1 /* $NetBSD: fexec.c,v 1.1.1.3 2009/08/06 16:55:26 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 1.1.1.3 2009/08/06 16:55:26 joerg Exp $");
63
64 static 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 */
71 int
pfcexec(const char * path,const char * file,const char ** argv)72 pfcexec(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
101 static int
vfcexec(const char * path,int skipempty,const char * arg,va_list ap)102 vfcexec(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
130 int
fexec(const char * arg,...)131 fexec(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
143 int
fexec_skipempty(const char * arg,...)144 fexec_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
156 int
fcexec(const char * path,const char * arg,...)157 fcexec(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