1  /* Test of macros shared between <sys/wait.h> and <stdlib.h>.
       2     Copyright (C) 2010-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Eric Blake <ebb9@byu.net>, 2010.  */
      18  
      19  static int
      20  test_sys_wait_macros (void)
      21  {
      22    /* Check subset of <sys/wait.h> macros that must be visible here.
      23       Note that some of these macros are only portable when operating
      24       on an lvalue.  */
      25    int i;
      26    for (i = 0; i < 0x8000; i = (i ? i << 1 : 1))
      27      {
      28        /* POSIX requires that for all valid process statuses, that
      29           exactly one of these three macros is true.  But not all
      30           possible 16-bit values map to valid process status.
      31           Traditionally, 8 of the bits are for WIFEXITED, 7 of the bits
      32           to tell between WIFSIGNALED and WIFSTOPPED, and either 0x80
      33           or 0x8000 to flag that core was also dumped.  Since we don't
      34           know which byte is WIFEXITED, we skip the both possible bits
      35           that can signal core dump.  */
      36        if (i == 0x80)
      37          continue;
      38        if (!!WIFSIGNALED (i) + !!WIFEXITED (i) + !!WIFSTOPPED (i) != 1)
      39          return 1;
      40      }
      41    i = WEXITSTATUS (i) + WSTOPSIG (i) + WTERMSIG (i);
      42  
      43  #if 0
      44    switch (i)
      45      {
      46    /* Gnulib doesn't guarantee these, yet.  */
      47      case WNOHANG:
      48      case WUNTRACED:
      49        break;
      50      }
      51  #endif
      52    return 0;
      53  }