/* Test of macros shared between <sys/wait.h> and <stdlib.h>.

   Copyright (C) 2010-2020 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>, 2010.  */

static int

test_sys_wait_macros (void)

{

  /* Check subset of <sys/wait.h> macros that must be visible here.

     Note that some of these macros are only portable when operating

     on an lvalue.  */

  int i;

  for (i = 0; i < 0x8000; i = (i ? i << 1 : 1))

    {

      /* POSIX requires that for all valid process statuses, that

         exactly one of these three macros is true.  But not all

         possible 16-bit values map to valid process status.

         Traditionally, 8 of the bits are for WIFEXITED, 7 of the bits

         to tell between WIFSIGNALED and WIFSTOPPED, and either 0x80

         or 0x8000 to flag that core was also dumped.  Since we don't

         know which byte is WIFEXITED, we skip the both possible bits

         that can signal core dump.  */

      if (i == 0x80)

        continue;

      if (!!WIFSIGNALED (i) + !!WIFEXITED (i) + !!WIFSTOPPED (i) != 1)

        return 1;

    }

  i = WEXITSTATUS (i) + WSTOPSIG (i) + WTERMSIG (i);

  switch (i)

    {

#if 0

  /* Gnulib doesn't guarantee these, yet.  */

    case WNOHANG:

    case WUNTRACED:

#endif

      break;

    }

  return 0;

}