OpenSolaris_b135/cmd/bnu/shio.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1988 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/


#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "uucp.h"

/*
 * use shell to execute command with
 * fi, fo, and fe as standard input/output/error
 *	cmd 	-> command to execute
 *	fi 	-> standard input
 *	fo 	-> standard output
 *	fe 	-> standard error
 * return:
 *	0		-> success 
 *	non zero	-> failure  -  status from child
			(Note - -1 means the fork failed)
 */
int
shio(cmd, fi, fo, fe)
char *cmd, *fi, *fo, *fe;
{
	register pid_t pid, ret;
	int status;

	if (fi == NULL)
		fi = "/dev/null";
	if (fo == NULL)
		fo = "/dev/null";
	if (fe == NULL)
		fe = "/dev/null";

	DEBUG(3, "shio - %s\n", cmd);
	if ((pid = fork()) == 0) {
		(void) signal(SIGINT, SIG_IGN);
		(void) signal(SIGHUP, SIG_IGN);
		(void) signal(SIGQUIT, SIG_IGN);
		ucloselog();
		(void) close(Ifn);	/* close connection fd's */
		(void) close(Ofn);
		(void) close(0);	/* get stdin from file fi */
		if (open(fi, 0) != 0)
			exit(errno);
		(void) close(1);	/* divert stdout to fo */
		if (creat(fo, PUB_FILEMODE) != 1)
			exit(errno);
		(void) close(2);	/* divert stderr to fe */
		if (creat(fe, PUB_FILEMODE) != 2)
			exit(errno);
		(void) execle(SHELL, "sh", "-c", cmd, (char *) 0, Env);
		exit(100);
	}

	/*
	 * the status returned from wait can never be -1
	 * see man page wait(2)
	 * So we use the -1 value to indicate fork failed
	 * or the wait failed.
	 */
	if (pid == -1)
		return(-1);
	
	while ((ret = wait(&status)) != pid)
	    if (ret == -1 && errno != EINTR)
		return(-1);
	DEBUG(3, "status %d\n", status);
	return(status);
}