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4403d8e9 JK |
1 | /* Test case for forgotten hw-watchpoints after fork()-off of a process. |
2 | ||
32d0add0 | 3 | Copyright 2012-2015 Free Software Foundation, Inc. |
4403d8e9 JK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
7785b880 | 9 | the Free Software Foundation; either version 3 of the License, or |
4403d8e9 JK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
7785b880 | 18 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
4403d8e9 JK |
19 | |
20 | #include <string.h> | |
21 | #include <errno.h> | |
22 | #include <unistd.h> | |
23 | #include <assert.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | ||
27 | #include "watchpoint-fork.h" | |
28 | ||
29 | /* `pid_t' may not be available. */ | |
30 | ||
31 | static volatile int usr1_got; | |
32 | ||
33 | static void | |
34 | handler_usr1 (int signo) | |
35 | { | |
36 | usr1_got++; | |
37 | } | |
38 | ||
39 | void | |
40 | forkoff (int nr) | |
41 | { | |
42 | int child, save_parent = getpid (); | |
43 | int i; | |
44 | struct sigaction act, oldact; | |
45 | #ifdef THREAD | |
46 | void *thread_result; | |
47 | #endif | |
48 | ||
49 | memset (&act, 0, sizeof act); | |
50 | act.sa_flags = SA_RESTART; | |
51 | act.sa_handler = handler_usr1; | |
52 | sigemptyset (&act.sa_mask); | |
53 | i = sigaction (SIGUSR1, &act, &oldact); | |
54 | assert (i == 0); | |
55 | ||
56 | child = fork (); | |
57 | switch (child) | |
58 | { | |
59 | case -1: | |
60 | assert (0); | |
61 | default: | |
62 | printf ("parent%d: %d\n", nr, (int) child); | |
63 | ||
64 | /* Sleep for a while to possibly get incorrectly ATTACH_THREADed by GDB | |
65 | tracing the child fork with no longer valid thread/lwp entries of the | |
66 | parent. */ | |
67 | ||
68 | i = sleep (2); | |
69 | assert (i == 0); | |
70 | ||
71 | /* We must not get caught here (against a forgotten breakpoint). */ | |
72 | ||
73 | var++; | |
74 | marker (); | |
75 | ||
76 | #ifdef THREAD | |
77 | /* And neither got caught our thread. */ | |
78 | ||
79 | step = 99; | |
80 | i = pthread_join (thread, &thread_result); | |
81 | assert (i == 0); | |
82 | assert (thread_result == (void *) 99UL); | |
83 | #endif | |
84 | ||
85 | /* Be sure our child knows we did not get caught above. */ | |
86 | ||
87 | i = kill (child, SIGUSR1); | |
88 | assert (i == 0); | |
89 | ||
90 | /* Sleep for a while to check GDB's `info threads' no longer tracks us in | |
91 | the child fork. */ | |
92 | ||
93 | i = sleep (2); | |
94 | assert (i == 0); | |
95 | ||
96 | _exit (0); | |
97 | case 0: | |
98 | printf ("child%d: %d\n", nr, (int) getpid ()); | |
99 | ||
100 | /* Let the parent signal us about its success. Be careful of races. */ | |
101 | ||
102 | for (;;) | |
103 | { | |
104 | /* Parent either died (and USR1_GOT is zero) or it succeeded. */ | |
105 | if (getppid () != save_parent) | |
106 | break; | |
107 | if (kill (getppid (), 0) != 0) | |
108 | break; | |
109 | /* Parent succeeded? */ | |
110 | if (usr1_got) | |
111 | break; | |
112 | ||
113 | #ifdef THREAD | |
114 | i = pthread_yield (); | |
115 | assert (i == 0); | |
116 | #endif | |
117 | } | |
118 | assert (usr1_got); | |
119 | ||
120 | /* We must get caught here (against a false watchpoint removal). */ | |
121 | ||
122 | marker (); | |
123 | } | |
124 | ||
125 | i = sigaction (SIGUSR1, &oldact, NULL); | |
126 | assert (i == 0); | |
127 | } |