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/**
* @file error_msg.c Error Handling Functions
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#ifndef MAXLINE
#define MAXLINE 4096
#endif
int daemon_proc; /* set nonzero by daemon_init() */
int ganglia_quiet_errors = 0;
static void err_doit (int, int, const char *, va_list);
void
err_quiet( void )
{
ganglia_quiet_errors = 1;
}
void
err_verbose( void )
{
ganglia_quiet_errors = 0;
}
/**
* @fn void err_ret (const char *fmt, ...)
* Print a message and return. Nonfatal error related to a system call.
* @param fmt Format string the same as printf function
* @param ... Arguments for the format string
*/
void
err_ret (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
err_doit (1, LOG_INFO, fmt, ap);
va_end (ap);
return;
}
/**
* @fn void err_sys (const char *fmt, ...)
* Print a message and terminate.
* Fatal error related to a system call.
* @param fmt Format string the same as printf function
* @param ... Arguments for the format string
*/
void
err_sys (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
err_doit (1, LOG_ERR, fmt, ap);
va_end (ap);
exit (1);
}
/**
* @fn void err_dump (const char *fmt, ...)
* Print a message, dump core, and terminate.
* Fatal error related to a system call.
* @param fmt Format string the same as printf function
* @param ... Arguments for the format string
*/
void
err_dump (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
err_doit (1, LOG_ERR, fmt, ap);
va_end (ap);
abort (); /* dump core and terminate */
exit (1); /* shouldn't get here */
}
/**
* @fn void err_msg (const char *fmt, ...)
* Print a message and return. Nonfatal error unrelated to a system call.
* @param fmt Format string the same as printf function
* @param ... Arguments for the format string
*/
void
err_msg (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
err_doit (0, LOG_INFO, fmt, ap);
va_end (ap);
return;
}
/**
* @fn void err_quit (const char *fmt, ...)
* Print a message and terminate. Fatal error unrelated to a system call.
* @param fmt Format string the same as printf function
* @param ... Arguments for the format string
*/
void
err_quit (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
err_doit (0, LOG_ERR, fmt, ap);
va_end (ap);
exit (1);
}
/* Print a message and return to caller.
* Caller specifies "errnoflag" and "level". */
static void
err_doit (int errnoflag, int level, const char *fmt, va_list ap)
{
int errno_save, n;
char buf[MAXLINE + 1];
if(ganglia_quiet_errors)
return;
errno_save = errno; /* value caller might want printed */
#ifdef HAVE_VSNPRINTF
vsnprintf (buf, MAXLINE, fmt, ap); /* safe */
#else
vsprintf (buf, fmt, ap); /* not safe */
#endif
n = strlen (buf);
if (errnoflag)
snprintf (buf + n, MAXLINE - n, ": %s", strerror (errno_save));
#ifdef HAVE_STRLCAT
strlcat (buf, "\n", MAXLINE);
#else
strcat (buf, "\n");
#endif
if (daemon_proc)
{
syslog (level, "%s", buf);
}
else
{
fflush (stdout); /* in case stdout and stderr are the same */
fputs (buf, stderr);
fflush (stderr);
}
return;
}
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