bits/waitstatus.h

   1 /* Definitions of status bits for `wait' et al.
   2    Copyright (C) 1992-2013 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined _SYS_WAIT_H && !defined _STDLIB_H
  20 # error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
  21 #endif
  22
  23
  24 /* Everything extant so far uses these same bits.  */
  25
  26
  27 /* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
  28 #define __WEXITSTATUS(status)   (((status) & 0xff00) >> 8)
  29
  30 /* If WIFSIGNALED(STATUS), the terminating signal.  */
  31 #define __WTERMSIG(status)      ((status) & 0x7f)
  32
  33 /* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
  34 #define __WSTOPSIG(status)      __WEXITSTATUS(status)
  35
  36 /* Nonzero if STATUS indicates normal termination.  */
  37 #define __WIFEXITED(status)     (__WTERMSIG(status) == 0)
  38
  39 /* Nonzero if STATUS indicates termination by a signal.  */
  40 #define __WIFSIGNALED(status) \
  41   (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
  42
  43 /* Nonzero if STATUS indicates the child is stopped.  */
  44 #define __WIFSTOPPED(status)    (((status) & 0xff) == 0x7f)
  45
  46 /* Nonzero if STATUS indicates the child continued after a stop.  We only
  47    define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
  48 #ifdef WCONTINUED
  49 # define __WIFCONTINUED(status) ((status) == __W_CONTINUED)
  50 #endif
  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 __W_CONTINUED           0xffff
  59 #define __WCOREFLAG             0x80
  60
  61
  62 #ifdef  __USE_BSD
  63
  64 # include <endian.h>
  65
  66 union wait
  67   {
  68     int w_status;
  69     struct
  70       {
  71 # if    __BYTE_ORDER == __LITTLE_ENDIAN
  72         unsigned int __w_termsig:7; /* Terminating signal.  */
  73         unsigned int __w_coredump:1; /* Set if dumped core.  */
  74         unsigned int __w_retcode:8; /* Return code if exited normally.  */
  75         unsigned int:16;
  76 # endif                         /* Little endian.  */
  77 # if    __BYTE_ORDER == __BIG_ENDIAN
  78         unsigned int:16;
  79         unsigned int __w_retcode:8;
  80         unsigned int __w_coredump:1;
  81         unsigned int __w_termsig:7;
  82 # endif                         /* Big endian.  */
  83       } __wait_terminated;
  84     struct
  85       {
  86 # if    __BYTE_ORDER == __LITTLE_ENDIAN
  87         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  88         unsigned int __w_stopsig:8; /* Stopping signal.  */
  89         unsigned int:16;
  90 # endif                         /* Little endian.  */
  91 # if    __BYTE_ORDER == __BIG_ENDIAN
  92         unsigned int:16;
  93         unsigned int __w_stopsig:8; /* Stopping signal.  */
  94         unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
  95 # endif                         /* Big endian.  */
  96       } __wait_stopped;
  97   };
  98
  99 # define w_termsig      __wait_terminated.__w_termsig
 100 # define w_coredump     __wait_terminated.__w_coredump
 101 # define w_retcode      __wait_terminated.__w_retcode
 102 # define w_stopsig      __wait_stopped.__w_stopsig
 103 # define w_stopval      __wait_stopped.__w_stopval
 104
 105 #endif  /* Use BSD.  */