1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <sys/socket.h>
34 #define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)
35 #define LOG_BUFFER_MAX 1024
37 static LogTarget log_target = LOG_TARGET_CONSOLE;
38 static int log_max_level = LOG_DEBUG;
40 static int syslog_fd = -1;
41 static int kmsg_fd = -1;
43 /* Akin to glibc's __abort_msg; which is private and we hance cannot
45 static char *log_abort_msg = NULL;
47 void log_close_kmsg(void) {
50 close_nointr_nofail(kmsg_fd);
55 int log_open_kmsg(void) {
57 if (log_target != LOG_TARGET_KMSG) {
65 if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
66 log_info("Failed to open syslog for logging: %s", strerror(errno));
70 log_info("Succesfully opened /dev/kmsg for logging.");
75 void log_close_syslog(void) {
78 close_nointr_nofail(syslog_fd);
83 int log_open_syslog(void) {
86 struct sockaddr_un un;
91 if (log_target != LOG_TARGET_SYSLOG) {
99 if ((syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0)
102 /* Make sure we don't block for more than 5s when talking to
104 timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
105 if (setsockopt(syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
112 sa.un.sun_family = AF_UNIX;
113 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
115 if (connect(syslog_fd, &sa.sa, sizeof(sa)) < 0) {
119 log_info("Failed to open syslog for logging: %s", strerror(-r));
123 log_info("Succesfully opened syslog for logging.");
128 void log_set_target(LogTarget target) {
130 assert(target < _LOG_TARGET_MAX);
135 void log_set_max_level(int level) {
136 assert((level & LOG_PRIMASK) == level);
138 log_max_level = level;
141 static void write_to_console(
149 const char *prefix, *suffix;
151 if (LOG_PRI(level) <= LOG_ERR) {
152 prefix = "\x1B[1;31m";
159 fprintf(stderr, "(%s:%u) %s", file, line, prefix);
160 vfprintf(stderr, format, ap);
161 fprintf(stderr, "%s\n", suffix);
164 static int write_to_syslog(
172 char header_priority[16], header_time[64], header_pid[16];
173 char buffer[LOG_BUFFER_MAX];
174 struct iovec iovec[5];
175 struct msghdr msghdr;
182 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(level)));
183 char_array_0(header_priority);
185 t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
186 if (!(tm = localtime(&t)))
189 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
192 snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
193 char_array_0(header_pid);
195 vsnprintf(buffer, sizeof(buffer), format, ap);
196 char_array_0(buffer);
199 IOVEC_SET_STRING(iovec[0], header_priority);
200 IOVEC_SET_STRING(iovec[1], header_time);
201 IOVEC_SET_STRING(iovec[2], __progname);
202 IOVEC_SET_STRING(iovec[3], header_pid);
203 IOVEC_SET_STRING(iovec[4], buffer);
206 msghdr.msg_iov = iovec;
207 msghdr.msg_iovlen = ELEMENTSOF(iovec);
209 if (sendmsg(syslog_fd, &msghdr, 0) < 0)
215 static int write_to_kmsg(
223 char header_priority[16], header_pid[16];
224 char buffer[LOG_BUFFER_MAX];
225 struct iovec iovec[5];
230 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_PRI(level));
231 char_array_0(header_priority);
233 snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
234 char_array_0(header_pid);
236 vsnprintf(buffer, sizeof(buffer), format, ap);
237 char_array_0(buffer);
240 IOVEC_SET_STRING(iovec[0], header_priority);
241 IOVEC_SET_STRING(iovec[1], __progname);
242 IOVEC_SET_STRING(iovec[2], header_pid);
243 IOVEC_SET_STRING(iovec[3], buffer);
244 IOVEC_SET_STRING(iovec[4], (char*) "\n");
246 if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
252 #define LOG_DISPATCH(level,file,line,func,format) \
255 bool written = false; \
256 if (log_target == LOG_TARGET_KMSG) { \
257 va_start(_ap, format); \
258 written = write_to_kmsg(level, file, line, func, format, _ap) >= 0; \
260 } else if (log_target == LOG_TARGET_SYSLOG) { \
261 va_start(_ap, format); \
262 written = write_to_syslog(level, file, line, func, format, _ap) >= 0; \
266 va_start(_ap, format); \
267 write_to_console(level, file, line, func, format, _ap); \
277 const char *format, ...) {
281 if (LOG_PRI(level) > log_max_level)
285 LOG_DISPATCH(level, file, line, func, format);
293 const char *format, ...) {
295 static char buffer[LOG_BUFFER_MAX];
297 int saved_errno = errno;
299 va_start(ap, format);
300 vsnprintf(buffer, sizeof(buffer), format, ap);
303 char_array_0(buffer);
304 log_abort_msg = buffer;
306 LOG_DISPATCH(LOG_CRIT, file, line, func, format);
309 /* If the user chose to ignore this SIGABRT, we are happy to go on, as if nothing happened. */
313 int log_set_target_from_string(const char *e) {
316 if ((t = log_target_from_string(e)) < 0)
323 int log_set_max_level_from_string(const char *e) {
326 if ((t = log_level_from_string(e)) < 0)
329 log_set_max_level(t);
333 void log_parse_environment(void) {
336 if ((e = getenv("SYSTEMD_LOG_TARGET")))
337 if (log_set_target_from_string(e) < 0)
338 log_warning("Failed to parse log target %s. Ignoring.", e);
340 if ((e = getenv("SYSTEMD_LOG_LEVEL")))
341 if (log_set_max_level_from_string(e) < 0)
342 log_warning("Failed to parse log level %s. Ignoring.", e);
345 LogTarget log_get_target(void) {
349 int log_get_max_level(void) {
350 return log_max_level;
353 static const char *const log_target_table[] = {
354 [LOG_TARGET_CONSOLE] = "console",
355 [LOG_TARGET_SYSLOG] = "syslog",
356 [LOG_TARGET_KMSG] = "kmsg",
359 DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);