1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 *	Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 *	Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30/*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35/*
36 * openchild.c
37 *
38 * Open two pipes to a child process, one for reading, one for writing.
39 * The pipes are accessed by FILE pointers. This is NOT a public
40 * interface, but for internal use only!
41 */
42#include <stdio.h>
43#include <stdlib.h>
44#include <strings.h>
45
46static char *basename(char *);
47static char SHELL[] = "/bin/sh";
48
49/*
50 * returns pid, or -1 for failure
51 */
52int
53_openchild(char *command, FILE **fto, FILE **ffrom)
54{
55	int i;
56	int pid;
57	int pdto[2];
58	int pdfrom[2];
59	char *com;
60
61
62	if (pipe(pdto) < 0) {
63		goto error1;
64	}
65	if (pipe(pdfrom) < 0) {
66		goto error2;
67	}
68	switch (pid = fork()) {
69	case -1:
70		goto error3;
71
72	case 0:
73		/*
74		 * child: read from pdto[0], write into pdfrom[1]
75		 */
76		(void) close(0);
77		(void) dup(pdto[0]);
78		(void) close(1);
79		(void) dup(pdfrom[1]);
80
81		/*
82		 * adding this closelog for bug id 1238429
83		 */
84		closelog();
85		closefrom(3);
86
87		com = malloc((unsigned)strlen(command) + 6);
88		if (com == NULL) {
89			exit(1);
90		}
91		(void) sprintf(com, "exec %s", command);
92		execl(SHELL, basename(SHELL), "-c", com, NULL);
93		exit(1);
94
95	default:
96		/*
97		 * parent: write into pdto[1], read from pdfrom[0]
98		 */
99		*fto = fdopen(pdto[1], "w");
100		(void) close(pdto[0]);
101		*ffrom = fdopen(pdfrom[0], "r");
102		(void) close(pdfrom[1]);
103		break;
104	}
105	return (pid);
106
107	/*
108	 * error cleanup and return
109	 */
110error3:
111printf("openchild: error3");
112	(void) close(pdfrom[0]);
113	(void) close(pdfrom[1]);
114error2:
115printf("openchild: error2");
116	(void) close(pdto[0]);
117	(void) close(pdto[1]);
118error1:
119printf("openchild: error1");
120	return (-1);
121}
122
123static char *
124basename(char *path)
125{
126	char *p;
127
128	p = strrchr(path, '/');
129	if (p == NULL) {
130		return (path);
131	} else {
132		return (p + 1);
133	}
134}
135