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comparison dcclib/daemon.c @ 0:c7f6b056b673

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First import of vendor version
author Peter Gervai <grin@grin.hu>
date Tue, 10 Mar 2009 13:49:58 +0100
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-1:000000000000 0:c7f6b056b673
1 /* compatibility hack for old systems lacking daemon() */
2
3 #include "dcc_config.h"
4 #include "dcc_paths.h"
5
6 #include <stdio.h>
7 #include <unistd.h>
8 #include <stdlib.h>
9 #include <fcntl.h>
10
11 int
12 dcc_daemon(int nochdir, int noclose)
13 {
14 int retv;
15
16 if (!nochdir) {
17 if (chdir("/") == -1)
18 perror("chdir /");
19 }
20 retv = fork();
21 if (retv == -1)
22 return -1; /* fork() failed */
23
24 if (retv != 0)
25 _exit(0); /* parent of new child */
26
27 /* fork again after setsid() so that the PID is not the session
28 * group leader so that opening a tty device won't make a
29 * controlling terminal. */
30 setsid();
31 retv = fork();
32 if (retv == -1) {
33 perror("fork"); /* second fork() failed */
34 exit(1); /* cannot tell caller */
35 }
36 if (retv != 0)
37 _exit(0); /* parent of final child */
38
39 if (!noclose) {
40 close(0);
41 close(1);
42 close(2);
43 open(_PATH_DEVNULL, O_RDWR, 0666);
44 dup2(0, 1);
45 dup2(0, 2);
46 }
47 return 0;
48 }