glibc/nptl/tst-robust-fork.c

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/* Test the interaction of fork and robust mutexes.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
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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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://www.gnu.org/licenses/>. */
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#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <support/check.h>
#include <support/test-driver.h>
#include <support/xthread.h>
#include <support/xunistd.h>
#include <sys/mman.h>
/* Data shared between processes. */
struct shared
{
pthread_mutex_t parent_mutex;
pthread_mutex_t child_mutex;
};
/* These flags control which mutex settings are enabled in the parent
and child (separately). */
enum mutex_bits
{
mutex_pshared = 1,
mutex_robust = 2,
mutex_pi = 4,
mutex_check = 8,
/* All bits combined. */
mutex_all_bits = 15,
};
static void
mutex_init (pthread_mutex_t *mutex, int bits)
{
pthread_mutexattr_t attr;
xpthread_mutexattr_init (&attr);
if (bits & mutex_pshared)
xpthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED);
if (bits & mutex_robust)
xpthread_mutexattr_setrobust (&attr, PTHREAD_MUTEX_ROBUST);
if (bits & mutex_pi)
xpthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_INHERIT);
if (bits & mutex_check)
xpthread_mutexattr_settype (&attr, PTHREAD_MUTEX_ERRORCHECK);
xpthread_mutex_init (mutex, &attr);
xpthread_mutexattr_destroy (&attr);
}
static void
one_test (int parent_bits, int child_bits, int nonshared_bits,
bool lock_nonshared, bool lock_child)
{
struct shared *shared = xmmap (NULL, sizeof (*shared),
PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_SHARED, -1);
mutex_init (&shared->parent_mutex, parent_bits);
mutex_init (&shared->child_mutex, child_bits);
/* Acquire the parent mutex in the parent. */
xpthread_mutex_lock (&shared->parent_mutex);
pthread_mutex_t nonshared_mutex;
mutex_init (&nonshared_mutex, nonshared_bits);
if (lock_nonshared)
xpthread_mutex_lock (&nonshared_mutex);
pid_t pid = xfork ();
if (pid == 0)
{
/* Child process. */
if (lock_child)
xpthread_mutex_lock (&shared->child_mutex);
else
xmunmap (shared, sizeof (*shared));
if (lock_nonshared)
/* Reinitialize the non-shared mutex if it was locked in the
parent. */
mutex_init (&nonshared_mutex, nonshared_bits);
xpthread_mutex_lock (&nonshared_mutex);
/* For robust mutexes, the _exit call will perform the unlock
instead. */
if (lock_child && !(child_bits & mutex_robust))
xpthread_mutex_unlock (&shared->child_mutex);
_exit (0);
}
/* Parent process. */
{
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (status == 0);
}
if (parent_bits & mutex_check)
/* Test for expected self-deadlock. This is only possible to
detect if the mutex is error-checking. */
TEST_VERIFY_EXIT (pthread_mutex_lock (&shared->parent_mutex) == EDEADLK);
pid = xfork ();
if (pid == 0)
{
/* Child process. We can perform some checks only if we are
dealing with process-shared mutexes. */
if (parent_bits & mutex_pshared)
/* It must not be possible to acquire the parent mutex.
NB: This check touches a mutex which has been acquired in
the parent at fork time, so it might be deemed undefined
behavior, pending the resolution of Austin Groups issue
1112. */
TEST_VERIFY_EXIT (pthread_mutex_trylock (&shared->parent_mutex)
== EBUSY);
if (lock_child && (child_bits & mutex_robust))
{
if (!(child_bits & mutex_pshared))
/* No further tests possible. */
_exit (0);
TEST_VERIFY_EXIT (pthread_mutex_lock (&shared->child_mutex)
== EOWNERDEAD);
xpthread_mutex_consistent (&shared->child_mutex);
}
else
/* We did not acquire the lock in the first child process, or
we unlocked the mutex again because the mutex is not a
robust mutex. */
xpthread_mutex_lock (&shared->child_mutex);
xpthread_mutex_unlock (&shared->child_mutex);
_exit (0);
}
/* Parent process. */
{
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (status == 0);
}
if (lock_nonshared)
xpthread_mutex_unlock (&nonshared_mutex);
xpthread_mutex_unlock (&shared->parent_mutex);
xpthread_mutex_destroy (&shared->parent_mutex);
xpthread_mutex_destroy (&shared->child_mutex);
xpthread_mutex_destroy (&nonshared_mutex);
xmunmap (shared, sizeof (*shared));
}
static int
do_test (void)
{
for (int parent_bits = 0; parent_bits <= mutex_all_bits; ++parent_bits)
for (int child_bits = 0; child_bits <= mutex_all_bits; ++child_bits)
for (int nonshared_bits = 0; nonshared_bits <= mutex_all_bits;
++nonshared_bits)
for (int lock_nonshared = 0; lock_nonshared < 2; ++lock_nonshared)
for (int lock_child = 0; lock_child < 2; ++lock_child)
{
if (test_verbose)
printf ("info: parent_bits=0x%x child_bits=0x%x"
" nonshared_bits=0x%x%s%s\n",
parent_bits, child_bits, nonshared_bits,
lock_nonshared ? " lock_nonshared" : "",
lock_child ? " lock_child" : "");
one_test (parent_bits, child_bits, nonshared_bits,
lock_nonshared, lock_child);
}
return 0;
}
#define TIMEOUT 100
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#include <support/test-driver.c>