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a2077e25 PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
b811d2c2 | 3 | Copyright 2015-2020 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> |
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23 | |
24 | int save_parent; | |
25 | ||
14897d65 PA |
26 | /* Variable set by GDB. If true, then a fork child (or parent) exits |
27 | if its parent (or child) exits. Otherwise the process waits | |
28 | forever until either GDB or the alarm kills it. */ | |
29 | volatile int exit_if_relative_exits = 0; | |
30 | ||
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31 | /* The fork child. Just runs forever. */ |
32 | ||
33 | static int | |
34 | fork_child (void) | |
35 | { | |
a08ac84b TV |
36 | /* Don't run forever. */ |
37 | alarm (180); | |
38 | ||
a2077e25 | 39 | while (1) |
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40 | { |
41 | if (exit_if_relative_exits) | |
42 | { | |
43 | sleep (1); | |
44 | ||
45 | /* Exit if GDB kills the parent. */ | |
46 | if (getppid () != save_parent) | |
47 | break; | |
48 | if (kill (getppid (), 0) != 0) | |
49 | break; | |
50 | } | |
51 | else | |
52 | pause (); | |
53 | } | |
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54 | |
55 | return 0; | |
56 | } | |
57 | ||
f50d8a2e | 58 | /* The fork parent. Just runs forever. */ |
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59 | |
60 | static int | |
61 | fork_parent (void) | |
62 | { | |
a08ac84b TV |
63 | /* Don't run forever. */ |
64 | alarm (180); | |
65 | ||
f50d8a2e | 66 | while (1) |
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67 | { |
68 | if (exit_if_relative_exits) | |
69 | { | |
70 | int res = wait (NULL); | |
71 | if (res == -1 && errno == EINTR) | |
72 | continue; | |
73 | else if (res == -1) | |
74 | { | |
75 | perror ("wait"); | |
76 | return 1; | |
77 | } | |
78 | else | |
79 | return 0; | |
80 | } | |
81 | else | |
82 | pause (); | |
83 | } | |
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84 | |
85 | return 0; | |
86 | } | |
87 | ||
88 | int | |
89 | main (void) | |
90 | { | |
91 | pid_t pid; | |
92 | ||
93 | save_parent = getpid (); | |
94 | ||
a2077e25 PA |
95 | /* The parent and child should basically run forever without |
96 | tripping on any debug event. We want to check that GDB updates | |
97 | the parent and child running states correctly right after the | |
98 | fork. */ | |
99 | pid = fork (); | |
100 | if (pid > 0) | |
101 | return fork_parent (); | |
102 | else if (pid == 0) | |
103 | return fork_child (); | |
104 | else | |
105 | { | |
106 | perror ("fork"); | |
107 | return 1; | |
108 | } | |
109 | } |