[thirdparty/glibc.git] / misc / syslog.c

/*
 * Copyright (c) 1983, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c	8.4 (Berkeley) 3/18/94";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <netdb.h>

#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <libc-lock.h>
#include <signal.h>
#include <locale.h>

#include <stdarg.h>

#include <libio/libioP.h>
#include <math_ldbl_opt.h>

#include <kernel-features.h>

#define ftell(s) _IO_ftell (s)

static int	LogType = SOCK_DGRAM;	/* type of socket connection */
static int	LogFile = -1;		/* fd for log */
static int	connected;		/* have done connect */
static int	LogStat;		/* status bits, set by openlog() */
static const char *LogTag;		/* string to tag the entry with */
static int	LogFacility = LOG_USER;	/* default facility code */
static int	LogMask = 0xff;		/* mask of priorities to be logged */
extern char	*__progname;		/* Program name, from crt0. */

/* Define the lock.  */
__libc_lock_define_initialized (static, syslog_lock)

static void openlog_internal(const char *, int, int);
static void closelog_internal(void);
#ifndef NO_SIGPIPE
static void sigpipe_handler (int);
#endif

#ifndef send_flags
# define send_flags 0
#endif

struct cleanup_arg
{
  void *buf;
  struct sigaction *oldaction;
};

static void
cancel_handler (void *ptr)
{
  /* Restore the old signal handler.  */
  struct cleanup_arg *clarg = (struct cleanup_arg *) ptr;

  if (clarg != NULL)
    {
#ifndef NO_SIGPIPE
      if (clarg->oldaction != NULL)
	__sigaction (SIGPIPE, clarg->oldaction, NULL);
#endif

      /* Free the memstream buffer,  */
      free (clarg->buf);
    }

  /* Free the lock.  */
  __libc_lock_unlock (syslog_lock);
}


/*
 * syslog, vsyslog --
 *	print message on log file; output is intended for syslogd(8).
 */
void
__syslog(int pri, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	__vsyslog_internal(pri, fmt, ap, 0);
	va_end(ap);
}
ldbl_hidden_def (__syslog, syslog)
ldbl_strong_alias (__syslog, syslog)

void
__vsyslog(int pri, const char *fmt, va_list ap)
{
	__vsyslog_internal(pri, fmt, ap, 0);
}
ldbl_weak_alias (__vsyslog, vsyslog)

void
__syslog_chk(int pri, int flag, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	__vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0);
	va_end(ap);
}

void
__vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
{
	__vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0);
}

void
__vsyslog_internal(int pri, const char *fmt, va_list ap,
		   unsigned int mode_flags)
{
	struct tm now_tm;
	time_t now;
	int fd;
	FILE *f;
	char *buf = 0;
	size_t bufsize = 0;
	size_t msgoff;
#ifndef NO_SIGPIPE
 	struct sigaction action, oldaction;
 	int sigpipe;
#endif
	int saved_errno = errno;
	char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"];

#define	INTERNALLOG	LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
	/* Check for invalid bits. */
	if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
		syslog(INTERNALLOG,
		    "syslog: unknown facility/priority: %x", pri);
		pri &= LOG_PRIMASK|LOG_FACMASK;
	}

	/* Prepare for multiple users.  We have to take care: most
	   syscalls we are using are cancellation points.  */
	struct cleanup_arg clarg;
	clarg.buf = NULL;
	clarg.oldaction = NULL;
	__libc_cleanup_push (cancel_handler, &clarg);
	__libc_lock_lock (syslog_lock);

	/* Check priority against setlogmask values. */
	if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0)
		goto out;

	/* Set default facility if none specified. */
	if ((pri & LOG_FACMASK) == 0)
		pri |= LogFacility;

