masqmail

view src/child.c @ 221:8742d2cee364

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added a note to the long vs. int question in md5.h Solar Designer explained to me in privat conversation that the int had performed much better on some systems and that 16bit ints are very rare. Still I like using the long.
author meillo@marmaro.de
date Fri, 23 Jul 2010 10:53:04 +0200
parents 26e34ae9a3e3
children fc1c6425c024
line source
1 /* child.c, Copyright (C) 2000 by Oliver Kurth,
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 */
17
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <signal.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <syslog.h>
26 #include <string.h>
27
28 #include "masqmail.h"
29
30
31 int
32 child(const char *command)
33 {
34 int pipe[2];
35
36 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
37 pid_t pid;
38
39 pid = fork();
40 if (pid == 0) {
41 int i, max_fd = sysconf(_SC_OPEN_MAX);
42 /* child */
43 dup2(pipe[0], 0);
44 dup2(pipe[0], 1);
45 dup2(pipe[0], 2);
46
47 if (max_fd <= 0)
48 max_fd = 64;
49 for (i = 3; i < max_fd; i++)
50 close(i);
51
52 {
53 char *argv[] = { "/bin/sh", "-c", (char *) command, NULL };
54 execve(*argv, argv, NULL);
55 }
56 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
57 _exit(EXIT_FAILURE);
58 } else if (pid == -1) {
59 return -1;
60 } else {
61 close(pipe[0]);
62 return pipe[1];
63 }
64 }
65 return -2;
66 }