon, "No block device can accept snapshots\n");
         return;
     }
 
@@ -1049,22 +1049,22 @@ void do_savevm(const char *name)
     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
 
     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
-        term_printf("Device %s does not support VM state snapshots\n",
-                    bdrv_get_device_name(bs));
+        monitor_printf(mon, "Device %s does not support VM state snapshots\n",
+                       bdrv_get_device_name(bs));
         goto the_end;
     }
 
     /* save the VM state */
     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 1);
     if (!f) {
-        term_printf("Could not open VM state file\n");
+        monitor_printf(mon, "Could not open VM state file\n");
         goto the_end;
     }
     ret = qemu_savevm_state(f);
     vm_state_size = qemu_ftell(f);
     qemu_fclose(f);
     if (ret < 0) {
-        term_printf("Error %d while writing VM\n", ret);
+        monitor_printf(mon, "Error %d while writing VM\n", ret);
         goto the_end;
     }
 
@@ -1076,16 +1076,17 @@ void do_savevm(const char *name)
             if (must_delete) {
                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
                 if (ret < 0) {
-                    term_printf("Error while deleting snapshot on '%s'\n",
-                                bdrv_get_device_name(bs1));
+                    monitor_printf(mon,
+                                   "Error while deleting snapshot on '%s'\n",
+                                   bdrv_get_device_name(bs1));
                 }
             }
             /* Write VM state size only to the image that contains the state */
             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
             ret = bdrv_snapshot_create(bs1, sn);
             if (ret < 0) {
-                term_printf("Error while creating snapshot on '%s'\n",
-                            bdrv_get_device_name(bs1));
+                monitor_printf(mon, "Error while creating snapshot on '%s'\n",
+                               bdrv_get_device_name(bs1));
             }
         }
     }
@@ -1095,7 +1096,7 @@ void do_savevm(const char *name)
         vm_start();
 }
 
-void do_loadvm(const char *name)
+void do_loadvm(Monitor *mon, const char *name)
 {
     BlockDriverState *bs, *bs1;
     BlockDriverInfo bdi1, *bdi = &bdi1;
@@ -1106,7 +1107,7 @@ void do_loadvm(const char *name)
 
     bs = get_bs_snapshots();
     if (!bs) {
-        term_printf("No block device supports snapshots\n");
+        monitor_printf(mon, "No block device supports snapshots\n");
         return;
     }
 
@@ -1122,19 +1123,21 @@ void do_loadvm(const char *name)
             ret = bdrv_snapshot_goto(bs1, name);
             if (ret < 0) {
                 if (bs != bs1)
-                    term_printf("Warning: ");
+                    monitor_printf(mon, "Warning: ");
                 switch(ret) {
                 case -ENOTSUP:
-                    term_printf("Snapshots not supported on device '%s'\n",
-                                bdrv_get_device_name(bs1));
+                    monitor_printf(mon,
+                                   "Snapshots not supported on device '%s'\n",
+                                   bdrv_get_device_name(bs1));
                     break;
                 case -ENOENT:
-                    term_printf("Could not find snapshot '%s' on device '%s'\n",
-                                name, bdrv_get_device_name(bs1));
+                    monitor_printf(mon, "Could not find snapshot '%s' on "
+                                   "device '%s'\n",
+                                   name, bdrv_get_device_name(bs1));
                     break;
                 default:
-                    term_printf("Error %d while activating snapshot on '%s'\n",
-                                ret, bdrv_get_device_name(bs1));
+                    monitor_printf(mon, "Error %d while activating snapshot on"
+                                   " '%s'\n", ret, bdrv_get_device_name(bs1));
                     break;
                 }
                 /* fatal on snapshot block device */
@@ -1145,8 +1148,8 @@ void do_loadvm(const char *name)
     }
 
     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
-        term_printf("Device %s does not support VM state snapshots\n",
-                    bdrv_get_device_name(bs));
+        monitor_printf(mon, "Device %s does not support VM state snapshots\n",
+                       bdrv_get_device_name(bs));
         return;
     }
 
@@ -1158,27 +1161,27 @@ void do_loadvm(const char *name)
     /* restore the VM state */
     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 0);
     if (!f) {
-        term_printf("Could not open VM state file\n");
+        monitor_printf(mon, "Could not open VM state file\n");
         goto the_end;
     }
     ret = qemu_loadvm_state(f);
     qemu_fclose(f);
     if (ret < 0) {
-        term_printf("Error %d while loading VM state\n", ret);
+        monitor_printf(mon, "Error %d while loading VM state\n", ret);
     }
  the_end:
     if (saved_vm_running)
         vm_start();
 }
 
-void do_delvm(const char *name)
+void do_delvm(Monitor *mon, const char *name)
 {
     BlockDriverState *bs, *bs1;
     int i, ret;
 
     bs = get_bs_snapshots();
     if (!bs) {
-        term_printf("No block device supports snapshots\n");
+        monitor_printf(mon, "No block device supports snapshots\n");
         return;
     }
 
@@ -1188,17 +1191,18 @@ void do_delvm(const char *name)
             ret = bdrv_snapshot_delete(bs1, name);
             if (ret < 0) {
                 if (ret == -ENOTSUP)
-                    term_printf("Snapshots not supported on device '%s'\n",
-                                bdrv_get_device_name(bs1));
+                    monitor_printf(mon,
+                                   "Snapshots not supported on device '%s'\n",
+                                   bdrv_get_device_name(bs1));
                 else
-                    term_printf("Error %d while deleting snapshot on '%s'\n",
-                                ret, bdrv_get_device_name(bs1));
+                    monitor_printf(mon, "Error %d while deleting snapshot on "
+                                   "'%s'\n", ret, bdrv_get_device_name(bs1));
             }
         }
     }
 }
 
-void do_info_snapshots(void)
+void do_info_snapshots(Monitor *mon)
 {
     BlockDriverState *bs, *bs1;
     QEMUSnapshotInfo *sn_tab, *sn;
@@ -1207,29 +1211,30 @@ void do_info_snapshots(void)
 
     bs = get_bs_snapshots();
     if (!bs) {
-        term_printf("No available block device supports snapshots\n");
+        monitor_printf(mon, "No available block device supports snapshots\n");
         return;
     }
-    term_printf("Snapshot devices:");
+    monitor_printf(mon, "Snapshot devices:");
     for(i = 0; i <= nb_drives; i++) {
         bs1 = drives_table[i].bdrv;
         if (bdrv_has_snapshot(bs1)) {
             if (bs == bs1)
-                term_printf(" %s", bdrv_get_device_name(bs1));
+                monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
         }
     }
-    term_printf("\n");
+    monitor_printf(mon, "\n");
 
     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
     if (nb_sns < 0) {
-        term_printf("bdrv_snapshot_list: error %d\n", nb_sns);
+        monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
         return;
     }
-    term_printf("Snapshot list (from %s):\n", bdrv_get_device_name(bs));
-    term_printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
+    monitor_printf(mon, "Snapshot list (from %s):\n",
+                   bdrv_get_device_name(bs));
+    monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
     for(i = 0; i < nb_sns; i++) {
         sn = &sn_tab[i];
-        term_printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
+        monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
     }
     qemu_free(sn_tab);
 }