2 * Copyright (c) 1998 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 RCSID("$Id: simple_exec.c,v 1.10 2001/06/21 03:38:03 assar Exp $");
41 #ifdef HAVE_SYS_TYPES_H
42 #include <sys/types.h>
44 #ifdef HAVE_SYS_WAIT_H
55 #define EX_NOTFOUND 127
58 -1 on `unspecified' system errors
61 0- is return value from subprocess
62 126 if the program couldn't be executed
63 127 if the program couldn't be found
64 128- is 128 + signal that killed subprocess
68 wait_for_process(pid_t pid)
73 while(waitpid(pid, &status, 0) < 0)
76 if(WIFSTOPPED(status))
79 return WEXITSTATUS(status);
80 if(WIFSIGNALED(status))
81 return WTERMSIG(status) + 128;
86 pipe_execv(FILE **stdin_fd, FILE **stdout_fd, FILE **stderr_fd,
87 const char *file, ...)
89 int in_fd[2], out_fd[2], err_fd[2];
104 argv = vstrcollect(&ap);
109 /* close pipes we're not interested in */
112 if(stdout_fd != NULL)
114 if(stderr_fd != NULL)
117 /* pipe everything caller doesn't care about to /dev/null */
119 in_fd[0] = open(_PATH_DEVNULL, O_RDONLY);
120 if(stdout_fd == NULL)
121 out_fd[1] = open(_PATH_DEVNULL, O_WRONLY);
122 if(stderr_fd == NULL)
123 err_fd[1] = open(_PATH_DEVNULL, O_WRONLY);
125 /* move to proper descriptors */
126 if(in_fd[0] != STDIN_FILENO) {
127 dup2(in_fd[0], STDIN_FILENO);
130 if(out_fd[1] != STDOUT_FILENO) {
131 dup2(out_fd[1], STDOUT_FILENO);
134 if(err_fd[1] != STDERR_FILENO) {
135 dup2(err_fd[1], STDERR_FILENO);
140 exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
142 if(stdin_fd != NULL) {
146 if(stdout_fd != NULL) {
150 if(stderr_fd != NULL) {
156 if(stdin_fd != NULL) {
158 *stdin_fd = fdopen(in_fd[1], "w");
160 if(stdout_fd != NULL) {
162 *stdout_fd = fdopen(out_fd[0], "r");
164 if(stderr_fd != NULL) {
166 *stderr_fd = fdopen(err_fd[0], "r");
173 simple_execvp(const char *file, char *const args[])
181 exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
183 return wait_for_process(pid);
187 /* gee, I'd like a execvpe */
189 simple_execve(const char *file, char *const args[], char *const envp[])
196 execve(file, args, envp);
197 exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
199 return wait_for_process(pid);
204 simple_execlp(const char *file, ...)
211 argv = vstrcollect(&ap);
215 ret = simple_execvp(file, argv);
221 simple_execle(const char *file, ... /* ,char *const envp[] */)
229 argv = vstrcollect(&ap);
230 envp = va_arg(ap, char **);
234 ret = simple_execve(file, argv, envp);
240 simple_execl(const char *file, ...)
247 argv = vstrcollect(&ap);
251 ret = simple_execve(file, argv, environ);