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c6f7f9c8 TT |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
1d506c26 | 3 | Copyright 2023-2024 Free Software Foundation, Inc. |
c6f7f9c8 TT |
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 | ||
20 | #include <assert.h> | |
21 | #include <stdio.h> | |
22 | #include <unistd.h> | |
23 | #include <sys/ptrace.h> | |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <errno.h> | |
27 | ||
28 | int fds[2]; | |
29 | ||
30 | _Atomic pid_t bg_tid = 0; | |
31 | ||
32 | pthread_barrier_t barrier; | |
33 | ||
34 | #define FIVE_MINUTES (5 * 60) | |
35 | ||
36 | /* One thread of the child process. This is traced by the parent | |
37 | process. */ | |
38 | void * | |
39 | block (void *ignore) | |
40 | { | |
41 | bg_tid = gettid (); | |
42 | pthread_barrier_wait (&barrier); | |
43 | sleep (FIVE_MINUTES); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* The parent process blocks in this function. */ | |
48 | void | |
49 | parent_stop (pid_t child_thread_pid) | |
50 | { | |
51 | sleep (FIVE_MINUTES); | |
52 | } | |
53 | ||
54 | int | |
55 | main () | |
56 | { | |
57 | int result; | |
58 | ||
59 | pthread_barrier_init (&barrier, NULL, 2); | |
60 | ||
61 | result = pipe (fds); | |
62 | assert (result != -1); | |
63 | ||
64 | pid_t child = fork (); | |
65 | if (child != 0) | |
66 | { | |
67 | /* Parent. */ | |
68 | close (fds[1]); | |
69 | ||
70 | pid_t the_tid; | |
71 | result = read (fds[0], &the_tid, sizeof (the_tid)); | |
72 | assert (result == sizeof (the_tid)); | |
73 | ||
74 | /* Trace a single, non-main thread of the child. This should | |
75 | prevent gdb from attaching to the child at all. The bug here | |
76 | was that gdb would get into an infinite loop repeatedly | |
77 | trying to attach to this thread. */ | |
78 | result = ptrace (PTRACE_SEIZE, the_tid, (void *) 0, (void *) 0); | |
79 | if (result == -1) | |
80 | perror ("ptrace"); | |
81 | ||
82 | parent_stop (child); | |
83 | } | |
84 | else | |
85 | { | |
86 | /* Child. */ | |
87 | ||
88 | close (fds[0]); | |
89 | ||
90 | pthread_t thr; | |
91 | result = pthread_create (&thr, 0, block, 0); | |
92 | assert (result == 0); | |
93 | ||
94 | /* Wait until the TID has been assigned. */ | |
95 | pthread_barrier_wait (&barrier); | |
96 | assert (bg_tid != 0); | |
97 | ||
98 | result = write (fds[1], &bg_tid, sizeof (bg_tid)); | |
99 | assert (result == sizeof (bg_tid)); | |
100 | ||
101 | sleep (FIVE_MINUTES); | |
102 | } | |
103 | ||
104 | exit (0); | |
105 | } |