2 * ulog - simple logging functions
4 * Copyright (C) 2015 Jo-Philipp Wich <jow@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
27 static int _ulog_channels
= -1;
28 static int _ulog_facility
= -1;
29 static int _ulog_threshold
= LOG_DEBUG
;
30 static int _ulog_initialized
= 0;
31 static const char *_ulog_ident
= NULL
;
33 static const char *ulog_default_ident(void)
40 if ((self
= fopen("/proc/self/status", "r")) != NULL
) {
41 while (fgets(line
, sizeof(line
), self
)) {
42 if (!strncmp(line
, "Name:", 5)) {
43 strtok_r(line
, "\t\n", &sbuf
);
44 p
= strtok_r(NULL
, "\t\n", &sbuf
);
54 static void ulog_defaults(void)
58 if (_ulog_initialized
)
61 env
= getenv("PREINIT");
63 if (_ulog_channels
< 0) {
64 if (env
&& !strcmp(env
, "1"))
65 _ulog_channels
= ULOG_KMSG
;
67 _ulog_channels
= ULOG_STDIO
;
69 _ulog_channels
= ULOG_SYSLOG
;
72 if (_ulog_facility
< 0) {
73 if (env
&& !strcmp(env
, "1"))
74 _ulog_facility
= LOG_DAEMON
;
76 _ulog_facility
= LOG_USER
;
78 _ulog_facility
= LOG_DAEMON
;
81 if (_ulog_ident
== NULL
&& _ulog_channels
!= ULOG_STDIO
)
82 _ulog_ident
= ulog_default_ident();
84 if (_ulog_channels
& ULOG_SYSLOG
)
85 openlog(_ulog_ident
, 0, _ulog_facility
);
87 _ulog_initialized
= 1;
90 __attribute__((format(printf
, 2, 0)))
91 static void ulog_kmsg(int priority
, const char *fmt
, va_list ap
)
95 if ((kmsg
= fopen("/dev/kmsg", "r+")) != NULL
) {
96 fprintf(kmsg
, "<%u>", priority
);
99 fprintf(kmsg
, "%s: ", _ulog_ident
);
101 vfprintf(kmsg
, fmt
, ap
);
106 __attribute__((format(printf
, 2, 0)))
107 static void ulog_stdio(int priority
, const char *fmt
, va_list ap
)
112 fprintf(out
, "%s: ", _ulog_ident
);
114 vfprintf(out
, fmt
, ap
);
117 __attribute__((format(printf
, 2, 0)))
118 static void ulog_syslog(int priority
, const char *fmt
, va_list ap
)
120 vsyslog(priority
, fmt
, ap
);
123 void ulog_open(int channels
, int facility
, const char *ident
)
127 _ulog_channels
= channels
;
128 _ulog_facility
= facility
;
132 void ulog_close(void)
134 if (!_ulog_initialized
)
137 if (_ulog_channels
& ULOG_SYSLOG
)
140 _ulog_initialized
= 0;
143 void ulog_threshold(int threshold
)
145 _ulog_threshold
= threshold
;
148 void ulog(int priority
, const char *fmt
, ...)
152 if (priority
> _ulog_threshold
)
157 if (_ulog_channels
& ULOG_KMSG
)
160 ulog_kmsg(priority
, fmt
, ap
);
164 if (_ulog_channels
& ULOG_STDIO
)
167 ulog_stdio(priority
, fmt
, ap
);
171 if (_ulog_channels
& ULOG_SYSLOG
)
174 ulog_syslog(priority
, fmt
, ap
);