	/* Build the message in a memory-buffer stream.  */
	f = __open_memstream (&buf, &bufsize);
	if (f == NULL)
	  {
	    /* We cannot get a stream.  There is not much we can do but
	       emitting an error messages.  */
	    char numbuf[3 * sizeof (pid_t)];
	    char *nump;
	    char *endp = __stpcpy (failbuf, "out of memory [");
	    pid_t pid = __getpid ();

	    nump = numbuf + sizeof (numbuf);
	    /* The PID can never be zero.  */
	    do
	      *--nump = '0' + pid % 10;
	    while ((pid /= 10) != 0);

	    endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump);
	    *endp++ = ']';
	    *endp = '\0';
	    buf = failbuf;
	    bufsize = endp - failbuf;
	    msgoff = 0;
	  }
	else
	  {
	    __fsetlocking (f, FSETLOCKING_BYCALLER);
	    fprintf (f, "<%d>", pri);
	    now = time_now ();
	    f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr,
					      f->_IO_write_end
					      - f->_IO_write_ptr,
					      "%h %e %T ",
					      __localtime_r (&now, &now_tm),
					      _nl_C_locobj_ptr);
	    msgoff = ftell (f);
	    if (LogTag == NULL)
	      LogTag = __progname;
	    if (LogTag != NULL)
	      __fputs_unlocked (LogTag, f);
	    if (LogStat & LOG_PID)
	      fprintf (f, "[%d]", (int) __getpid ());
	    if (LogTag != NULL)
	      {
		__putc_unlocked (':', f);
		__putc_unlocked (' ', f);
	      }

	    /* Restore errno for %m format.  */
	    __set_errno (saved_errno);

	    /* We have the header.  Print the user's format into the
	       buffer.  */
	    __vfprintf_internal (f, fmt, ap, mode_flags);

	    /* Close the memory stream; this will finalize the data
	       into a malloc'd buffer in BUF.  */
	    fclose (f);

	    /* Tell the cancellation handler to free this buffer.  */
	    clarg.buf = buf;
	  }

	/* Output to stderr if requested. */
	if (LogStat & LOG_PERROR) {
		struct iovec iov[2];
		struct iovec *v = iov;

		v->iov_base = buf + msgoff;
		v->iov_len = bufsize - msgoff;
		/* Append a newline if necessary.  */
		if (buf[bufsize - 1] != '\n')
		  {
		    ++v;
		    v->iov_base = (char *) "\n";
		    v->iov_len = 1;
		  }

		/* writev is a cancellation point.  */
		(void)__writev(STDERR_FILENO, iov, v - iov + 1);
	}

#ifndef NO_SIGPIPE
	/* Prepare for a broken connection.  */
 	memset (&action, 0, sizeof (action));
 	action.sa_handler = sigpipe_handler;
 	sigemptyset (&action.sa_mask);
 	sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
	if (sigpipe == 0)
	  clarg.oldaction = &oldaction;
#endif

	/* Get connected, output the message to the local logger. */
	if (!connected)
		openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);

	/* If we have a SOCK_STREAM connection, also send ASCII NUL as
	   a record terminator.  */
	if (LogType == SOCK_STREAM)
	  ++bufsize;

	if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
	  {
	    if (connected)
	      {
		/* Try to reopen the syslog connection.  Maybe it went
		   down.  */
		closelog_internal ();
		openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
	      }

	    if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
	      {
		closelog_internal ();	/* attempt re-open next time */
		/*
		 * Output the message to the console; don't worry
		 * about blocking, if console blocks everything will.
		 * Make sure the error reported is the one from the
		 * syslogd failure.
		 */
		if (LogStat & LOG_CONS &&
		    (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
		  {
		    __dprintf (fd, "%s\r\n", buf + msgoff);
		    (void)__close(fd);
		  }
	      }
	  }

#ifndef NO_SIGPIPE
	if (sigpipe == 0)
		__sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
#endif

 out:
	/* End of critical section.  */
	__libc_cleanup_pop (0);
	__libc_lock_unlock (syslog_lock);

	if (buf != failbuf)
		free (buf);
}

static struct sockaddr_un SyslogAddr;	/* AF_UNIX address of local logger */


static void
openlog_internal(const char *ident, int logstat, int logfac)
{
	if (ident != NULL)
		LogTag = ident;
	LogStat = logstat;
	if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
		LogFacility = logfac;

	int retry = 0;
	while (retry < 2) {
		if (LogFile == -1) {
			SyslogAddr.sun_family = AF_UNIX;
			(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
				      sizeof(SyslogAddr.sun_path));
			if (LogStat & LOG_NDELAY) {
			  LogFile = __socket(AF_UNIX, LogType | SOCK_CLOEXEC, 0);
			  if (LogFile == -1)
			    return;
			}
		}
		if (LogFile != -1 && !connected)
		{
			int old_errno = errno;
			if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
			    == -1)
			{
				int saved_errno = errno;
				int fd = LogFile;
				LogFile = -1;
				(void)__close(fd);
				__set_errno (old_errno);
				if (saved_errno == EPROTOTYPE)
				{
					/* retry with the other type: */
					LogType = (LogType == SOCK_DGRAM
						   ? SOCK_STREAM : SOCK_DGRAM);
					++retry;
					continue;
				}
			} else
				connected = 1;
		}
		break;
	}
}

