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