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
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12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94";
32 #endif /* LIBC_SCCS and not lint */
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <sys/syslog.h>
44 #include <stdio_ext.h>
49 #include <bits/libc-lock.h>
59 #include <libio/iolibio.h>
60 #define ftell(s) INTUSE(_IO_ftell) (s)
62 static int LogType = SOCK_DGRAM; /* type of socket connection */
63 static int LogFile = -1; /* fd for log */
64 static int connected; /* have done connect */
65 static int LogStat; /* status bits, set by openlog() */
66 static const char *LogTag; /* string to tag the entry with */
67 static int LogFacility = LOG_USER; /* default facility code */
68 static int LogMask = 0xff; /* mask of priorities to be logged */
69 extern char *__progname; /* Program name, from crt0. */
71 /* Define the lock. */
72 __libc_lock_define_initialized (static, syslog_lock)
74 static void openlog_internal(const char *, int, int) internal_function;
75 static void closelog_internal(void);
77 static void sigpipe_handler (int);
87 struct sigaction *oldaction;
91 cancel_handler (void *ptr)
94 /* Restore the old signal handler. */
95 struct cleanup_arg *clarg = (struct cleanup_arg *) ptr;
97 if (clarg != NULL && clarg->oldaction != NULL)
98 __sigaction (SIGPIPE, clarg->oldaction, NULL);
102 __libc_lock_unlock (syslog_lock);
108 * print message on log file; output is intended for syslogd(8).
111 syslog(int pri, const char *fmt, ...)
116 __vsyslog_chk(pri, -1, fmt, ap);
119 libc_hidden_def (syslog)
122 __syslog_chk(int pri, int flag, const char *fmt, ...)
127 __vsyslog_chk(pri, flag, fmt, ap);
132 __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
140 size_t prioff, msgoff;
142 struct sigaction action, oldaction;
145 int saved_errno = errno;
146 char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"];
148 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
149 /* Check for invalid bits. */
150 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
152 "syslog: unknown facility/priority: %x", pri);
153 pri &= LOG_PRIMASK|LOG_FACMASK;
156 /* Check priority against setlogmask values. */
157 if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0)
160 /* Set default facility if none specified. */
161 if ((pri & LOG_FACMASK) == 0)
164 /* Build the message in a memory-buffer stream. */
165 f = open_memstream (&buf, &bufsize);
168 /* We cannot get a stream. There is not much we can do but
169 emitting an error messages. */
170 char numbuf[3 * sizeof (pid_t)];
172 char *endp = __stpcpy (failbuf, "out of memory [");
173 pid_t pid = __getpid ();
175 nump = numbuf + sizeof (numbuf);
176 /* The PID can never be zero. */
178 *--nump = '0' + pid % 10;
179 while ((pid /= 10) != 0);
181 endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump);
185 bufsize = endp - failbuf;
190 __fsetlocking (f, FSETLOCKING_BYCALLER);
191 prioff = fprintf (f, "<%d>", pri);
193 f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr,
197 __localtime_r (&now, &now_tm),
203 fputs_unlocked (LogTag, f);
204 if (LogStat & LOG_PID)
205 fprintf (f, "[%d]", (int) __getpid ());
208 putc_unlocked (':', f);
209 putc_unlocked (' ', f);
212 /* Restore errno for %m format. */
213 __set_errno (saved_errno);
215 /* We have the header. Print the user's format into the
218 vfprintf (f, fmt, ap);
220 __vfprintf_chk (f, flag, fmt, ap);
222 /* Close the memory stream; this will finalize the data
223 into a malloc'd buffer in BUF. */
227 /* Output to stderr if requested. */
228 if (LogStat & LOG_PERROR) {
230 register struct iovec *v = iov;
232 v->iov_base = buf + msgoff;
233 v->iov_len = bufsize - msgoff;
234 /* Append a newline if necessary. */
235 if (buf[bufsize - 1] != '\n')
238 v->iov_base = (char *) "\n";
242 __libc_cleanup_push (free, buf == failbuf ? NULL : buf);
244 /* writev is a cancellation point. */
245 (void)__writev(STDERR_FILENO, iov, v - iov + 1);
247 __libc_cleanup_pop (0);
250 /* Prepare for multiple users. We have to take care: open and
251 write are cancellation points. */
252 struct cleanup_arg clarg;
254 clarg.oldaction = NULL;
255 __libc_cleanup_push (cancel_handler, &clarg);
256 __libc_lock_lock (syslog_lock);
259 /* Prepare for a broken connection. */
260 memset (&action, 0, sizeof (action));
261 action.sa_handler = sigpipe_handler;
262 sigemptyset (&action.sa_mask);
263 sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
265 clarg.oldaction = &oldaction;
268 /* Get connected, output the message to the local logger. */
270 openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
272 /* If we have a SOCK_STREAM connection, also send ASCII NUL as
273 a record terminator. */
274 if (LogType == SOCK_STREAM)
277 if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
281 /* Try to reopen the syslog connection. Maybe it went
283 closelog_internal ();
284 openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
287 if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
289 closelog_internal (); /* attempt re-open next time */
291 * Output the message to the console; don't worry
292 * about blocking, if console blocks everything will.
293 * Make sure the error reported is the one from the
296 if (LogStat & LOG_CONS &&
297 (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
299 dprintf (fd, "%s\r\n", buf + msgoff);
307 __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
310 /* End of critical section. */
311 __libc_cleanup_pop (0);
312 __libc_lock_unlock (syslog_lock);
317 libc_hidden_def (__vsyslog_chk)
320 vsyslog(pri, fmt, ap)
322 register const char *fmt;
325 __vsyslog_chk (pri, -1, fmt, ap);
327 libc_hidden_def (vsyslog)
329 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
334 openlog_internal(const char *ident, int logstat, int logfac)
339 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
340 LogFacility = logfac;
345 SyslogAddr.sa_family = AF_UNIX;
346 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
347 sizeof(SyslogAddr.sa_data));
348 if (LogStat & LOG_NDELAY) {
349 if ((LogFile = __socket(AF_UNIX, LogType, 0))
352 (void)__fcntl(LogFile, F_SETFD, 1);
355 if (LogFile != -1 && !connected)
357 int old_errno = errno;
358 if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
361 int saved_errno = errno;
365 __set_errno (old_errno);
366 if (saved_errno == EPROTOTYPE)
368 /* retry with the other type: */
369 LogType = (LogType == SOCK_DGRAM
370 ? SOCK_STREAM : SOCK_DGRAM);
382 openlog (const char *ident, int logstat, int logfac)
384 /* Protect against multiple users and cancellation. */
385 __libc_cleanup_push (cancel_handler, NULL);
386 __libc_lock_lock (syslog_lock);
388 openlog_internal (ident, logstat, logfac);
390 __libc_cleanup_pop (1);
395 sigpipe_handler (int signo)
397 closelog_internal ();
415 /* Protect against multiple users and cancellation. */
416 __libc_cleanup_push (cancel_handler, NULL);
417 __libc_lock_lock (syslog_lock);
419 closelog_internal ();
421 LogType = SOCK_DGRAM; /* this is the default */
424 __libc_cleanup_pop (1);
427 /* setlogmask -- set the log mask level */