void
openlog (const char *ident, int logstat, int logfac)
{
  /* Protect against multiple users and cancellation.  */
  __libc_cleanup_push (cancel_handler, NULL);
  __libc_lock_lock (syslog_lock);

  openlog_internal (ident, logstat, logfac);

  __libc_cleanup_pop (1);
}

#ifndef NO_SIGPIPE
static void
sigpipe_handler (int signo)
{
  closelog_internal ();
}
#endif

static void
closelog_internal (void)
{
  if (!connected)
    return;

  __close (LogFile);
  LogFile = -1;
  connected = 0;
}

void
closelog (void)
{
  /* Protect against multiple users and cancellation.  */
  __libc_cleanup_push (cancel_handler, NULL);
  __libc_lock_lock (syslog_lock);

  closelog_internal ();
  LogTag = NULL;
  LogType = SOCK_DGRAM; /* this is the default */

  /* Free the lock.  */
  __libc_cleanup_pop (1);
}

/* setlogmask -- set the log mask level */
int
setlogmask (int pmask)
{
	int omask;

	/* Protect against multiple users.  */
	__libc_lock_lock (syslog_lock);

	omask = LogMask;
	if (pmask != 0)
		LogMask = pmask;

	__libc_lock_unlock (syslog_lock);

	return (omask);
}
Commit	Line	Data
790aa1f2 UD	1	/*
	2	* Copyright (c) 1983, 1988, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	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	* 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.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	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 */
	33
	34	#include <sys/types.h>
	35	#include <sys/socket.h>
	36	#include <sys/syslog.h>
	37	#include <sys/uio.h>
7ab7969c	38	#include <sys/un.h>
790aa1f2 UD	39	#include <netdb.h>
	40
	41	#include <errno.h>
	42	#include <fcntl.h>
	43	#include <paths.h>
	44	#include <stdio.h>
	45	#include <stdio_ext.h>
	46	#include <string.h>
	47	#include <time.h>
	48	#include <unistd.h>
	49	#include <stdlib.h>
ec999b8e	50	#include <libc-lock.h>
790aa1f2 UD	51	#include <signal.h>
	52	#include <locale.h>
	53
790aa1f2	54	#include <stdarg.h>
790aa1f2	55
124fc732	56	#include <libio/libioP.h>
c6251f03 RM	57	#include <math_ldbl_opt.h>
c6251f03 RM	58
37233df9 TS	59	#include <kernel-features.h>
37233df9 TS	60
d18ea0c5	61	#define ftell(s) _IO_ftell (s)
790aa1f2 UD	62
	63	static int LogType = SOCK_DGRAM; /* type of socket connection */
	64	static int LogFile = -1; /* fd for log */
	65	static int connected; /* have done connect */
	66	static int LogStat; /* status bits, set by openlog() */
	67	static const char LogTag; / string to tag the entry with */
	68	static int LogFacility = LOG_USER; /* default facility code */
	69	static int LogMask = 0xff; /* mask of priorities to be logged */
	70	extern char __progname; / Program name, from crt0. */
	71
	72	/* Define the lock. */
	73	__libc_lock_define_initialized (static, syslog_lock)
	74
ab5bf7cf	75	static void openlog_internal(const char *, int, int);
790aa1f2	76	static void closelog_internal(void);
4bb51523	77	#ifndef NO_SIGPIPE
790aa1f2	78	static void sigpipe_handler (int);
4bb51523	79	#endif
790aa1f2	80
69553a9b RM	81	#ifndef send_flags
	82	# define send_flags 0
	83	#endif
790aa1f2 UD	84
	85	struct cleanup_arg
	86	{
	87	void *buf;
	88	struct sigaction *oldaction;
	89	};
	90
	91	static void
	92	cancel_handler (void *ptr)
	93	{
790aa1f2 UD	94	/* Restore the old signal handler. */
	95	struct cleanup_arg clarg = (struct cleanup_arg ) ptr;
