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133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
/* Smoke test for the tgkill system call.
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Copyright (C) 2019-2025 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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#include <errno.h>
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#include <signal.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/xthread.h>
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#include <unistd.h>
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/* Number of times sigusr1_handler has been invoked. */
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static volatile sig_atomic_t signals_delivered;
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/* Expected TID of the thread receiving the signal. */
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static pid_t expected_signal_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 (expected_signal_tid, gettid ());
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++signals_delivered;
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}
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struct pid_and_tid
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{
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pid_t pid;
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pid_t tid;
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};
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/* Send signals from the subprocess which are not expected to be
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delivered. There is no handler for SIGUSR2, so delivery will
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result in a test failure. CLOSURE must point to a valid PID/TID
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combination that is still running. */
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static void
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subprocess_no_tid_match (void *closure)
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{
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struct pid_and_tid *ids = closure;
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TEST_COMPARE (tgkill (ids->pid, gettid (), SIGUSR2), -1);
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TEST_COMPARE (errno, ESRCH);
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TEST_COMPARE (tgkill (getpid (), ids->tid, SIGUSR2), -1);
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TEST_COMPARE (errno, ESRCH);
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TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR2), -1);
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TEST_COMPARE (errno, ESRCH);
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}
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/* Called from threadfunc below. */
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static void
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subprocess (void *closure)
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{
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int original_tid = expected_signal_tid;
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/* Do not expect that the following signals are delivered to the
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subprocess. The parent process retains the original
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expected_signal_tid value. */
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expected_signal_tid = 0;
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TEST_COMPARE (tgkill (getpid (), original_tid, SIGUSR1), -1);
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TEST_COMPARE (errno, ESRCH);
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TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR1), -1);
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TEST_COMPARE (errno, ESRCH);
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TEST_COMPARE (expected_signal_tid, 0);
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/* This call has the correct PID/TID combination and is therefore
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expected to succeed. */
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TEST_COMPARE (tgkill (getppid (), original_tid, SIGUSR1), 0);
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}
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static void *
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threadfunc (void *closure)
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{
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TEST_VERIFY (gettid () != getpid ());
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expected_signal_tid = gettid ();
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TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
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TEST_COMPARE (signals_delivered, 1);
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signals_delivered = 0;
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support_isolate_in_subprocess (subprocess, NULL);
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/* Check that exactly one signal arrived from the subprocess. */
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TEST_COMPARE (signals_delivered, 1);
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support_isolate_in_subprocess (subprocess_no_tid_match,
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&(struct pid_and_tid)
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{
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.pid = getpid (),
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.tid = gettid (),
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});
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support_isolate_in_subprocess (subprocess_no_tid_match,
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&(struct pid_and_tid)
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{
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.pid = getpid (),
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.tid = getpid (),
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});
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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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TEST_VERIFY_EXIT (signal (SIGUSR1, sigusr1_handler) != SIG_ERR);
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expected_signal_tid = gettid ();
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TEST_COMPARE (gettid (), getpid ());
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TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
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TEST_COMPARE (signals_delivered, 1);
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signals_delivered = 0;
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xpthread_join (xpthread_create (NULL, threadfunc, NULL));
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TEST_VERIFY (signal (SIGUSR1, SIG_DFL) == sigusr1_handler);
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return 0;
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}
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#include <support/test-driver.c>
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