[497] in Pthreads mailing list archive
syslog for pthreads
daemon@ATHENA.MIT.EDU (Stewart Gebbie)
Wed Nov 13 02:42:30 1996
Date: Wed, 13 Nov 1996 09:13:52 -0200 (GMT)
From: Stewart Gebbie <stewart@lin01.global.co.za>
To: pthreads@MIT.EDU
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Content-ID: <Pine.SOL.3.91.961113091222.3167C@lin01.global.co.za>
Hi,
I had problems getting syslog to work. But I have now fixed the problem.
It appears that syslogd listens to /dev/log and to port 514. For some or
other reason things don't always seem to work if one connects to /dev/log.
(I am still not sure why, if anyone knows I would appreciate to find out).
But if one defaults to port 514 then on my machine (Linux 2.0.0) syslog
now works.
Attached is the fix for the pthread syslog.
stewart
/**************************************************************************
Stewart Gebbie
(H)+27 11 4323196 ``Only the ignorant man becomes angry.
(W)+27 11 6821895 The wise man understands.''
stewart@global.co.za
**************************************************************************/
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Content-Type: TEXT/PLAIN; CHARSET=us-ascii; NAME="syslog.c"; SIZEONDISK=5785
Content-ID: <Pine.SOL.3.91.961113091222.3167D@lin01.global.co.za>
Content-Description: syslog.c
/*
* Copyright (c) 1983, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c 5.14 (Berkeley) 5/20/88";
#endif /* LIBC_SCCS and not lint */
/*
* SYSLOG -- print message on log file
*
* This routine looks a lot like printf, except that it
* outputs to the log file instead of the standard output.
* Also:
* adds a timestamp,
* prints the module name in front of the message,
* has some other formatting types (or will sometime),
* adds a newline on the end of the message.
*
* The output of this routine is intended to be read by /etc/syslogd.
*
* Author: Eric Allman
* Modified to use UNIX domain IPC by Ralph Campbell
* Modified for pthreads and made more POSIX-compliant by Greg Hudson
* Modified to use INET domain by Stewart Gebbie (13/11/96)
*/
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <signal.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
int socket();
char *strerror(int); /* For systems that don't prototype it */
#define MAXLINE 1024 /* max message size */
#define PRIFAC(p) (((p) & LOG_FACMASK) >> 3)
/* XXX should be in <syslog.h> */
#define IMPORTANT LOG_ERR
static void basic_init(void);
static char _log_name[] = "/dev/log";
static char ctty[] = "/dev/console";
static int _port_syslog = 514;
static int LogFile = -1; /* fd for log */
static int LogStat = 0; /* status bits, set by openlog() */
static char *LogTag = "syslog"; /* string to tag the entry with */
static int LogMask = 0xff; /* mask of priorities to be logged */
static int LogFacility = LOG_USER; /* default facility code */
static pthread_mutex_t basic_init_lock = PTHREAD_MUTEX_INITIALIZER;
static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
static void basic_init()
{
pthread_mutex_lock(&basic_init_lock);
if (LogFile < 0)
openlog(LogTag, LogStat | LOG_NDELAY, 0);
pthread_mutex_unlock(&basic_init_lock);
}
void syslog(int pri, char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vsyslog(pri, fmt, args);
va_end(args);
}
void vsyslog(int pri, char *fmt, va_list args)
{
char buf[MAXLINE + 1], outline[MAXLINE + 1];
register char *b, *f, *o;
register int c;
time_t now;
int olderrno = errno, fd;
/* Do a basic initialization if user didn't call openlog(). */
if (LogFile < 0)
basic_init();
/* see if we should just throw out this message */
if ((unsigned) PRIFAC(pri) >= LOG_NFACILITIES ||
(LOG_MASK(pri & LOG_PRIMASK) & LogMask) == 0 ||
(pri &~ (LOG_PRIMASK|LOG_FACMASK)) != 0)
return;
/* set default facility if none specified */
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
/* build the message */
o = outline;
(void)sprintf(o, "<%d>", pri);
o += strlen(o);
time(&now);
(void)sprintf(o, "%.15s ", ctime(&now) + 4);
o += strlen(o);
if (LogTag) {
strcpy(o, LogTag);
o += strlen(o);
}
if (LogStat & LOG_PID) {
(void)sprintf(o, "[%d]", getpid());
o += strlen(o);
}
if (LogTag) {
strcpy(o, ": ");
o += 2;
}
b = buf;
f = fmt;
while ((c = *f++) != '\0' && c != '\n' && b < &buf[MAXLINE]) {
char *strerror();
if (c != '%') {
*b++ = c;
continue;
}
if ((c = *f++) != 'm') {
*b++ = '%';
*b++ = c;
continue;
}
strcpy(b, strerror(olderrno));
b += strlen(b);
}
*b++ = '\n';
*b = '\0';
vsprintf(o, buf, args);
c = strlen(outline);
if (c > MAXLINE)
c = MAXLINE;
/* output the message to the local logger */
if (sendto(LogFile, outline, c, 0, &SyslogAddr, sizeof SyslogAddr) >= 0)
return;
if (!(LogStat & LOG_CONS))
return;
/* output the message to the console */
fd = open(ctty, O_WRONLY);
alarm(0);
strcat(o, "\r");
o = strchr(outline, '>') + 1;
write(fd, o, c + 1 - (o - outline));
close(fd);
}
/*
* OPENLOG -- open system log
*/
void openlog(char *ident, int logstat, int logfac)
{
int flags;
if (ident != NULL)
LogTag = ident;
LogStat = logstat;
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
LogFacility = logfac;
if (LogFile >= 0)
return;
#ifdef AF_INET
if (LogFile <0 ) {
if (LogStat & LOG_NDELAY)
{
struct servent* sp =
getservbyname("syslog", "udp");
struct sockaddr_in* sin =
(struct sockaddr_in*) &SyslogAddr;
sin->sin_family = AF_INET;
if (sp)
sin->sin_port = sp->s_port;
else
sin->sin_port = htons(_port_syslog);
sin->sin_addr.s_addr = htonl(INADDR_ANY);
LogFile = socket(AF_INET, SOCK_DGRAM, 0);
}
}
#endif
#ifdef AF_UNIX
if (LogFile <0 ) {
SyslogAddr.sa_family = AF_UNIX;
(void) strncpy(SyslogAddr.sa_data, _log_name,
sizeof(SyslogAddr.sa_data));
if (LogStat & LOG_NDELAY)
{
LogFile = socket(AF_UNIX, SOCK_DGRAM, 0);
}
}
#endif
if(LogFile>=0)
{
flags = fcntl(LogFile, F_GETFD);
fcntl(LogFile, F_SETFD, flags & O_NONBLOCK);
}
}
/*
* CLOSELOG -- close the system log
*/
void closelog()
{
(void) close(LogFile);
LogFile = -1;
}
/*
* SETLOGMASK -- set the log mask level
*/
int setlogmask(int pmask)
{
int omask;
omask = LogMask;
if (pmask != 0)
LogMask = pmask;
return (omask);
}
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