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
|
/*
* Copyright (c) 2005 Christophe Varoqui
* Copyright (c) 2005 Benjamin Marzinski, Redhat
* Copyright (c) 2005 Jun'ichi Nomura, NEC
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include "memory.h"
#include "log.h"
#define ALIGN(len, s) (((len)+(s)-1)/(s)*(s))
#if LOGDBG
static void dump_logarea (void)
{
struct logmsg * msg;
logdbg(stderr, "\n==== area: start addr = %p, end addr = %p ====\n",
la->start, la->end);
logdbg(stderr, "|addr |next |prio|msg\n");
for (msg = (struct logmsg *)la->head; (void *)msg != la->tail;
msg = msg->next)
logdbg(stderr, "|%p |%p |%i |%s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
logdbg(stderr, "|%p |%p |%i |%s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
logdbg(stderr, "\n\n");
}
#endif
static int logarea_init (int size)
{
logdbg(stderr,"enter logarea_init\n");
la = (struct logarea *)MALLOC(sizeof(struct logarea));
if (!la)
return 1;
if (size < MAX_MSG_SIZE)
size = DEFAULT_AREA_SIZE;
la->start = MALLOC(size);
if (!la->start) {
FREE(la);
return 1;
}
memset(la->start, 0, size);
la->empty = 1;
la->end = la->start + size;
la->head = la->start;
la->tail = la->start;
la->buff = MALLOC(MAX_MSG_SIZE + sizeof(struct logmsg));
if (!la->buff) {
FREE(la->start);
FREE(la);
return 1;
}
return 0;
}
int log_init(char *program_name, int size)
{
logdbg(stderr,"enter log_init\n");
openlog(program_name, 0, LOG_DAEMON);
if (logarea_init(size))
return 1;
return 0;
}
void free_logarea (void)
{
FREE(la->start);
FREE(la->buff);
FREE(la);
return;
}
void log_close (void)
{
free_logarea();
closelog();
return;
}
int log_enqueue (int prio, const char * fmt, va_list ap)
{
int len, fwd;
char buff[MAX_MSG_SIZE];
struct logmsg * msg;
struct logmsg * lastmsg;
lastmsg = (struct logmsg *)la->tail;
if (!la->empty) {
fwd = sizeof(struct logmsg) +
strlen((char *)&lastmsg->str) * sizeof(char) + 1;
la->tail += ALIGN(fwd, sizeof(void *));
}
vsnprintf(buff, MAX_MSG_SIZE, fmt, ap);
len = ALIGN(sizeof(struct logmsg) + strlen(buff) * sizeof(char) + 1,
sizeof(void *));
/* not enough space on tail : rewind */
if (la->head <= la->tail && len > (la->end - la->tail)) {
logdbg(stderr, "enqueue: rewind tail to %p\n", la->tail);
if (la->head == la->start ) {
logdbg(stderr, "enqueue: can not rewind tail, drop msg\n");
la->tail = lastmsg;
return 1; /* can't reuse */
}
la->tail = la->start;
if (la->empty)
la->head = la->start;
}
/* not enough space on head : drop msg */
if (la->head > la->tail && len >= (la->head - la->tail)) {
logdbg(stderr, "enqueue: log area overrun, drop msg\n");
if (!la->empty)
la->tail = lastmsg;
return 1;
}
/* ok, we can stage the msg in the area */
la->empty = 0;
msg = (struct logmsg *)la->tail;
msg->prio = prio;
strcpy((void *)&msg->str, buff);
lastmsg->next = la->tail;
msg->next = la->head;
logdbg(stderr, "enqueue: %p, %p, %i, %s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
#if LOGDBG
dump_logarea();
#endif
return 0;
}
int log_dequeue (void * buff)
{
struct logmsg * src = (struct logmsg *)la->head;
struct logmsg * dst = (struct logmsg *)buff;
struct logmsg * lst = (struct logmsg *)la->tail;
if (la->empty)
return 1;
int len = strlen((char *)&src->str) * sizeof(char) +
sizeof(struct logmsg) + 1;
dst->prio = src->prio;
memcpy(dst, src, len);
if (la->tail == la->head)
la->empty = 1; /* we purge the last logmsg */
else {
la->head = src->next;
lst->next = la->head;
}
logdbg(stderr, "dequeue: %p, %p, %i, %s\n",
(void *)src, src->next, src->prio, (char *)&src->str);
memset((void *)src, 0, len);
return 0;
}
/*
* this one can block under memory pressure
*/
void log_syslog (void * buff)
{
struct logmsg * msg = (struct logmsg *)buff;
syslog(msg->prio, "%s", (char *)&msg->str);
}
|
