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 void log_close_kmsg(void) {
46 close_nointr(kmsg_fd);
51 int log_open_kmsg(void) {
53 if (log_target != LOG_TARGET_KMSG) {
61 if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
62 log_info("Failed to open syslog for logging: %s", strerror(errno));
66 log_info("Succesfully opened /dev/kmsg for logging.");
71 void log_close_syslog(void) {
74 close_nointr(syslog_fd);
79 int log_open_syslog(void) {
82 struct sockaddr_un un;
87 if (log_target != LOG_TARGET_SYSLOG) {
95 if ((syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0)
98 /* Make sure we don't block for more than 5s when talking to
100 timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
101 if (setsockopt(syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
108 sa.un.sun_family = AF_UNIX;
109 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
111 if (connect(syslog_fd, &sa.sa, sizeof(sa)) < 0) {
115 log_info("Failed to open syslog for logging: %s", strerror(-r));
119 log_info("Succesfully opened syslog for logging.");
124 void log_set_target(LogTarget target) {
126 assert(target < _LOG_TARGET_MAX);
131 void log_set_max_level(int level) {
132 assert((level & LOG_PRIMASK) == level);
134 log_max_level = level;
137 static void write_to_console(
145 const char *prefix, *suffix;
147 if (LOG_PRI(level) <= LOG_ERR) {
148 prefix = "\x1B[1;31m";
155 fprintf(stderr, "(%s:%u) %s", file, line, prefix);
156 vfprintf(stderr, format, ap);
157 fprintf(stderr, "%s\n", suffix);
160 static int write_to_syslog(
168 char header_priority[16], header_time[64], header_pid[16];
169 char buffer[LOG_BUFFER_MAX];
170 struct iovec iovec[5];
171 struct msghdr msghdr;
178 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(level)));
179 char_array_0(header_priority);
181 t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
182 if (!(tm = localtime(&t)))
185 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
188 snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
189 char_array_0(header_pid);
191 vsnprintf(buffer, sizeof(buffer), format, ap);
192 char_array_0(buffer);
195 IOVEC_SET_STRING(iovec[0], header_priority);
196 IOVEC_SET_STRING(iovec[1], header_time);
197 IOVEC_SET_STRING(iovec[2], __progname);
198 IOVEC_SET_STRING(iovec[3], header_pid);
199 IOVEC_SET_STRING(iovec[4], buffer);
202 msghdr.msg_iov = iovec;
203 msghdr.msg_iovlen = ELEMENTSOF(iovec);
205 if (sendmsg(syslog_fd, &msghdr, 0) < 0)
211 static int write_to_kmsg(
219 char header_priority[16], header_pid[16];
220 char buffer[LOG_BUFFER_MAX];
221 struct iovec iovec[5];
226 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_PRI(level));
227 char_array_0(header_priority);
229 snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
230 char_array_0(header_pid);
232 vsnprintf(buffer, sizeof(buffer), format, ap);
233 char_array_0(buffer);
236 IOVEC_SET_STRING(iovec[0], header_priority);
237 IOVEC_SET_STRING(iovec[1], __progname);
238 IOVEC_SET_STRING(iovec[2], header_pid);
239 IOVEC_SET_STRING(iovec[3], buffer);
240 IOVEC_SET_STRING(iovec[4], (char*) "\n");
242 if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
253 const char *format, ...) {
259 if (LOG_PRI(level) > log_max_level)
265 if (log_target == LOG_TARGET_KMSG) {
266 va_start(ap, format);
267 written = write_to_kmsg(level, file, line, func, format, ap) >= 0;
269 } else if (log_target == LOG_TARGET_SYSLOG) {
270 va_start(ap, format);
271 written = write_to_syslog(level, file, line, func, format, ap) >= 0;
276 va_start(ap, format);
277 write_to_console(level, file, line, func, format, ap);
284 int log_set_target_from_string(const char *e) {
287 if ((t = log_target_from_string(e)) < 0)
294 int log_set_max_level_from_string(const char *e) {
297 if ((t = log_level_from_string(e)) < 0)
300 log_set_max_level(t);
304 void log_parse_environment(void) {
307 if ((e = getenv("SYSTEMD_LOG_TARGET")))
308 if (log_set_target_from_string(e) < 0)
309 log_warning("Failed to parse log target %s. Ignoring.", e);
311 if ((e = getenv("SYSTEMD_LOG_LEVEL")))
312 if (log_set_max_level_from_string(e) < 0)
313 log_warning("Failed to parse log level %s. Ignoring.", e);
316 LogTarget log_get_target(void) {
320 int log_get_max_level(void) {
321 return log_max_level;
324 static const char *const log_target_table[] = {
325 [LOG_TARGET_CONSOLE] = "console",
326 [LOG_TARGET_SYSLOG] = "syslog",
327 [LOG_TARGET_KMSG] = "kmsg",
330 DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);