masqmail

view src/child.c @ 410:cff967b2f51e

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Minor comment rework.
author markus schnalke <meillo@marmaro.de>
date Wed, 29 Feb 2012 12:05:47 +0100
parents 0ca270ca11fa
children
line source
1 /*
2 ** child.c
3 ** Copyright (C) 2000 by Oliver Kurth,
4 **
5 ** This program is free software; you can redistribute it and/or modify
6 ** it under the terms of the GNU General Public License as published by
7 ** the Free Software Foundation; either version 2 of the License, or
8 ** (at your option) any later version.
9 **
10 ** This program is distributed in the hope that it will be useful,
11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ** GNU General Public License for more details.
14 **
15 ** You should have received a copy of the GNU General Public License
16 ** along with this program; if not, write to the Free Software
17 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include <errno.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 #include <signal.h>
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <syslog.h>
28 #include <string.h>
29
30 #include "masqmail.h"
31
32
33 int
34 child(const char *command)
35 {
36 int pipe[2];
37
38 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
39 pid_t pid;
40
41 pid = fork();
42 if (pid == -1) {
43 return -1;
44
45 } else if (pid == 0) {
46 /* child */
47 char *argv[] = { "/bin/sh", "-c", (char *)command,
48 NULL };
49 int i, max_fd = sysconf(_SC_OPEN_MAX);
50
51 dup2(pipe[0], 0);
52 dup2(pipe[0], 1);
53 dup2(pipe[0], 2);
54
55 if (max_fd <= 0) {
56 max_fd = 64;
57 }
58 for (i = 3; i < max_fd; i++) {
59 close(i);
60 }
61 execve(*argv, argv, NULL);
62 logwrite(LOG_ALERT, "execve failed: %s\n",
63 strerror(errno));
64 _exit(1);
65
66 } else {
67 /* parent */
68 close(pipe[0]);
69 return pipe[1];
70 }
71 }
72 return -2;
73 }