error.c

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/**
 * Error handling
 * Library: joedog
 *
 * Copyright (C) 2000, 2001, 2002 by
 * Jeffrey Fulmer - <[e-mail]>
 * This file is distributed as part of Siege 
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.   
 *  
 */

#ifdef  HAVE_CONFIG_H
# include <config.h>
#endif/*HAVE_CONFIG_H*/

#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>

#define BUFSIZE 4096

static void   log_message( int status, const char *mode, const char *fmt, va_list ap );
static void error_message( int status, const char *mode, const char *fmt, va_list ap );

void
joe_openlog( char *program )
{
  openlog( program, LOG_PID, LOG_DAEMON ); 
  return;
}

void 
joe_closelog( void )
{
  closelog();
  return;
}

/**
 *  error_message    program centric error message
 */
void 
log_message( int status, const char *mode, const char *fmt, va_list ap )
{
  char buf[BUFSIZE];


  vsprintf( buf, fmt, ap );
  if( errno == 0 )
    sprintf( buf + strlen( buf ), "\n" );
  else
    sprintf( buf + strlen( buf ), ": %s\n", strerror(errno)); 

  syslog( LOG_ERR, "%s: %s", mode, buf );

  if( status >= 0 ){ exit( status ); }
  return;
}

/**
 *  error_message    program centric error message
 */
void
error_message( int status, const char *mode, const char *fmt, va_list ap )
{
  char buf[BUFSIZE/2];
  char msg[BUFSIZE];

  vsprintf( buf, fmt, ap );
  if( errno == 0 || errno == ENOSYS )
    snprintf( msg, sizeof( msg ), "%s\n", buf );
  else
    snprintf( msg, sizeof( msg ), "%s: %s\n", buf, strerror(errno));

  fflush( stdout );
  fprintf( stderr, "%s: %s", mode, msg );

  if( status >= 0 ){ exit( status ); }
  return;
}


/**
 *  log_warning but continue...
 */
void 
log_warning( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );
  
  /** 
   * -1, no exit 
   */
  log_message( -1, "warning", fmt, ap );
  va_end( ap );
  
  return;
}

/**
 *  joe_warning warn the user but continue to run
 */
void
joe_warning( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );

  /** 
   * -1, no exit 
   */
  error_message( -1, "warning", fmt, ap );
  va_end( ap );

  return;
}

/** 
 * log_error    signal error but continue to run
 */
void 
log_error( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );

  /** 
   * -1, no exit 
   */
  log_message( -1, "Error", fmt, ap );
  va_end( ap );

  return;
}

/** 
 * joe_error    signal error but continue to run
 */
void
joe_error( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );

  /** 
   * -1, no exit 
   */
  error_message( -1, "Error", fmt, ap );
  va_end( ap );

  return;
}


/**
 *  log_fatal   EXIT on fatal condition
 */
void 
log_fatal( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );

  /** 
   * 1, print message and exit 
   */
  log_message( 1, "FATAL", fmt, ap );
  va_end( ap );

  return;
}


/**
 *  joe_fatal   EXIT on fatal condition
 */
void
joe_fatal( const char *fmt, ... )
{
  va_list ap;
  va_start( ap, fmt );

  /** 
   * 1, print message and exit 
   */
  error_message( 1, "FATAL", fmt, ap );
  va_end( ap );

  return;
}