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Linux: Add the tgkill function

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The tgkill function is sometimes used in crash handlers.

<bits/signal_ext.h> follows the same approach as <bits/unistd_ext.h>
(which was added for the gettid system call wrapper).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2019-05-14 21:35:09 +02:00
parent 6807f47b81
commit 04b261bdc1
38 changed files with 282 additions and 4 deletions
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132
sysdeps/unix/sysv/linux/tst-tgkill.c Normal file
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/* Smoke test for the tgkill system call.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/xthread.h>
#include <unistd.h>
/* Number of times sigusr1_handler has been invoked. */
static volatile sig_atomic_t signals_delivered;
/* Expected TID of the thread receiving the signal. */
static pid_t expected_signal_tid;
static void
sigusr1_handler (int signo)
{
TEST_COMPARE (expected_signal_tid, gettid ());
++signals_delivered;
}
struct pid_and_tid
{
pid_t pid;
pid_t tid;
};
/* Send signals from the subprocess which are not expected to be
delivered. There is no handler for SIGUSR2, so delivery will
result in a test failure. CLOSURE must point to a valid PID/TID
combination that is still running. */
static void
subprocess_no_tid_match (void *closure)
{
struct pid_and_tid *ids = closure;
TEST_COMPARE (tgkill (ids->pid, gettid (), SIGUSR2), -1);
TEST_COMPARE (errno, ESRCH);
TEST_COMPARE (tgkill (getpid (), ids->tid, SIGUSR2), -1);
TEST_COMPARE (errno, ESRCH);
TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR2), -1);
TEST_COMPARE (errno, ESRCH);
}
/* Called from threadfunc below. */
static void
subprocess (void *closure)
{
int original_tid = expected_signal_tid;
/* Do not expect that the folloing signals are delivered to the
subprocess. The parent process retains the original
expected_signal_tid value. */
expected_signal_tid = 0;
TEST_COMPARE (tgkill (getpid (), original_tid, SIGUSR1), -1);
TEST_COMPARE (errno, ESRCH);
TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR1), -1);
TEST_COMPARE (errno, ESRCH);
TEST_COMPARE (expected_signal_tid, 0);
/* This call has the correct PID/TID combination and is therefore
expected to suceed. */
TEST_COMPARE (tgkill (getppid (), original_tid, SIGUSR1), 0);
}
static void *
threadfunc (void *closure)
{
TEST_VERIFY (gettid () != getpid ());
expected_signal_tid = gettid ();
TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
TEST_COMPARE (signals_delivered, 1);
signals_delivered = 0;
support_isolate_in_subprocess (subprocess, NULL);
/* Check that exactly one signal arrived from the subprocess. */
TEST_COMPARE (signals_delivered, 1);
support_isolate_in_subprocess (subprocess_no_tid_match,
&(struct pid_and_tid)
{
.pid = getpid (),
.tid = gettid (),
});
support_isolate_in_subprocess (subprocess_no_tid_match,
&(struct pid_and_tid)
{
.pid = getpid (),
.tid = getpid (),
});
return NULL;
}
static int
do_test (void)
{
TEST_VERIFY_EXIT (signal (SIGUSR1, sigusr1_handler) != SIG_ERR);
expected_signal_tid = gettid ();
TEST_COMPARE (gettid (), getpid ());
TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
TEST_COMPARE (signals_delivered, 1);
signals_delivered = 0;
xpthread_join (xpthread_create (NULL, threadfunc, NULL));
TEST_VERIFY (signal (SIGUSR1, SIG_DFL) == sigusr1_handler);
return 0;
}
#include <support/test-driver.c>