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
);