Commit | Line | Data |
---|---|---|
a71501e2 PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
3 | Copyright 2021 Free Software Foundation, Inc. | |
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 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | #include <pthread.h> | |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <signal.h> | |
26 | ||
27 | /* Number of threads we'll create. */ | |
28 | int n_threads = 10; | |
29 | ||
30 | int mypid; | |
31 | ||
32 | static void | |
33 | setup_done (void) | |
34 | { | |
35 | } | |
36 | ||
37 | /* Entry point for threads. Loops forever. */ | |
38 | ||
39 | void * | |
40 | thread_func (void *arg) | |
41 | { | |
42 | /* Avoid setting the breakpoint at an instruction that wouldn't | |
43 | require a fixup phase, like a branch/jump. In such a case, even | |
44 | if GDB manages to detach the inferior with an incomplete | |
45 | displaced step, GDB inferior may still not crash. A breakpoint | |
46 | at a line that increments a variable is good bet that we end up | |
47 | setting a breakpoint at an instruction that will require a fixup | |
48 | phase to move the PC from the scratch pad to the instruction | |
49 | after the breakpoint. */ | |
50 | volatile unsigned counter = 0; | |
51 | ||
52 | while (1) | |
53 | { | |
54 | counter++; /* Set breakpoint here. */ | |
55 | counter++; | |
56 | counter++; | |
57 | } | |
58 | ||
59 | return NULL; | |
60 | } | |
61 | ||
62 | /* Allow for as much timeout as DejaGnu wants, plus a bit of | |
63 | slack. */ | |
64 | #define SECONDS (TIMEOUT + 20) | |
65 | ||
66 | /* We'll exit after this many seconds. */ | |
67 | unsigned int seconds_left = SECONDS; | |
68 | ||
69 | /* GDB sets this whenever it's about to start a new detach/attach | |
70 | sequence. We react by resetting the seconds-left counter. */ | |
71 | volatile int again = 0; | |
72 | ||
73 | int | |
74 | main (int argc, char **argv) | |
75 | { | |
76 | int i; | |
77 | ||
78 | signal (SIGUSR1, SIG_IGN); | |
79 | ||
80 | mypid = getpid (); | |
81 | setup_done (); | |
82 | ||
83 | if (argc > 1) | |
84 | n_threads = atoi (argv[1]); | |
85 | ||
86 | /* Spawn the test threads. */ | |
87 | for (i = 0; i < n_threads; ++i) | |
88 | { | |
89 | pthread_t child; | |
90 | int rc; | |
91 | ||
92 | rc = pthread_create (&child, NULL, thread_func, NULL); | |
93 | assert (rc == 0); | |
94 | } | |
95 | ||
96 | /* Exit after a while if GDB is gone/crashes. But wait long enough | |
97 | for one attach/detach sequence done by the .exp file. */ | |
98 | while (--seconds_left > 0) | |
99 | { | |
100 | sleep (1); | |
101 | ||
102 | if (again) | |
103 | { | |
104 | /* GDB should be reattaching soon. Restart the timer. */ | |
105 | again = 0; | |
106 | seconds_left = SECONDS; | |
107 | } | |
108 | } | |
109 | ||
110 | printf ("timeout, exiting\n"); | |
111 | return 0; | |
112 | } |