Mercurial > gnulib
view tests/test-sigaction.c @ 40163:b89f4c441767
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author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Mon, 28 Jan 2019 01:20:11 +0100 |
parents | b06060465f09 |
children |
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/* Test of sigaction() function. Copyright (C) 2008-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by Eric Blake <ebb9@byu.net>, 2008. */ #include <config.h> #include <signal.h> #include "signature.h" SIGNATURE_CHECK (sigaction, int, (int, struct sigaction const *, struct sigaction *)); #include <stddef.h> #include "macros.h" #ifndef SA_NOCLDSTOP # define SA_NOCLDSTOP 0 #endif #ifndef SA_ONSTACK # define SA_ONSTACK 0 #endif #ifndef SA_RESETHAND # define SA_RESETHAND 0 #endif #ifndef SA_RESTART # define SA_RESTART 0 #endif #ifndef SA_SIGINFO # define SA_SIGINFO 0 #endif #ifndef SA_NOCLDWAIT # define SA_NOCLDWAIT 0 #endif /* Define a mask of flags required by POSIX. Some implementations provide other flags as extensions, such as SA_RESTORER, that we must ignore in this test. */ #define MASK_SA_FLAGS (SA_NOCLDSTOP | SA_ONSTACK | SA_RESETHAND | SA_RESTART \ | SA_SIGINFO | SA_NOCLDWAIT | SA_NODEFER) /* This test is unsafe in the presence of an asynchronous SIGABRT, because we install a signal-handler that is intentionally not async-safe. Hopefully, this does not lead to too many reports of false failures, since people don't generally use 'kill -s SIGABRT' to end a runaway program. */ static void handler (int sig) { static int entry_count; struct sigaction sa; ASSERT (sig == SIGABRT); ASSERT (sigaction (SIGABRT, NULL, &sa) == 0); ASSERT ((sa.sa_flags & SA_SIGINFO) == 0); switch (entry_count++) { case 0: ASSERT ((sa.sa_flags & SA_RESETHAND) == 0); ASSERT (sa.sa_handler == handler); break; case 1: /* This assertion fails on glibc-2.3.6 systems with LinuxThreads, when this program is linked with -lpthread, due to the sigaction() override in libpthread.so. */ #if !(defined __GLIBC__ || defined __UCLIBC__) ASSERT (sa.sa_handler == SIG_DFL); #endif break; default: ASSERT (0); } } int main (void) { struct sigaction sa; struct sigaction old_sa; sa.sa_handler = handler; sa.sa_flags = 0; ASSERT (sigemptyset (&sa.sa_mask) == 0); ASSERT (sigaction (SIGABRT, &sa, NULL) == 0); ASSERT (raise (SIGABRT) == 0); sa.sa_flags = SA_RESETHAND | SA_NODEFER; ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0); ASSERT ((old_sa.sa_flags & MASK_SA_FLAGS) == 0); ASSERT (old_sa.sa_handler == handler); ASSERT (raise (SIGABRT) == 0); sa.sa_handler = SIG_DFL; ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0); ASSERT ((old_sa.sa_flags & SA_SIGINFO) == 0); #if !(defined __GLIBC__ || defined __UCLIBC__) /* see above */ ASSERT (old_sa.sa_handler == SIG_DFL); #endif sa.sa_handler = SIG_IGN; ASSERT (sigaction (SIGABRT, &sa, NULL) == 0); ASSERT (raise (SIGABRT) == 0); ASSERT (sigaction (SIGABRT, NULL, &old_sa) == 0); ASSERT (old_sa.sa_handler == SIG_IGN); ASSERT (raise (SIGABRT) == 0); return 0; }