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mlog.c
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mlog.c
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/*
* $Id$
*
* (C) Copyright IBM Corp. 2003, 2004
*
* THIS FILE IS PROVIDED UNDER THE TERMS OF THE ECLIPSE PUBLIC LICENSE
* ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THIS FILE
* CONSTITUTES RECIPIENTS ACCEPTANCE OF THE AGREEMENT.
*
* You can obtain a current copy of the Eclipse Public License from
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* Author: Viktor Mihajlovski <mihajlov@de.ibm.cim>
* Contributors: Michael Schuele <schuelem@de.ibm.com>
* Anas Nashif <nashif@planux.com>
*
* Description: Logger support.
*
*/
const char *_mlog_id = "$Id$";
#include "mlog.h"
#include "msgqueue.h"
#include <syslog.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include "trace.h" /* for setSignal() */
#include <sys/wait.h>
// Macro to open the syslog
#define OPENLOG(level) openlog("sfcb", LOG_PID, LOG_DAEMON); setlogmask(LOG_UPTO(level));
FILE *log_w_stream;
int logfds[2] = { 0, 0 };
/*
+ * main function for the logger proc. Waits on a pipe and writes to syslog
+ * Will exit when the other side of the pipe closes
+ */
void runLogger(int listenFd, int level) {
FILE *stream;
int priosysl;
char buf[LOG_MSG_MAX];
OPENLOG(level);
stream = fdopen(listenFd, "r");
while (!feof(stream)) {
fgets(buf, sizeof(buf), stream);
int priority = buf[0];
switch (priority) {
case M_DEBUG:
priosysl = LOG_DEBUG;
break;
case M_INFO:
priosysl = LOG_INFO;
break;
case M_ERROR:
default:
priosysl = LOG_ERR;
break;
}
syslog(priosysl, "%s", buf + 1);
}
return;
}
/*
* sets up the logging pipe and forks off the logger process
*/
void startLogging(int level, int thread) {
// if we're a client, just open the log and
// don't start a logger.
if (! thread ) {
OPENLOG(level);
return;
}
pipe(logfds);
int lpid;
lpid = fork();
if (lpid == 0) {
close(logfds[1]); /* close write end */
setSignal(SIGINT, SIG_IGN, 0);
setSignal(SIGTERM, SIG_IGN, 0);
setSignal(SIGHUP, SIG_IGN, 0);
runLogger(logfds[0], level);
close(logfds[0]);
exit(0);
} else if (lpid > 0) {
close(logfds[0]); /* close read end */
log_w_stream = fdopen(logfds[1], "w");
return;
} else {
fprintf(stderr, "*** fork of logger proc failed\n");
abort();
}
}
/** \brief closeLogging - Closes down logging
*
* Closes the pipe used for logging and closes out
* the syslog services that are created in startLogging.
*/
void closeLogging() {
int wstat;
closelog();
close(logfds[1]);
wait(&wstat); // wait to prevent zombie
}
/** \brief mlogf - Create syslog entries
*
* This should be called with a format string in fmt, with
* the variables to be inserted in it as the arguments
* following (...)
* eg
* mlogf(M_ERROR,M_SHOW,"--- %s failed rc=%d\n",oper,rc);
*
* Don't allow user input into the format string as it
* is not to be trusted. No need to use sprintf to build
* the string before passing it to mlogf.
*/
void mlogf(int priority, int errout, const char *fmt, ...) {
va_list ap;
char buf[LOG_MSG_MAX];
va_start(ap, fmt);
// Leave a space for the /n on the end.
vsnprintf(buf, LOG_MSG_MAX-1, fmt, ap);
// Now check to make sure we have a /n at the end
int buflen=strlen(buf);
if ( buf[buflen-1] != '\n' ) {
strcat(buf,"\n");
}
/*
* we sometimes call mlogf when sfcbd isn't started (i.e. via
* sfcbinst2mof)
*/
if (logfds[1] == 0) {
fprintf(stderr, "logger not started");
int priosysl;
switch (priority) {
case M_DEBUG:
priosysl = LOG_DEBUG;
break;
case M_INFO:
priosysl = LOG_INFO;
break;
case M_ERROR:
default:
priosysl = LOG_ERR;
break;
}
syslog(priosysl, "%s", buf);
}
/*
* if sfcbd is started, the logger proc will be waiting to recv log msg
*/
else {
fprintf(log_w_stream, "%c%s", priority, buf);
fflush(log_w_stream);
}
/*
* also print out the logg message to stderr if M_SHOW was passed in
*/
if (errout) {
fprintf(stderr, "%s", buf);
}
va_end(ap);
}