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/* Testcase checks, if setcontext(), swapcontext() restores signal-mask
and if pending signals are delivered after those calls.
Copyright (C) 2015-2020 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
<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 ("after returned from swapcontext");
if (global != 3)
{
puts ("FAIL: returned from swapcontext without ctx-context called.");
exit (1);
}
puts ("test succeeded");
return 0;
}
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);
}
/* change to old context, which was gathered by swapcontext() call. */
setcontext (&oldctx);
puts ("FAIL: returned from setcontext (&oldctx)");
exit (1);
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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