	96
c4e4b2e1 AS	97	if (clarg != NULL)
	98	{
	99	#ifndef NO_SIGPIPE
	100	if (clarg->oldaction != NULL)
	101	__sigaction (SIGPIPE, clarg->oldaction, NULL);
790aa1f2 UD	102	#endif
790aa1f2 UD	103
c4e4b2e1 AS	104	/* Free the memstream buffer, */
	105	free (clarg->buf);
	106	}
	107
790aa1f2 UD	108	/* Free the lock. */
	109	__libc_lock_unlock (syslog_lock);
	110	}
	111
	112
	113	/*
	114	* syslog, vsyslog --
	115	* print message on log file; output is intended for syslogd(8).
	116	*/
	117	void
c6251f03	118	__syslog(int pri, const char *fmt, ...)
790aa1f2 UD	119	{
	120	va_list ap;
	121
790aa1f2	122	va_start(ap, fmt);
124fc732	123	__vsyslog_internal(pri, fmt, ap, 0);
790aa1f2 UD	124	va_end(ap);
790aa1f2 UD	125	}
c6251f03 RM	126	ldbl_hidden_def (__syslog, syslog)
c6251f03 RM	127	ldbl_strong_alias (__syslog, syslog)
790aa1f2	128
124fc732 ZW	129	void
	130	__vsyslog(int pri, const char *fmt, va_list ap)
	131	{
	132	__vsyslog_internal(pri, fmt, ap, 0);
	133	}
	134	ldbl_weak_alias (__vsyslog, vsyslog)
	135
790aa1f2	136	void
29c21e49 UD	137	__syslog_chk(int pri, int flag, const char *fmt, ...)
29c21e49 UD	138	{
790aa1f2	139	va_list ap;
29c21e49 UD	140
29c21e49 UD	141	va_start(ap, fmt);
124fc732	142	__vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0);
29c21e49 UD	143	va_end(ap);
	144	}
	145
	146	void
	147	__vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
124fc732 ZW	148	{
	149	__vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0);
	150	}
	151
	152	void
	153	__vsyslog_internal(int pri, const char *fmt, va_list ap,
	154	unsigned int mode_flags)
790aa1f2 UD	155	{
	156	struct tm now_tm;
	157	time_t now;
	158	int fd;
	159	FILE *f;
	160	char *buf = 0;
	161	size_t bufsize = 0;
5615eaf2	162	size_t msgoff;
790aa1f2 UD	163	#ifndef NO_SIGPIPE
	164	struct sigaction action, oldaction;
	165	int sigpipe;
	166	#endif
	167	int saved_errno = errno;
	168	char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"];
	169
	170	#define INTERNALLOG LOG_ERR\|LOG_CONS\|LOG_PERROR\|LOG_PID
	171	/* Check for invalid bits. */
	172	if (pri & ~(LOG_PRIMASK\|LOG_FACMASK)) {
	173	syslog(INTERNALLOG,
	174	"syslog: unknown facility/priority: %x", pri);
	175	pri &= LOG_PRIMASK\|LOG_FACMASK;
	176	}
	177
c4e4b2e1 AS	178	/* Prepare for multiple users. We have to take care: most
	179	syscalls we are using are cancellation points. */
	180	struct cleanup_arg clarg;
	181	clarg.buf = NULL;
	182	clarg.oldaction = NULL;
	183	__libc_cleanup_push (cancel_handler, &clarg);
	184	__libc_lock_lock (syslog_lock);
	185
790aa1f2 UD	186	/* Check priority against setlogmask values. */
790aa1f2 UD	187	if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0)
c4e4b2e1	188	goto out;
790aa1f2 UD	189
	190	/* Set default facility if none specified. */
	191	if ((pri & LOG_FACMASK) == 0)
	192	pri \|= LogFacility;
	193
	194	/* Build the message in a memory-buffer stream. */
711f67a7	195	f = __open_memstream (&buf, &bufsize);
790aa1f2 UD	196	if (f == NULL)
	197	{
	198	/* We cannot get a stream. There is not much we can do but
	199	emitting an error messages. */
	200	char numbuf[3 * sizeof (pid_t)];
	201	char *nump;
	202	char *endp = __stpcpy (failbuf, "out of memory [");
	203	pid_t pid = __getpid ();
	204
	205	nump = numbuf + sizeof (numbuf);
