2 * Copyright (c) 1983, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
52 #include <bits/libc-lock.h>
62 # include <libio/iolibio.h>
63 # define ftell(s) _IO_ftell (s)
66 static int LogType = SOCK_DGRAM; /* type of socket connection */
67 static int LogFile = -1; /* fd for log */
68 static int connected; /* have done connect */
69 static int LogStat = 0; /* status bits, set by openlog() */
70 static const char *LogTag = NULL; /* string to tag the entry with */
71 static int LogFacility = LOG_USER; /* default facility code */
72 static int LogMask = 0xff; /* mask of priorities to be logged */
73 extern char *__progname; /* Program name, from crt0. */
75 /* Define the lock. */
76 __libc_lock_define_initialized (static, syslog_lock)
78 static void openlog_internal(const char *, int, int) internal_function;
79 static void closelog_internal(void);
80 static void sigpipe_handler (int);
81 #ifdef _LIBC_REENTRANT
82 static void cancel_handler (void *);
87 * print message on log file; output is intended for syslogd(8).
91 syslog(int pri, const char *fmt, ...)
93 syslog(pri, fmt, va_alist)
106 vsyslog(pri, fmt, ap);
111 vsyslog(pri, fmt, ap)
113 register const char *fmt;
122 size_t prioff, msgoff;
123 struct sigaction action, oldaction;
124 struct sigaction *oldaction_ptr = NULL;
127 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
128 /* Check for invalid bits. */
129 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
131 "syslog: unknown facility/priority: %x", pri);
132 pri &= LOG_PRIMASK|LOG_FACMASK;
135 /* Check priority against setlogmask values. */
136 if (!LOG_MASK(LOG_PRI(pri)) & LogMask)
139 /* Set default facility if none specified. */
140 if ((pri & LOG_FACMASK) == 0)
143 /* Build the message in a memory-buffer stream. */
144 f = open_memstream (&buf, &bufsize);
145 prioff = fprintf (f, "<%d>", pri);
148 f->_IO_write_ptr += strftime (f->_IO_write_ptr,
149 f->_IO_write_end - f->_IO_write_ptr,
151 __localtime_r (&now, &now_tm));
153 f->__bufp += strftime (f->__bufp, f->__put_limit - f->__bufp,
154 "%h %e %T ", __localtime_r (&now, &now_tm));
160 fputs_unlocked (LogTag, f);
161 if (LogStat & LOG_PID)
162 fprintf (f, "[%d]", __getpid ());
164 putc_unlocked (':', f), putc_unlocked (' ', f);
166 /* We have the header. Print the user's format into the buffer. */
167 vfprintf (f, fmt, ap);
169 /* Close the memory stream; this will finalize the data
170 into a malloc'd buffer in BUF. */
173 /* Output to stderr if requested. */
174 if (LogStat & LOG_PERROR) {
176 register struct iovec *v = iov;
178 v->iov_base = buf + msgoff;
179 v->iov_len = bufsize - msgoff;
181 v->iov_base = (char *) "\n";
183 (void)__writev(STDERR_FILENO, iov, 2);
186 /* Prepare for multiple users. We have to take care: open and
187 write are cancellation points. */
188 __libc_cleanup_region_start ((void (*) (void *)) cancel_handler,
190 __libc_lock_lock (syslog_lock);
192 /* Prepare for a broken connection. */
193 memset (&action, 0, sizeof (action));
194 action.sa_handler = sigpipe_handler;
195 sigemptyset (&action.sa_mask);
196 sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
198 oldaction_ptr = &oldaction;
200 /* Get connected, output the message to the local logger. */
202 openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
204 /* If we have a SOCK_STREAM connection, also send ASCII NUL as
205 a record terminator. */
206 if (LogType == SOCK_STREAM)
209 if (!connected || __send(LogFile, buf, bufsize, 0) < 0)
211 closelog_internal (); /* attempt re-open next time */
213 * Output the message to the console; don't worry about blocking,
214 * if console blocks everything will. Make sure the error reported
215 * is the one from the syslogd failure.
217 if (LogStat & LOG_CONS &&
218 (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
220 dprintf (fd, "%s\r\n", buf + msgoff);
226 __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
228 /* End of critical section. */
229 __libc_cleanup_region_end (0);
230 __libc_lock_unlock (syslog_lock);
235 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
239 openlog_internal(const char *ident, int logstat, int logfac)
244 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
245 LogFacility = logfac;
249 SyslogAddr.sa_family = AF_UNIX;
250 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
251 sizeof(SyslogAddr.sa_data));
252 if (LogStat & LOG_NDELAY) {
253 if ((LogFile = __socket(AF_UNIX, LogType, 0))
256 (void)__fcntl(LogFile, F_SETFD, 1);
259 if (LogFile != -1 && !connected)
261 int old_errno = errno;
262 if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
265 int saved_errno = errno;
266 (void)__close(LogFile);
268 if (LogType == SOCK_DGRAM
269 && saved_errno == EPROTOTYPE)
271 /* retry with next SOCK_STREAM: */
272 LogType = SOCK_STREAM;
273 __set_errno (old_errno);
284 openlog (const char *ident, int logstat, int logfac)
286 /* Protect against multiple users. */
287 __libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
289 __libc_lock_lock (syslog_lock);
291 openlog_internal (ident, logstat, logfac);
294 __libc_cleanup_region_end (1);
298 sigpipe_handler (int signo)
300 closelog_internal ();
318 /* Protect against multiple users. */
319 __libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
321 __libc_lock_lock (syslog_lock);
323 closelog_internal ();
326 __libc_cleanup_region_end (1);
329 #ifdef _LIBC_REENTRANT
331 cancel_handler (void *ptr)
333 /* Restore the old signal handler. */
334 struct sigaction *oldaction = *((struct sigaction **) ptr);
336 if (oldaction != (struct sigaction *) NULL)
337 __sigaction (SIGPIPE, oldaction, (struct sigaction *) NULL);
340 __libc_lock_unlock (syslog_lock);
344 /* setlogmask -- set the log mask level */