/* ** $Id: errorlog.c,v 1.9 2003/09/04 03:46:47 weiym Exp $**** errorlog.c: Error routines for programs that can run as a daemon.**** Copyright (C) 2003 Feynman Software.** Copyright (C) 2000 ~ 2002 Wei Yongming.**** Some code come from APUE by Richard Stevens.**** Current maintainer: Wei Yongming.** Create date: 2000.12.31*//*** 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*//*** TODO:*/ #include	<errno.h>		/* for definition of errno */#include	<stdarg.h>		/* ANSI C header file */#include	<syslog.h>#include	"common.h"#ifdef _DEBUG#include	"ourhdr.h"static void	log_doit(int, int, const char *, va_list ap);#ifdef _DEBUGstatic int debug = 0;	/* caller must define and set this:						   nonzero if interactive, zero if daemon */#endif/* Initialize syslog(), if running as daemon. */voidlog_open(const char *ident, int option, int facility){	if (debug == 0)		openlog(ident, option, facility);}/* Nonfatal error related to a system call. * Print a message with the system's errno value and return. */voidlog_ret(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	log_doit(1, LOG_ERR, fmt, ap);	va_end(ap);	return;}/* Fatal error related to a system call. * Print a message and terminate. */voidlog_sys(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	log_doit(1, LOG_ERR, fmt, ap);	va_end(ap);	exit(2);}/* Nonfatal error unrelated to a system call. * Print a message and return. */voidlog_msg(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	log_doit(0, LOG_ERR, fmt, ap);	va_end(ap);	return;}/* Fatal error unrelated to a system call. * Print a message and terminate. */voidlog_quit(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	log_doit(0, LOG_ERR, fmt, ap);	va_end(ap);	exit(2);}/* Print a message and return to caller. * Caller specifies "errnoflag" and "priority". */static voidlog_doit(int errnoflag, int priority, const char *fmt, va_list ap){	int		errno_save;	char	buf[MAXLINE];	errno_save = errno;		/* value caller might want printed */	vsprintf(buf, fmt, ap);	if (errnoflag)		sprintf(buf+strlen(buf), ": %s", strerror(errno_save));	strcat(buf, "\n");	if (debug) {		fflush(stdout);		fputs(buf, stderr);		fflush(stderr);	} else		syslog(priority, buf);	return;}#endif /* _DEBUG */