blob: 8ace624427ed4a5680d25913c0a0352ea874ad37 (
plain)
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
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2017-2023 Free Software Foundation, Inc.
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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
static void
daemon_main (void)
{
}
int
main ()
{
pid_t child;
alarm (60);
/* Normally we're a progress group leader at this point, so can't
create a session. Fork so the child can create a new
session. */
child = fork ();
if (child == -1)
return 1;
else if (child != 0)
return 0;
else
{
/* In child. Switch to a new session. */
pid_t session = setsid ();
if (session == -1)
return 1;
/* Fork again, so that the grand child (what we want to debug)
can't accidentally acquire a controlling terminal, because
it's not a session leader. We're not opening any file here,
but this is representative of what daemons do. */
child = fork ();
if (child == -1)
return 1;
else if (child != 0)
return 0;
/* In grandchild. */
daemon_main ();
while (1)
sleep (1);
}
return 0;
}
|
