sysdeps/generic/waitstatus.h

   1 /* Definitions of status bits for `wait' et al.
   2 Copyright (C) 1992, 1994 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 /* Everything extant so far uses these same bits.  */
  21
  22 #ifndef _WAITSTATUS_H
  23 #define _WAITSTATUS_H
  24
  25 /* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
  26 #define __WEXITSTATUS(status)   (((status) & 0xff00) >> 8)
  27
  28 /* If WIFSIGNALED(STATUS), the terminating signal.  */
  29 #define __WTERMSIG(status)      ((status) & 0x7f)
  30
  31 /* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
  32 #define __WSTOPSIG(status)      __WEXITSTATUS(status)
  33
  34 /* Nonzero if STATUS indicates normal termination.  */
  35 #define __WIFEXITED(status)     (__WTERMSIG(status) == 0)
  36
  37 /* Nonzero if STATUS indicates termination by a signal.  */
  38 #ifdef  __GNUC__
  39 #define __WIFSIGNALED(status)                                                 \
  40   (__extension__ ({ int __stat = (status);                                    \
  41                     !__WIFSTOPPED(__stat) && !__WIFEXITED(__stat); }))
  42 #else   /* Not GCC.  */
  43 #define __WIFSIGNALED(status)   (!__WIFSTOPPED(status) && !__WIFEXITED(status))
  44 #endif  /* GCC.  */
  45
  46 /* Nonzero if STATUS indicates the child is stopped.  */
  47 #define __WIFSTOPPED(status)    (((status) & 0xff) == 0x7f)
  48
  49 /* Nonzero if STATUS indicates the child dumped core.  */
  50 #define __WCOREDUMP(status)     ((status) & __WCOREFLAG)
  51
  52 /* Macros for constructing status values.  */
  53 #define __W_EXITCODE(ret, sig)  ((ret) << 8 | (sig))
  54 #define __W_STOPCODE(sig)       ((sig) << 8 | 0x7f)
  55 #define __WCOREFLAG             0x80
  56
  57
  58 #ifdef  __USE_BSD
  59
  60 #include <endian.h>
  61
  62 union wait
  63   {
  64     struct
  65       {
  66 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  67         unsigned int __w_termsig:7; /* Terminating signal.  */
  68         unsigned int __w_coredump:1; /* Set if dumped core.  */
  69         unsigned int __w_retcode:8; /* Return code if exited normally.  */
  70         unsigned int:16;
  71 #endif                          /* Little endian.  */
  72 #if     __BYTE_ORDER == __BIG_ENDIAN
  73         unsigned int:16;
  74         unsigned int __w_retcode:8;
  75         unsigned int __w_coredump:1;
  76         unsigned int __w_termsig:7;
  77 #endif                          /* Big endian.  */
  78       } __wait_terminated;
  79     struct
  80       {
  81 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  82         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  83         unsigned int __w_stopsig:8; /* Stopping signal.  */
  84         unsigned int:16;
  85 #endif                          /* Little endian.  */
  86 #if     __BYTE_ORDER == __BIG_ENDIAN
  87         unsigned int:16;
  88         unsigned int __w_stopsig:8; /* Stopping signal.  */
  89         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  90 #endif                          /* Big endian.  */
  91       } __wait_stopped;
  92   };
  93
  94 #define w_termsig       __wait_terminated.__w_termsig
  95 #define w_coredump      __wait_terminated.__w_coredump
  96 #define w_retcode       __wait_terminated.__w_retcode
  97 #define w_stopsig       __wait_stopped.__w_stopsig
  98 #define w_stopval       __wait_stopped.__w_stopval
  99
 100 #endif  /* Use BSD.  */
 101
 102
 103 #endif  /* waitstatus.h */