glibc/stdlib/tst-setcontext4.c

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/* Testcase checks, if setcontext(), swapcontext() restores signal-mask
and if pending signals are delivered after those calls.
Copyright (C) 2018-2021 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
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/>. */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
#include <ucontext.h>
#include <unistd.h>
volatile int global;
volatile sig_atomic_t handlerCalled;
static void
check (const char *funcName)
{
sigset_t set;
/* check if SIGUSR2 is unblocked after setcontext-call. */
sigprocmask (SIG_BLOCK, NULL, &set);
if (sigismember (&set, SIGUSR2) != 0)
{
printf ("FAIL: SIGUSR2 is blocked after %s.\n", funcName);
exit (1);
}
if (sigismember (&set, SIGUSR1) != 1)
{
printf ("FAIL: SIGUSR1 is not blocked after %s.\n", funcName);
exit (1);
}
}
static void
signalmask (int how, int signum)
{
sigset_t set;
sigemptyset (&set);
sigaddset (&set, signum);
if (sigprocmask (how, &set, NULL) != 0)
{
printf ("FAIL: sigprocmaks (%d, %d, NULL): %m\n", how, signum);
exit (1);
}
}
static void
signalpending (int signum, const char *msg)
{
sigset_t set;
sigemptyset (&set);
if (sigpending (&set) != 0)
{
printf ("FAIL: sigpending: %m\n");
exit (1);
}
if (sigismember (&set, SIGUSR2) != 1)
{
printf ("FAIL: Signal %d is not pending %s\n", signum, msg);
exit (1);
}
}
static void
handler (int __attribute__ ((unused)) signum)
{
handlerCalled ++;
}
static int
do_test (void)
{
ucontext_t ctx, oldctx;
struct sigaction action;
pid_t pid;
pid = getpid ();
/* unblock SIGUSR2 */
signalmask (SIG_UNBLOCK, SIGUSR2);
/* block SIGUSR1 */
signalmask (SIG_BLOCK, SIGUSR1);
/* register handler for SIGUSR2 */
action.sa_flags = 0;
action.sa_handler = handler;
sigemptyset (&action.sa_mask);
sigaction (SIGUSR2, &action, NULL);
if (getcontext (&ctx) != 0)
{
printf ("FAIL: getcontext: %m\n");
exit (1);
}
global++;
if (global == 1)
{
puts ("after getcontext");
/* block SIGUSR2 */
signalmask (SIG_BLOCK, SIGUSR2);
/* send SIGUSR2 to me */
handlerCalled = 0;
kill (pid, SIGUSR2);
/* was SIGUSR2 handler called? */
if (handlerCalled != 0)
{
puts ("FAIL: signal handler was called, but signal was blocked.");
exit (1);
}
/* is SIGUSR2 pending? */
signalpending (SIGUSR2, "before setcontext");
/* SIGUSR2 will be unblocked by setcontext-call. */
if (setcontext (&ctx) != 0)
{
printf ("FAIL: setcontext: %m\n");
exit (1);
}
}
else if (global == 2)
{
puts ("after setcontext");
/* check SIGUSR1/2 */
check ("setcontext");
/* was SIGUSR2 handler called? */
if (handlerCalled != 1)
{
puts ("FAIL: signal handler was not called after setcontext.");
exit (1);
}
/* block SIGUSR2 */
signalmask (SIG_BLOCK, SIGUSR2);
/* send SIGUSR2 to me */
handlerCalled = 0;
kill (pid, SIGUSR2);
/* was SIGUSR2 handler called? */
if (handlerCalled != 0)
{
puts ("FAIL: signal handler was called, but signal was blocked.");
exit (1);
}
/* is SIGUSR2 pending? */
signalpending (SIGUSR2, "before swapcontext");
if (swapcontext (&oldctx, &ctx) != 0)
{
printf ("FAIL: swapcontext: %m\n");
exit (1);
}
puts ("FAIL: returned from (&oldctx, &ctx)");
exit (1);
}
else if ( global != 3 )
{
puts ("FAIL: 'global' not incremented three times");
exit (1);
}
puts ("after swapcontext");
/* check SIGUSR1/2 */
check ("swapcontext");
/* was SIGUSR2 handler called? */
if (handlerCalled != 1)
{
puts ("FAIL: signal handler was not called after swapcontext.");
exit (1);
}
/* check sigmask in old context of swapcontext-call */
if (sigismember (&oldctx.uc_sigmask, SIGUSR2) != 1)
{
puts ("FAIL: SIGUSR2 is not blocked in oldctx.uc_sigmask.");
exit (1);
}
if (sigismember (&oldctx.uc_sigmask, SIGUSR1) != 1)
{
puts ("FAIL: SIGUSR1 is not blocked in oldctx.uc_sigmaks.");
exit (1);
}
return 0;
}
#include <support/test-driver.c>