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1/* Verify the interaction of kill and thread groups.
2 Copyright (C) 2019 Free Software Foundation, Inc.
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
17 <http://www.gnu.org/licenses/>. */
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. */
31static sigset_t sigusr1_set;
32
33/* Used to synchronize the threads. */
34static pthread_barrier_t barrier;
35
36/* TID of the thread to which the signal is sent. */
37static pid_t target_tid;
38
39/* Thread which is expected to receive the SIGUSR1 signal. */
40static pthread_t signal_thread;
41
42/* Pipe used to block and terminate the signal thread. */
43static int pipe_signal[2];
44
45static volatile sig_atomic_t handler_tid;
46
47static void
48sigusr1_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. */
63static void *
64thread_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. */
75static void *
76thread_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
99static int
100do_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>
130

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