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a2077e25 PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
3666a048 | 3 | Copyright 2015-2021 Free Software Foundation, Inc. |
a2077e25 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 <stdio.h> | |
20 | #include <sys/types.h> | |
21 | #include <sys/wait.h> | |
14897d65 | 22 | #include <errno.h> |
2bed205e | 23 | #include <signal.h> |
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24 | |
25 | int save_parent; | |
26 | ||
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27 | /* Variable set by GDB. If true, then a fork child (or parent) exits |
28 | if its parent (or child) exits. Otherwise the process waits | |
29 | forever until either GDB or the alarm kills it. */ | |
30 | volatile int exit_if_relative_exits = 0; | |
31 | ||
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32 | /* The fork child. Just runs forever. */ |
33 | ||
34 | static int | |
35 | fork_child (void) | |
36 | { | |
a08ac84b TV |
37 | /* Don't run forever. */ |
38 | alarm (180); | |
39 | ||
a2077e25 | 40 | while (1) |
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41 | { |
42 | if (exit_if_relative_exits) | |
43 | { | |
44 | sleep (1); | |
45 | ||
46 | /* Exit if GDB kills the parent. */ | |
47 | if (getppid () != save_parent) | |
48 | break; | |
49 | if (kill (getppid (), 0) != 0) | |
50 | break; | |
51 | } | |
52 | else | |
53 | pause (); | |
54 | } | |
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55 | |
56 | return 0; | |
57 | } | |
58 | ||
f50d8a2e | 59 | /* The fork parent. Just runs forever. */ |
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60 | |
61 | static int | |
62 | fork_parent (void) | |
63 | { | |
a08ac84b TV |
64 | /* Don't run forever. */ |
65 | alarm (180); | |
66 | ||
f50d8a2e | 67 | while (1) |
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68 | { |
69 | if (exit_if_relative_exits) | |
70 | { | |
71 | int res = wait (NULL); | |
72 | if (res == -1 && errno == EINTR) | |
73 | continue; | |
74 | else if (res == -1) | |
75 | { | |
76 | perror ("wait"); | |
77 | return 1; | |
78 | } | |
79 | else | |
80 | return 0; | |
81 | } | |
82 | else | |
83 | pause (); | |
84 | } | |
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85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | int | |
90 | main (void) | |
91 | { | |
92 | pid_t pid; | |
93 | ||
94 | save_parent = getpid (); | |
95 | ||
a2077e25 PA |
96 | /* The parent and child should basically run forever without |
97 | tripping on any debug event. We want to check that GDB updates | |
98 | the parent and child running states correctly right after the | |
99 | fork. */ | |
100 | pid = fork (); | |
101 | if (pid > 0) | |
102 | return fork_parent (); | |
103 | else if (pid == 0) | |
104 | return fork_child (); | |
105 | else | |
106 | { | |
107 | perror ("fork"); | |
108 | return 1; | |
109 | } | |
110 | } |