errorlog.c

在ADS环境下MiniGUI的源码

/* 
** $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 _DEBUG
static int debug = 0;	/* caller must define and set this:
						   nonzero if interactive, zero if daemon */
#endif

/* Initialize syslog(), if running as daemon. */

void
log_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. */

void
log_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. */

void
log_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. */

void
log_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. */

void
log_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 void
log_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 */