/* 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;

}