1/*	$NetBSD: fexec.c,v 1.12 2009/08/02 17:56:45 joerg Exp $	*/
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matthias Scheler.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32
33#if HAVE_CONFIG_H
34#include "config.h"
35#endif
36#include <nbcompat.h>
37#if HAVE_SYS_CDEFS_H
38#include <sys/cdefs.h>
39#endif
40#if HAVE_SYS_WAIT_H
41#include <sys/wait.h>
42#endif
43
44#if HAVE_ERR_H
45#include <err.h>
46#endif
47#if HAVE_ERRNO_H
48#include <errno.h>
49#endif
50#if HAVE_STDARG_H
51#include <stdarg.h>
52#endif
53#if HAVE_STDLIB_H
54#include <stdlib.h>
55#endif
56#if HAVE_UNISTD_H
57#include <unistd.h>
58#endif
59
60#include "lib.h"
61
62__RCSID("$NetBSD: fexec.c,v 1.12 2009/08/02 17:56:45 joerg Exp $");
63
64static int	vfcexec(const char *, int, const char *, va_list);
65
66/*
67 * fork, then change current working directory to path and
68 * execute the command and arguments in the argv array.
69 * wait for the command to finish, then return the exit status.
70 */
71int
72pfcexec(const char *path, const char *file, const char **argv)
73{
74	pid_t			child;
75	int			status;
76
77	child = vfork();
78	switch (child) {
79	case 0:
80		if ((path != NULL) && (chdir(path) < 0))
81			_exit(127);
82
83		(void)execvp(file, __UNCONST(argv));
84		_exit(127);
85		/* NOTREACHED */
86	case -1:
87		return -1;
88	}
89
90	while (waitpid(child, &status, 0) < 0) {
91		if (errno != EINTR)
92			return -1;
93	}
94
95	if (!WIFEXITED(status))
96		return -1;
97
98	return WEXITSTATUS(status);
99}
100
101static int
102vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
103{
104	const char **argv;
105	size_t argv_size, argc;
106	int retval;
107
108	argv_size = 16;
109	argv = xcalloc(argv_size, sizeof(*argv));
110
111	argv[0] = arg;
112	argc = 1;
113
114	do {
115		if (argc == argv_size) {
116			argv_size *= 2;
117			argv = xrealloc(argv, argv_size * sizeof(*argv));
118		}
119		arg = va_arg(ap, const char *);
120		if (skipempty && arg && strlen(arg) == 0)
121		    continue;
122		argv[argc++] = arg;
123	} while (arg != NULL);
124
125	retval = pfcexec(path, argv[0], argv);
126	free(argv);
127	return retval;
128}
129
130int
131fexec(const char *arg, ...)
132{
133	va_list	ap;
134	int	result;
135
136	va_start(ap, arg);
137	result = vfcexec(NULL, 0, arg, ap);
138	va_end(ap);
139
140	return result;
141}
142
143int
144fexec_skipempty(const char *arg, ...)
145{
146	va_list	ap;
147	int	result;
148
149	va_start(ap, arg);
150	result = vfcexec(NULL, 1, arg, ap);
151	va_end(ap);
152
153	return result;
154}
155
156int
157fcexec(const char *path, const char *arg, ...)
158{
159	va_list	ap;
160	int	result;
161
162	va_start(ap, arg);
163	result = vfcexec(path, 0, arg, ap);
164	va_end(ap);
165
166	return result;
167}
168