/*
 * 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 2005 Sun Microsystems, Inc.  All rights reserved.
 *      Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

/*
 * openchild.c
 *
 * Open two pipes to a child process, one for reading, one for writing.
 * The pipes are accessed by FILE pointers. This is NOT a public
 * interface, but for internal use only!
 */
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

static char *basename(char *);
static char SHELL[] = "/bin/sh";

/*
 * returns pid, or -1 for failure
 */
int
_openchild(char *command, FILE **fto, FILE **ffrom)
{
        int i;
        int pid;
        int pdto[2];
        int pdfrom[2];
        char *com;


        if (pipe(pdto) < 0) {
                goto error1;
        }
        if (pipe(pdfrom) < 0) {
                goto error2;
        }
        switch (pid = fork()) {
        case -1:
                goto error3;

        case 0:
                /*
                 * child: read from pdto[0], write into pdfrom[1]
                 */
                (void) close(0);
                (void) dup(pdto[0]);
                (void) close(1);
                (void) dup(pdfrom[1]);

                /*
                 * adding this closelog for bug id 1238429
                 */
                closelog();
                closefrom(3);

                com = malloc((unsigned)strlen(command) + 6);
                if (com == NULL) {
                        exit(1);
                }
                (void) sprintf(com, "exec %s", command);
                execl(SHELL, basename(SHELL), "-c", com, NULL);
                exit(1);

        default:
                /*
                 * parent: write into pdto[1], read from pdfrom[0]
                 */
                *fto = fdopen(pdto[1], "w");
                (void) close(pdto[0]);
                *ffrom = fdopen(pdfrom[0], "r");
                (void) close(pdfrom[1]);
                break;
        }
        return (pid);

        /*
         * error cleanup and return
         */
error3:
printf("openchild: error3");
        (void) close(pdfrom[0]);
        (void) close(pdfrom[1]);
error2:
printf("openchild: error2");
        (void) close(pdto[0]);
        (void) close(pdto[1]);
error1:
printf("openchild: error1");
        return (-1);
}

static char *
basename(char *path)
{
        char *p;

        p = strrchr(path, '/');
        if (p == NULL) {
                return (path);
        } else {
                return (p + 1);
        }
}