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130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/* Verify the interaction of kill and thread groups.
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Copyright (C) 2019-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This test demonstrates that a signal which is sent to a specified
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thread ID using the kill function is delivered to the entire thread
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group (as if it had been sent to the process group). */
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#include <errno.h>
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#include <signal.h>
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#include <support/check.h>
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#include <support/xsignal.h>
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#include <support/xthread.h>
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#include <support/xunistd.h>
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/* Signal set containing SIGUSR1. */
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static sigset_t sigusr1_set;
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/* Used to synchronize the threads. */
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static pthread_barrier_t barrier;
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/* TID of the thread to which the signal is sent. */
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static pid_t target_tid;
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/* Thread which is expected to receive the SIGUSR1 signal. */
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static pthread_t signal_thread;
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/* Pipe used to block and terminate the signal thread. */
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static int pipe_signal[2];
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static volatile sig_atomic_t handler_tid;
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static void
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sigusr1_handler (int signo)
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{
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TEST_COMPARE (signo, SIGUSR1);
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TEST_VERIFY (pthread_self () == signal_thread);
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TEST_COMPARE (handler_tid, 0);
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handler_tid = gettid ();
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TEST_VERIFY (handler_tid > 0);
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/* Ensure that the read system call in thread_read exits if the
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signal is delivered before the system call is invoked. */
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char ch = 'X';
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xwrite (pipe_signal[1], &ch, 1);
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}
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/* Thread which calls pause without expecting it to return. The TID
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of this thread is used as the target in the kill function call. */
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static void *
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thread_pause_noreturn (void *closure)
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{
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target_tid = gettid ();
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TEST_VERIFY (target_tid > 0);
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xpthread_barrier_wait (&barrier);
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pause ();
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FAIL_EXIT1 ("The pause function returned");
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return NULL;
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}
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/* Thread which is expected to receive the signal. */
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static void *
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thread_read_signal (void *closure)
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{
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xpthread_sigmask (SIG_UNBLOCK, &sigusr1_set, NULL);
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xpthread_barrier_wait (&barrier);
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TEST_VERIFY (target_tid > 0);
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TEST_VERIFY (gettid () != target_tid);
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char ch;
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ssize_t ret = read (pipe_signal[0], &ch, 1);
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if (ret == 1)
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/* The signal was delivered before we entered the read system
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call. */
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TEST_COMPARE (ch, 'X');
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else
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{
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/* The signal was delivered while blocked in the read system
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call. */
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TEST_COMPARE (ret, -1);
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TEST_COMPARE (errno, EINTR);
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}
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TEST_COMPARE (handler_tid, gettid ());
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return NULL;
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}
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static int
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do_test (void)
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{
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/* Block the SIGUSR1 signal in all threads. */
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sigemptyset (&sigusr1_set);
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sigaddset (&sigusr1_set, SIGUSR1);
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xpthread_sigmask (SIG_BLOCK, &sigusr1_set, NULL);
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xsignal (SIGUSR1, sigusr1_handler);
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xpipe (pipe_signal);
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xpthread_barrier_init (&barrier, NULL, 3);
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pthread_t target_thread
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= xpthread_create (NULL, thread_pause_noreturn, NULL);
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signal_thread = xpthread_create (NULL, thread_read_signal, NULL);
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xpthread_barrier_wait (&barrier);
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/* Send the SIGUSR1 signal to the thread which has it blocked, and
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expect it to be delivered to the other thread. */
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TEST_COMPARE (kill (target_tid, SIGUSR1), 0);
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xpthread_join (signal_thread);
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xpthread_cancel (target_thread);
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xpthread_join (target_thread);
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xpthread_barrier_destroy (&barrier);
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return 0;
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}
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#include <support/test-driver.c>
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