]>
Commit | Line | Data |
---|---|---|
1d0fc213 | 1 | /* Verify the interaction of kill and thread groups. |
2b778ceb | 2 | Copyright (C) 2019-2021 Free Software Foundation, Inc. |
1d0fc213 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library 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 GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1d0fc213 FW |
18 | |
19 | /* This test demonstrates that a signal which is sent to a specified | |
20 | thread ID using the kill function is delivered to the entire thread | |
21 | group (as if it had been sent to the process group). */ | |
22 | ||
23 | #include <errno.h> | |
24 | #include <signal.h> | |
25 | #include <support/check.h> | |
26 | #include <support/xsignal.h> | |
27 | #include <support/xthread.h> | |
28 | #include <support/xunistd.h> | |
29 | ||
30 | /* Signal set containing SIGUSR1. */ | |
31 | static sigset_t sigusr1_set; | |
32 | ||
33 | /* Used to synchronize the threads. */ | |
34 | static pthread_barrier_t barrier; | |
35 | ||
36 | /* TID of the thread to which the signal is sent. */ | |
37 | static pid_t target_tid; | |
38 | ||
39 | /* Thread which is expected to receive the SIGUSR1 signal. */ | |
40 | static pthread_t signal_thread; | |
41 | ||
42 | /* Pipe used to block and terminate the signal thread. */ | |
43 | static int pipe_signal[2]; | |
44 | ||
45 | static volatile sig_atomic_t handler_tid; | |
46 | ||
47 | static void | |
48 | sigusr1_handler (int signo) | |
49 | { | |
50 | TEST_COMPARE (signo, SIGUSR1); | |
51 | TEST_VERIFY (pthread_self () == signal_thread); | |
52 | TEST_COMPARE (handler_tid, 0); | |
53 | handler_tid = gettid (); | |
54 | TEST_VERIFY (handler_tid > 0); | |
55 | /* Ensure that the read system call in thread_read exits if the | |
56 | signal is delivered before the system call is invoked. */ | |
57 | char ch = 'X'; | |
58 | xwrite (pipe_signal[1], &ch, 1); | |
59 | } | |
60 | ||
61 | /* Thread which calls pause without expecting it to return. The TID | |
62 | of this thread is used as the target in the kill function call. */ | |
63 | static void * | |
64 | thread_pause_noreturn (void *closure) | |
65 | { | |
66 | target_tid = gettid (); | |
67 | TEST_VERIFY (target_tid > 0); | |
68 | xpthread_barrier_wait (&barrier); | |
69 | pause (); | |
70 | FAIL_EXIT1 ("The pause function returned"); | |
71 | return NULL; | |
72 | } | |
73 | ||
74 | /* Thread which is expected to receive the signal. */ | |
75 | static void * | |
76 | thread_read_signal (void *closure) | |
77 | { | |
78 | xpthread_sigmask (SIG_UNBLOCK, &sigusr1_set, NULL); | |
79 | xpthread_barrier_wait (&barrier); | |
80 | TEST_VERIFY (target_tid > 0); | |
81 | TEST_VERIFY (gettid () != target_tid); | |
82 | char ch; | |
83 | ssize_t ret = read (pipe_signal[0], &ch, 1); | |
84 | if (ret == 1) | |
85 | /* The signal was delivered before we entered the read system | |
86 | call. */ | |
87 | TEST_COMPARE (ch, 'X'); | |
88 | else | |
89 | { | |
90 | /* The signal was delivered while blocked in the read system | |
91 | call. */ | |
92 | TEST_COMPARE (ret, -1); | |
93 | TEST_COMPARE (errno, EINTR); | |
94 | } | |
95 | TEST_COMPARE (handler_tid, gettid ()); | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | static int | |
100 | do_test (void) | |
101 | { | |
102 | /* Block the SIGUSR1 signal in all threads. */ | |
103 | sigemptyset (&sigusr1_set); | |
104 | sigaddset (&sigusr1_set, SIGUSR1); | |
105 | xpthread_sigmask (SIG_BLOCK, &sigusr1_set, NULL); | |
106 | ||
107 | xsignal (SIGUSR1, sigusr1_handler); | |
108 | xpipe (pipe_signal); | |
109 | ||
110 | xpthread_barrier_init (&barrier, NULL, 3); | |
111 | ||
112 | pthread_t target_thread | |
113 | = xpthread_create (NULL, thread_pause_noreturn, NULL); | |
114 | signal_thread = xpthread_create (NULL, thread_read_signal, NULL); | |
115 | xpthread_barrier_wait (&barrier); | |
116 | ||
117 | /* Send the SIGUSR1 signal to the thread which has it blocked, and | |
118 | expect it to be delivered to the other thread. */ | |
119 | TEST_COMPARE (kill (target_tid, SIGUSR1), 0); | |
120 | ||
121 | xpthread_join (signal_thread); | |
122 | xpthread_cancel (target_thread); | |
123 | xpthread_join (target_thread); | |
124 | ||
125 | xpthread_barrier_destroy (&barrier); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | #include <support/test-driver.c> |