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/*
Anacron - run commands periodically
Copyright (C) 1998 Itai Tzur <itzur@actcom.co.il>
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
The GNU General Public License can also be found in the file
`COPYING' that comes with the Anacron source distribution.
*/
/* Error logging
*
* We have two levels of logging (plus debugging if DEBUG is defined):
* "explain" level for informational messages, and "complain" level for errors.
*
* We log everything to syslog, see the top of global.h for relevant
* definitions.
*
* Stderr gets "complain" messages when we're in the foreground,
* and "explain" messages when we're in the foreground, and not "quiet".
*/
#include <unistd.h>
#include <syslog.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <string.h>
#include "global.h"
static char truncated[]=" (truncated)";
static char msg[MAX_MSG+1];
static int log_open=0;
static void
xopenlog()
{
if (!log_open) {
openlog(program_name,LOG_PID,SYSLOG_FACILITY);
log_open=1;
}
}
void
xcloselog()
{
if (log_open) closelog();
log_open=0;
}
static void
make_msg(char *fmt, va_list args)
/* Construct the message string from its parts */
{
int len;
/* There's some confusion in the documentation about what vsnprintf
* returns when the buffer overflows. Hmmm... */
len=vsnprintf(msg,sizeof(msg),fmt,args);
if (len>=sizeof(msg)-1)
strcpy(msg+sizeof(msg)-sizeof(truncated),truncated);
}
static void
log(int priority,char *fmt,va_list args)
/* Log a message, described by "fmt" and "args", with the specified
* "priority". */
{
make_msg(fmt,args);
xopenlog();
syslog(priority,"%s",msg);
if (!in_background)
if (priority==EXPLAIN_LEVEL && !quiet)
fprintf(stderr,"%s\n",msg);
else if (priority==COMPLAIN_LEVEL)
fprintf(stderr,"%s: %s\n",program_name,msg);
}
static void
log_e(int priority,char *fmt,va_list args)
/* Same as log(), but also appends an error description corresponding
* to "errno". */
{
int saved_errno;
saved_errno=errno;
make_msg(fmt,args);
xopenlog();
syslog(priority,"%s: %s",msg,strerror(saved_errno));
if (!in_background)
if (priority==EXPLAIN_LEVEL && !quiet)
fprintf(stderr,"%s: %s\n",msg,strerror(saved_errno));
else if (priority==COMPLAIN_LEVEL)
fprintf(stderr,"%s: %s: %s\n",
program_name,msg,strerror(saved_errno));
}
void
explain(char *fmt, ...)
/* Log an "explain" level message */
{
va_list args;
va_start(args,fmt);
log(EXPLAIN_LEVEL,fmt,args);
va_end(args);
}
void
explain_e(char *fmt, ...)
/* Log an "explain" level message, with an error description */
{
va_list args;
va_start(args,fmt);
log_e(EXPLAIN_LEVEL,fmt,args);
va_end(args);
}
void
complain(char *fmt, ...)
/* Log a "complain" level message */
{
va_list args;
va_start(args,fmt);
log(COMPLAIN_LEVEL,fmt,args);
va_end(args);
}
void
complain_e(char *fmt, ...)
/* Log a "complain" level message, with an error description */
{
va_list args;
va_start(args,fmt);
log_e(COMPLAIN_LEVEL,fmt,args);
va_end(args);
}
void
die(char *fmt, ...)
/* Log a "complain" level message, and exit */
{
va_list args;
va_start(args,fmt);
log(COMPLAIN_LEVEL,fmt,args);
va_end(args);
if (getpid()==primary_pid) complain("Aborted");
exit(FAILURE_EXIT);
}
void
die_e(char *fmt, ...)
/* Log a "complain" level message, with an error description, and exit */
{
va_list args;
va_start(args,fmt);
log_e(COMPLAIN_LEVEL,fmt,args);
va_end(args);
if (getpid()==primary_pid) complain("Aborted");
exit(FAILURE_EXIT);
}
#ifdef DEBUG
/* These are called through the Debug() and Debug_e() macros, defined
* in global.h */
void
xdebug(char *fmt, ...)
{
va_list args;
va_start(args,fmt);
log(DEBUG_LEVEL,fmt,args);
va_end(args);
}
void
xdebug_e(char *fmt, ...)
{
va_list args;
va_start(args,fmt);
log_e(DEBUG_LEVEL,fmt,args);
va_end(args);
}
#endif /* DEBUG */
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