	206	/* The PID can never be zero. */
	207	do
	208	*--nump = '0' + pid % 10;
	209	while ((pid /= 10) != 0);
	210
	211	endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump);
	212	*endp++ = ']';
	213	*endp = '\0';
	214	buf = failbuf;
	215	bufsize = endp - failbuf;
	216	msgoff = 0;
	217	}
	218	else
	219	{
	220	__fsetlocking (f, FSETLOCKING_BYCALLER);
5615eaf2	221	fprintf (f, "<%d>", pri);
f9a75540	222	now = time_now ();
790aa1f2 UD	223	f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr,
	224	f->_IO_write_end
	225	- f->_IO_write_ptr,
	226	"%h %e %T ",
	227	__localtime_r (&now, &now_tm),
4b5b009c	228	_nl_C_locobj_ptr);
790aa1f2 UD	229	msgoff = ftell (f);
	230	if (LogTag == NULL)
	231	LogTag = __progname;
	232	if (LogTag != NULL)
3164bf09	233	__fputs_unlocked (LogTag, f);
790aa1f2 UD	234	if (LogStat & LOG_PID)
	235	fprintf (f, "[%d]", (int) __getpid ());
	236	if (LogTag != NULL)
	237	{
039c721a JM	238	__putc_unlocked (':', f);
039c721a JM	239	__putc_unlocked (' ', f);
790aa1f2 UD	240	}
	241
	242	/* Restore errno for %m format. */
	243	__set_errno (saved_errno);
	244
	245	/* We have the header. Print the user's format into the
124fc732 ZW	246	buffer. */
124fc732 ZW	247	__vfprintf_internal (f, fmt, ap, mode_flags);
790aa1f2 UD	248
	249	/* Close the memory stream; this will finalize the data
	250	into a malloc'd buffer in BUF. */
	251	fclose (f);
c4e4b2e1 AS	252
	253	/* Tell the cancellation handler to free this buffer. */
	254	clarg.buf = buf;
790aa1f2 UD	255	}
	256
	257	/* Output to stderr if requested. */
	258	if (LogStat & LOG_PERROR) {
	259	struct iovec iov[2];
2e09a79a	260	struct iovec *v = iov;
790aa1f2 UD	261
	262	v->iov_base = buf + msgoff;
	263	v->iov_len = bufsize - msgoff;
	264	/* Append a newline if necessary. */
	265	if (buf[bufsize - 1] != '\n')
	266	{
	267	++v;
	268	v->iov_base = (char *) "\n";
	269	v->iov_len = 1;
	270	}
	271
790aa1f2 UD	272	/* writev is a cancellation point. */
790aa1f2 UD	273	(void)__writev(STDERR_FILENO, iov, v - iov + 1);
790aa1f2 UD	274	}
790aa1f2 UD	275
790aa1f2 UD	276	#ifndef NO_SIGPIPE
	277	/* Prepare for a broken connection. */
	278	memset (&action, 0, sizeof (action));
	279	action.sa_handler = sigpipe_handler;
	280	sigemptyset (&action.sa_mask);
	281	sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
	282	if (sigpipe == 0)
	283	clarg.oldaction = &oldaction;
	284	#endif
	285
	286	/* Get connected, output the message to the local logger. */
	287	if (!connected)
	288	openlog_internal(LogTag, LogStat \| LOG_NDELAY, 0);
	289
	290	/* If we have a SOCK_STREAM connection, also send ASCII NUL as
	291	a record terminator. */
	292	if (LogType == SOCK_STREAM)
	293	++bufsize;
	294
	295	if (!connected \|\| __send(LogFile, buf, bufsize, send_flags) < 0)
	296	{
	297	if (connected)
	298	{
	299	/* Try to reopen the syslog connection. Maybe it went
	300	down. */
	301	closelog_internal ();
	302	openlog_internal(LogTag, LogStat \| LOG_NDELAY, 0);
	303	}
	304
	305	if (!connected \|\| __send(LogFile, buf, bufsize, send_flags) < 0)
	306	{
	307	closelog_internal (); /* attempt re-open next time */
	308	/*
	309	* Output the message to the console; don't worry
	310	* about blocking, if console blocks everything will.
	311	* Make sure the error reported is the one from the
	312	* syslogd failure.
