-
Notifications
You must be signed in to change notification settings - Fork 16
/
ulog.c
191 lines (155 loc) · 3.83 KB
/
ulog.c
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
/*
* ulog - simple logging functions
*
* Copyright (C) 2015 Jo-Philipp Wich <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ulog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
static int _ulog_channels = -1;
static int _ulog_facility = -1;
static int _ulog_threshold = LOG_DEBUG;
static int _ulog_initialized = 0;
static const char *_ulog_ident = NULL;
static struct udebug_buf *udb = NULL;
static const char *ulog_default_ident(void)
{
FILE *self;
static char line[64];
char *p = NULL;
char *sbuf;
if ((self = fopen("/proc/self/status", "r")) != NULL) {
while (fgets(line, sizeof(line), self)) {
if (!strncmp(line, "Name:", 5)) {
strtok_r(line, "\t\n", &sbuf);
p = strtok_r(NULL, "\t\n", &sbuf);
break;
}
}
fclose(self);
}
return p;
}
static void ulog_defaults(void)
{
char *env;
if (_ulog_initialized)
return;
env = getenv("PREINIT");
if (_ulog_channels < 0) {
if (env && !strcmp(env, "1"))
_ulog_channels = ULOG_KMSG;
else if (isatty(1))
_ulog_channels = ULOG_STDIO;
else
_ulog_channels = ULOG_SYSLOG;
}
if (_ulog_facility < 0) {
if (env && !strcmp(env, "1"))
_ulog_facility = LOG_DAEMON;
else if (isatty(1))
_ulog_facility = LOG_USER;
else
_ulog_facility = LOG_DAEMON;
}
if (_ulog_ident == NULL && _ulog_channels != ULOG_STDIO)
_ulog_ident = ulog_default_ident();
if (_ulog_channels & ULOG_SYSLOG)
openlog(_ulog_ident, 0, _ulog_facility);
_ulog_initialized = 1;
}
__attribute__((format(printf, 2, 0)))
static void ulog_kmsg(int priority, const char *fmt, va_list ap)
{
FILE *kmsg;
if ((kmsg = fopen("/dev/kmsg", "r+")) != NULL) {
fprintf(kmsg, "<%u>", priority);
if (_ulog_ident)
fprintf(kmsg, "%s: ", _ulog_ident);
vfprintf(kmsg, fmt, ap);
fclose(kmsg);
}
}
__attribute__((format(printf, 2, 0)))
static void ulog_stdio(int priority, const char *fmt, va_list ap)
{
FILE *out = stderr;
if (_ulog_ident)
fprintf(out, "%s: ", _ulog_ident);
vfprintf(out, fmt, ap);
}
__attribute__((format(printf, 2, 0)))
static void ulog_syslog(int priority, const char *fmt, va_list ap)
{
vsyslog(priority, fmt, ap);
}
void ulog_udebug(struct udebug_buf *_udb)
{
udb = _udb;
}
void ulog_open(int channels, int facility, const char *ident)
{
ulog_close();
_ulog_channels = channels;
_ulog_facility = facility;
_ulog_ident = ident;
}
void ulog_close(void)
{
if (!_ulog_initialized)
return;
if (_ulog_channels & ULOG_SYSLOG)
closelog();
_ulog_initialized = 0;
}
void ulog_threshold(int threshold)
{
_ulog_threshold = threshold;
}
void ulog(int priority, const char *fmt, ...)
{
va_list ap;
if (udb) {
va_start(ap, fmt);
udebug_entry_init(udb);
udebug_entry_vprintf(udb, fmt, ap);
udebug_entry_add(udb);
va_end(ap);
}
if (priority > _ulog_threshold)
return;
ulog_defaults();
if (_ulog_channels & ULOG_KMSG)
{
va_start(ap, fmt);
ulog_kmsg(priority, fmt, ap);
va_end(ap);
}
if (_ulog_channels & ULOG_STDIO)
{
va_start(ap, fmt);
ulog_stdio(priority, fmt, ap);
va_end(ap);
}
if (_ulog_channels & ULOG_SYSLOG)
{
va_start(ap, fmt);
ulog_syslog(priority, fmt, ap);
va_end(ap);
}
}