bits/waitstatus.h

   1 /* Definitions of status bits for `wait' et al.
   2    Copyright (C) 1992, 1994, 1996, 1997 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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_WAIT_H
  21 #error "Never use <bits/waitstatus.h> directly; include <sys/wait.h> instead."
  22 #endif
  23
  24
  25 /* Everything extant so far uses these same bits.  */
  26
  27
  28 /* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
  29 #define __WEXITSTATUS(status)   (((status) & 0xff00) >> 8)
  30
  31 /* If WIFSIGNALED(STATUS), the terminating signal.  */
  32 #define __WTERMSIG(status)      ((status) & 0x7f)
  33
  34 /* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
  35 #define __WSTOPSIG(status)      __WEXITSTATUS(status)
  36
  37 /* Nonzero if STATUS indicates normal termination.  */
  38 #define __WIFEXITED(status)     (__WTERMSIG(status) == 0)
  39
  40 /* Nonzero if STATUS indicates termination by a signal.  */
  41 #ifdef  __GNUC__
  42 #define __WIFSIGNALED(status)                                                 \
  43   (__extension__ ({ int __status = (status);                                  \
  44                     !__WIFSTOPPED(__status) && !__WIFEXITED(__status); }))
  45 #else   /* Not GCC.  */
  46 #define __WIFSIGNALED(status)   (!__WIFSTOPPED(status) && !__WIFEXITED(status))
  47 #endif  /* GCC.  */
  48
  49 /* Nonzero if STATUS indicates the child is stopped.  */
  50 #define __WIFSTOPPED(status)    (((status) & 0xff) == 0x7f)
  51
  52 /* Nonzero if STATUS indicates the child dumped core.  */
  53 #define __WCOREDUMP(status)     ((status) & __WCOREFLAG)
  54
  55 /* Macros for constructing status values.  */
  56 #define __W_EXITCODE(ret, sig)  ((ret) << 8 | (sig))
  57 #define __W_STOPCODE(sig)       ((sig) << 8 | 0x7f)
  58 #define __WCOREFLAG             0x80
  59
  60
  61 #ifdef  __USE_BSD
  62
  63 #include <endian.h>
  64
  65 union wait
  66   {
  67     int w_status;
  68     struct
  69       {
  70 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  71         unsigned int __w_termsig:7; /* Terminating signal.  */
  72         unsigned int __w_coredump:1; /* Set if dumped core.  */
  73         unsigned int __w_retcode:8; /* Return code if exited normally.  */
  74         unsigned int:16;
  75 #endif                          /* Little endian.  */
  76 #if     __BYTE_ORDER == __BIG_ENDIAN
  77         unsigned int:16;
  78         unsigned int __w_retcode:8;
  79         unsigned int __w_coredump:1;
  80         unsigned int __w_termsig:7;
  81 #endif                          /* Big endian.  */
  82       } __wait_terminated;
  83     struct
  84       {
  85 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  86         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  87         unsigned int __w_stopsig:8; /* Stopping signal.  */
  88         unsigned int:16;
  89 #endif                          /* Little endian.  */
  90 #if     __BYTE_ORDER == __BIG_ENDIAN
  91         unsigned int:16;
  92         unsigned int __w_stopsig:8; /* Stopping signal.  */
  93         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  94 #endif                          /* Big endian.  */
  95       } __wait_stopped;
  96   };
  97
  98 #define w_termsig       __wait_terminated.__w_termsig
  99 #define w_coredump      __wait_terminated.__w_coredump
 100 #define w_retcode       __wait_terminated.__w_retcode
 101 #define w_stopsig       __wait_stopped.__w_stopsig
 102 #define w_stopval       __wait_stopped.__w_stopval
 103
 104 #endif  /* Use BSD.  */