	313	*/
	314	if (LogStat & LOG_CONS &&
	315	(fd = __open(_PATH_CONSOLE, O_WRONLY\|O_NOCTTY, 0)) >= 0)
	316	{
be7dc2b7	317	__dprintf (fd, "%s\r\n", buf + msgoff);
790aa1f2 UD	318	(void)__close(fd);
	319	}
	320	}
	321	}
	322
	323	#ifndef NO_SIGPIPE
	324	if (sigpipe == 0)
	325	__sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
	326	#endif
	327
c4e4b2e1	328	out:
790aa1f2 UD	329	/* End of critical section. */
	330	__libc_cleanup_pop (0);
	331	__libc_lock_unlock (syslog_lock);
	332
	333	if (buf != failbuf)
	334	free (buf);
	335	}
790aa1f2	336
7ab7969c	337	static struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
790aa1f2 UD	338
	339
	340	static void
790aa1f2 UD	341	openlog_internal(const char *ident, int logstat, int logfac)
	342	{
	343	if (ident != NULL)
	344	LogTag = ident;
	345	LogStat = logstat;
	346	if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
	347	LogFacility = logfac;
	348
	349	int retry = 0;
	350	while (retry < 2) {
	351	if (LogFile == -1) {
7ab7969c UD	352	SyslogAddr.sun_family = AF_UNIX;
	353	(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
	354	sizeof(SyslogAddr.sun_path));
790aa1f2	355	if (LogStat & LOG_NDELAY) {
52fb79d6 FW	356	LogFile = __socket(AF_UNIX, LogType \| SOCK_CLOEXEC, 0);
	357	if (LogFile == -1)
	358	return;
790aa1f2 UD	359	}
	360	}
	361	if (LogFile != -1 && !connected)
	362	{
	363	int old_errno = errno;
	364	if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
	365	== -1)
	366	{
	367	int saved_errno = errno;
	368	int fd = LogFile;
	369	LogFile = -1;
	370	(void)__close(fd);
	371	__set_errno (old_errno);
	372	if (saved_errno == EPROTOTYPE)
	373	{
	374	/* retry with the other type: */
	375	LogType = (LogType == SOCK_DGRAM
	376	? SOCK_STREAM : SOCK_DGRAM);
	377	++retry;
	378	continue;
	379	}
	380	} else
	381	connected = 1;
	382	}
	383	break;
	384	}
	385	}
	386
	387	void
	388	openlog (const char *ident, int logstat, int logfac)
	389	{
	390	/* Protect against multiple users and cancellation. */
	391	__libc_cleanup_push (cancel_handler, NULL);
	392	__libc_lock_lock (syslog_lock);
	393
	394	openlog_internal (ident, logstat, logfac);
	395
	396	__libc_cleanup_pop (1);
	397	}
	398
	399	#ifndef NO_SIGPIPE
	400	static void
	401	sigpipe_handler (int signo)
	402	{
	403	closelog_internal ();
	404	}
	405	#endif
	406
	407	static void
60d2f8f3	408	closelog_internal (void)
790aa1f2 UD	409	{
	410	if (!connected)
	411	return;
	412
	413	__close (LogFile);
	414	LogFile = -1;
	415	connected = 0;
	416	}
	417
	418	void
60d2f8f3	419	closelog (void)
790aa1f2 UD	420	{
	421	/* Protect against multiple users and cancellation. */
	422	__libc_cleanup_push (cancel_handler, NULL);
	423	__libc_lock_lock (syslog_lock);
	424
	425	closelog_internal ();
	426	LogTag = NULL;
	427	LogType = SOCK_DGRAM; /* this is the default */
	428
	429	/* Free the lock. */
	430	__libc_cleanup_pop (1);
	431	}
	432
	433	/* setlogmask -- set the log mask level */
	434	int
9d46370c	435	setlogmask (int pmask)
790aa1f2 UD	436	{
	437	int omask;
	438
c4e4b2e1 AS	439	/* Protect against multiple users. */
	440	__libc_lock_lock (syslog_lock);
	441
790aa1f2 UD	442	omask = LogMask;
	443	if (pmask != 0)
	444	LogMask = pmask;
c4e4b2e1 AS	445
	446	__libc_lock_unlock (syslog_lock);
	447
790aa1f2 UD	448	return (omask);
790aa1f2 UD	449	}