1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* $Id: daemonize.C,v 1.4 2001/10/03 01:45:52 dm Exp $ */
/*
*
* Copyright (C) 1999 David Mazieres (dm@uun.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "async.h"
str syslog_priority ("daemon.notice");
static void
start_logger ()
{
#ifdef PATH_LOGGER
char *av[] = { PATH_LOGGER, "-p",
const_cast<char *> (syslog_priority.cstr ()),
"-t", "", NULL};
int fds[2];
if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) < 0)
fatal ("socketpair: %m\n");
close_on_exec (fds[0]);
if (fds[1] != 0)
close_on_exec (fds[1]);
if (spawn (PATH_LOGGER, av, fds[1]) >= 0) {
close (fds[1]);
if (fds[0] != errfd) {
err_flush (); // XXX - we shouldn't depend on aerr.C
if (dup2 (fds[0], errfd) < 0)
fatal ("dup2: %m\n");
close (fds[0]);
}
if (errfd != 1)
dup2 (errfd, 1);
close (0);
if (int fd = open ("/dev/null", O_RDONLY))
close (fd);
return;
}
else
warn ("%s: %m\n", PATH_LOGGER);
#endif /* PATH_LOGGER */
/* No logger, at least send chatter to stdout rather than stderr, so
* that it can be redirected. */
dup2 (errfd, 1);
}
void
daemonize ()
{
switch (fork ()) {
default:
_exit (0);
case -1:
fatal ("fork: %m\n");
case 0:
break;
}
if (setsid () < 0)
fatal ("setsid: %m\n");
if (!builddir) {
start_logger ();
str2file (strbuf () << PIDDIR << "/" << progname << ".pid",
strbuf ("%d\n", getpid ()), 0444);
}
else {
str piddir = buildtmpdir;
if (!piddir)
piddir = builddir;
str2file (strbuf () << buildtmpdir << "/" << progname << ".pid",
strbuf ("%d\n", getpid ()), 0444);
}
}
|
