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+/* Test of sigaction() function.
+ Copyright (C) 2008-2022 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;
+}