Update.

2005-01-24  Ulrich Drepper  <drepper@redhat.com>

	* misc/syslog.c: Moved to...
	* sysdeps/generic/syslog.c: ...here.
	[NO_SIGIPE]: Don't install SIGPIPE handler.
	* sysdeps/unix/sysv/linux/syslog.c: New file.
	* sysdeps/unix/sysv/linux/kernel-features.h: Define
	__ASSUME_MSG_NOSIGNAL.

3 files changed, 440 insertions, 1 deletions

diff --git a/sysdeps/generic/syslog.c b/sysdeps/generic/syslog.c
new file mode 100644
index 0000000000..2a1e4c4a5b
--- /dev/null
+++ b/sysdeps/generic/syslog.c
@@ -0,0 +1,424 @@
+/*
+ * 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 <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 <bits/libc-lock.h>
+#include <signal.h>
+#include <locale.h>
+
+#if __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+#include <libio/iolibio.h>
+#define ftell(s) INTUSE(_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) internal_function;
+static void closelog_internal(void);
+static void sigpipe_handler (int);
+
+
+struct cleanup_arg
+{
+  void *buf;
+  struct sigaction *oldaction;
+};
+
+static void
+cancel_handler (void *ptr)
+{
+#ifndef NO_SIGPIPE
+  /* Restore the old signal handler.  */
+  struct cleanup_arg *clarg = (struct cleanup_arg *) ptr;
+
+  if (clarg != NULL && clarg->oldaction != NULL)
+    __sigaction (SIGPIPE, clarg->oldaction, NULL);
+#endif
+
+  /* Free the lock.  */
+  __libc_lock_unlock (syslog_lock);
+}
+
+
+/*
+ * syslog, vsyslog --
+ *	print message on log file; output is intended for syslogd(8).
+ */
+void
+#if __STDC__
+syslog(int pri, const char *fmt, ...)
+#else
+syslog(pri, fmt, va_alist)
+	int pri;
+	char *fmt;
+	va_dcl
+#endif
+{
+	va_list ap;
+
+#if __STDC__
+	va_start(ap, fmt);
+#else
+	va_start(ap);
+#endif
+	vsyslog(pri, fmt, ap);
+	va_end(ap);
+}
+libc_hidden_def (syslog)
+
+void
+vsyslog(pri, fmt, ap)
+	int pri;
+	register const char *fmt;
+	va_list ap;
+{
+	struct tm now_tm;
+	time_t now;
+	int fd;
+	FILE *f;
+	char *buf = 0;
+	size_t bufsize = 0;
+	size_t prioff, 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;
+	}
+
+	/* Check priority against setlogmask values. */
+	if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0)
+		return;
+
+	/* 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);
+	    prioff = fprintf (f, "<%d>", pri);
+	    (void) 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);
+	    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 (f, fmt, ap);
+
+	    /* Close the memory stream; this will finalize the data
+	       into a malloc'd buffer in BUF.  */
+	    fclose (f);
+	  }
+
+	/* Output to stderr if requested. */
+	if (LogStat & LOG_PERROR) {
+		struct iovec iov[2];
+		register 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;
+		  }
+
+		__libc_cleanup_push (free, buf == failbuf ? NULL : buf);
+
+		/* writev is a cancellation point.  */
+		(void)__writev(STDERR_FILENO, iov, v - iov + 1);
+
+		__libc_cleanup_pop (0);
+	}
+
+	/* Prepare for multiple users.  We have to take care: open and
+	   write are cancellation points.  */
+	struct cleanup_arg clarg;
+	clarg.buf = buf;
+	clarg.oldaction = NULL;
+	__libc_cleanup_push (cancel_handler, &clarg);
+	__libc_lock_lock (syslog_lock);
+
+#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
+
+	/* End of critical section.  */
+	__libc_cleanup_pop (0);
+	__libc_lock_unlock (syslog_lock);
+
+	if (buf != failbuf)
+		free (buf);
+}
+libc_hidden_def (vsyslog)
+
+static struct sockaddr SyslogAddr;	/* AF_UNIX address of local logger */
+
+
+static void
+internal_function
+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.sa_family = AF_UNIX;
+			(void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
+				      sizeof(SyslogAddr.sa_data));
+			if (LogStat & LOG_NDELAY) {
+				if ((LogFile = __socket(AF_UNIX, LogType, 0))
+				    == -1)
+					return;
+				(void)__fcntl(LogFile, F_SETFD, 1);
+			}
+		}
+		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()
+{
+  if (!connected)
+    return;
+
+  __close (LogFile);
+  LogFile = -1;
+  connected = 0;
+}
+
+void
+closelog ()
+{
+  /* 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(pmask)
+	int pmask;
+{
+	int omask;
+
+	omask = LogMask;
+	if (pmask != 0)
+		LogMask = pmask;
+	return (omask);
+}
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index f499a712c4..39b980e898 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -1,6 +1,6 @@
 /* Set flags signalling availability of kernel features based on given
    kernel version number.
-   Copyright (C) 1999-2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1999-2003, 2004, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -79,6 +79,11 @@
 # define __ASSUME_SIOCGIFNAME		1
 #endif
 
+/* MSG_NOSIGNAL was at least available with Linux 2.3.15.  */
+#if __LINUX_KERNEL_VERSION >= 131855
+# define __ASSUME_MSG_NOSIGNAL		1
+#endif
+
 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
 # define __ASSUME_NEW_GETRLIMIT_SYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/syslog.c b/sysdeps/unix/sysv/linux/syslog.c
new file mode 100644
index 0000000000..eaaa9839dc
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/syslog.c
@@ -0,0 +1,10 @@
+#include "kernel-features.h"
+
+#if __ASSUME_MSG_NOSIGNAL
+# define NO_SIGPIPE
+# define send_flags MSG_NOSIGNAL
+#else
+# define send_flags 0
+#endif
+
+#include <sysdeps/generic/syslog.c>