/*-
 * Copyright (c) 1996
 *	David Parsons.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by David Parsons
 *      (orc@pell.chi.il.us)
 * 4. My name may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
static char rcsid[] = "$Header: /home/orc/src/CVS/listmgr/launch.c,v 1.4 1996/10/27 18:15:54 orc Exp $";

#include <stdio.h>
#include <syslog.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdarg.h>

/*
 * launch() fires off a program (usually sendmail) and redirects its stdin,
 * out, and error
 */
pid_t
launch(char *program, char **arglist, int STDIN, int STDOUT, int STDERR)
{
    pid_t pid;

    if ((pid = fork()) < 0)
	return pid;

    if (pid == 0) {
	/* refit standard file descriptors */
	if (STDIN != EOF && dup2(STDIN, 0) < 0)
	    critical_error("fitting stdin", errno);
	if (STDOUT != EOF && dup2(STDOUT, 1) < 0)
	    critical_error("fitting stdout", errno);
	if (STDERR != EOF && dup2(STDERR, 2) < 0)
	    critical_error("fitting stderr", errno);

	/* launch the program */
	execv(program, arglist);
	exit(-1);
    }
    return pid;
} /* launch */