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/* debug.c
*
* This file proides debug and run time error analysis support. Some of the
* settings are very performance intense and my be turned off during a release
* build.
*
* File begun on 2008-01-22 by RGerhards
*
* There is some in-depth documentation available in doc/dev_queue.html
* (and in the web doc set on http://www.rsyslog.com/doc). Be sure to read it
* if you are getting aquainted to the object.
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h" /* autotools! */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <pthread.h>
#include "rsyslog.h"
#include "debug.h"
/* static data (some time to be replaced) */
int Debug; /* debug flag - read-only after startup */
int debugging_on = 0; /* read-only, except on sig USR1 */
/* handler for SIGSEGV - MUST terminiate the app, but does so in a somewhat
* more meaningful way.
* rgerhards, 2008-01-22
*/
void
sigsegvHdlr(int signum)
{
struct sigaction sigAct;
char *signame;
if(signum == SIGSEGV) {
signame = " (SIGSEGV)";
} else {
signame = "";
}
fprintf(stderr, "Signal %d%s occured, execution must be terminated %d.\n", signum, signame, SIGSEGV);
fflush(stderr);
/* re-instantiate original handler ... */
memset(&sigAct, 0, sizeof (sigAct));
sigemptyset(&sigAct.sa_mask);
sigAct.sa_handler = SIG_DFL;
sigaction(SIGSEGV, &sigAct, NULL);
/* and call it */
int i= raise(signum);
printf("raise returns %d, errno %d: %s\n", i, errno, strerror(errno));
/* we should never arrive here - but we provide some code just in case... */
fprintf(stderr, "sigsegvHdlr: oops, returned from raise(), doing exit(), something really wrong...\n");
exit(1);
}
/* print some debug output */
void
dbgprintf(char *fmt, ...)
{
static pthread_t ptLastThrdID = 0;
static int bWasNL = 0;
va_list ap;
if ( !(Debug && debugging_on) )
return;
/* The bWasNL handler does not really work. It works if no thread
* switching occurs during non-NL messages. Else, things are messed
* up. Anyhow, it works well enough to provide useful help during
* getting this up and running. It is questionable if the extra effort
* is worth fixing it, giving the limited appliability.
* rgerhards, 2005-10-25
* I have decided that it is not worth fixing it - especially as it works
* pretty well.
* rgerhards, 2007-06-15
*/
if(ptLastThrdID != pthread_self()) {
if(!bWasNL) {
fprintf(stdout, "\n");
bWasNL = 1;
}
ptLastThrdID = pthread_self();
}
if(bWasNL) {
fprintf(stdout, "%8.8x: ", (unsigned int) pthread_self());
//fprintf(stderr, "%8.8x: ", (unsigned int) pthread_self());
}
bWasNL = (*(fmt + strlen(fmt) - 1) == '\n') ? 1 : 0;
va_start(ap, fmt);
vfprintf(stdout, fmt, ap);
//vfprintf(stderr, fmt, ap);
va_end(ap);
//fflush(stderr);
fflush(stdout);
return;
}
/* */
/*
* vi:set ai:
*/
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