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e671cd59 PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
11bc5fe4 | 3 | Copyright 2017-2020 Free Software Foundation, Inc. |
e671cd59 PA |
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 3 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, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <unistd.h> | |
19 | #include <stdlib.h> | |
20 | #include <assert.h> | |
21 | ||
22 | static void | |
23 | daemon_main (void) | |
24 | { | |
25 | } | |
26 | ||
27 | int | |
28 | main () | |
29 | { | |
30 | pid_t child; | |
31 | ||
32 | alarm (60); | |
33 | ||
34 | /* Normally we're a progress group leader at this point, so can't | |
35 | create a session. Fork so the child can create a new | |
36 | session. */ | |
37 | child = fork (); | |
38 | if (child == -1) | |
39 | return 1; | |
40 | else if (child != 0) | |
41 | return 0; | |
42 | else | |
43 | { | |
44 | /* In child. Switch to a new session. */ | |
45 | pid_t session = setsid (); | |
46 | if (session == -1) | |
47 | return 1; | |
48 | ||
49 | /* Fork again, so that the grand child (what we want to debug) | |
50 | can't accidentally acquire a controlling terminal, because | |
51 | it's not a session leader. We're not opening any file here, | |
52 | but this is representative of what daemons do. */ | |
53 | child = fork (); | |
54 | if (child == -1) | |
55 | return 1; | |
56 | else if (child != 0) | |
57 | return 0; | |
58 | ||
59 | /* In grandchild. */ | |
60 | daemon_main (); | |
61 | ||
62 | while (1) | |
63 | sleep (1); | |
64 | } | |
65 | ||
66 | return 0; | |
67 | } |