masqmail

view src/child.c @ 0:08114f7dcc23

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this is masqmail-0.2.21 from oliver kurth
author meillo@marmaro.de
date Fri, 26 Sep 2008 17:05:23 +0200
parents
children 26e34ae9a3e3
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 int volatile sigchild_seen = 0;
31
32 static
33 void sigchild_handler(int sig)
34 {
35 sigchild_seen = 1;
36 signal(SIGHUP, sigchild_handler);
37 }
38
39 int child(const char *command)
40 {
41 int pipe[2];
42
43 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0){
44 pid_t pid;
45
46 /*
47 sigchild_seen = 0;
48 signal(SIGCHLD, sigchild_handler);
49 */
50
51 pid = fork();
52 if(pid == 0){
53 int i, max_fd = sysconf(_SC_OPEN_MAX);
54 /* child */
55 dup2(pipe[0], 0);
56 dup2(pipe[0], 1);
57 dup2(pipe[0], 2);
58
59 if(max_fd <= 0) max_fd = 64;
60 for(i = 3; i < max_fd; i++)
61 close(i);
62
63 {
64 char *argv [] = { "/bin/sh", "-c", (char*) command, NULL };
65 execve (*argv, argv, NULL);
66 }
67 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
68 _exit(EXIT_FAILURE);
69 }else if(pid == -1){
70 return -1;
71 }else{
72 close(pipe[0]);
73 return pipe[1];
74 }
75 }
76 return -2;
77 }
78
79