waitstatus.h
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上传日期:2009-04-28
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- /* Definitions of status bits for `wait' et al.
- Copyright (C) 1992,1994,1996,1997,2000,2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #if !defined _SYS_WAIT_H && !defined _STDLIB_H
- # error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
- #endif
- /* Everything extant so far uses these same bits. */
- /* If WIFEXITED(STATUS), the low-order 8 bits of the status. */
- #define __WEXITSTATUS(status) (((status) & 0xff00) >> 8)
- /* If WIFSIGNALED(STATUS), the terminating signal. */
- #define __WTERMSIG(status) ((status) & 0x7f)
- /* If WIFSTOPPED(STATUS), the signal that stopped the child. */
- #define __WSTOPSIG(status) __WEXITSTATUS(status)
- /* Nonzero if STATUS indicates normal termination. */
- #define __WIFEXITED(status) (__WTERMSIG(status) == 0)
- /* Nonzero if STATUS indicates termination by a signal. */
- #define __WIFSIGNALED(status)
- (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
- /* Nonzero if STATUS indicates the child is stopped. */
- #define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
- /* Nonzero if STATUS indicates the child continued after a stop. We only
- define this if <bits/waitflags.h> provides the WCONTINUED flag bit. */
- #ifdef WCONTINUED
- # define __WIFCONTINUED(status) ((status) == __W_CONTINUED)
- #endif
- /* Nonzero if STATUS indicates the child dumped core. */
- #define __WCOREDUMP(status) ((status) & __WCOREFLAG)
- /* Macros for constructing status values. */
- #define __W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
- #define __W_STOPCODE(sig) ((sig) << 8 | 0x7f)
- #define __W_CONTINUED 0xffff
- #define __WCOREFLAG 0x80
- #ifdef __USE_BSD
- # include <endian.h>
- union wait
- {
- int w_status;
- struct
- {
- # if __BYTE_ORDER == __LITTLE_ENDIAN
- unsigned int __w_termsig:7; /* Terminating signal. */
- unsigned int __w_coredump:1; /* Set if dumped core. */
- unsigned int __w_retcode:8; /* Return code if exited normally. */
- unsigned int:16;
- # endif /* Little endian. */
- # if __BYTE_ORDER == __BIG_ENDIAN
- unsigned int:16;
- unsigned int __w_retcode:8;
- unsigned int __w_coredump:1;
- unsigned int __w_termsig:7;
- # endif /* Big endian. */
- } __wait_terminated;
- struct
- {
- # if __BYTE_ORDER == __LITTLE_ENDIAN
- unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
- unsigned int __w_stopsig:8; /* Stopping signal. */
- unsigned int:16;
- # endif /* Little endian. */
- # if __BYTE_ORDER == __BIG_ENDIAN
- unsigned int:16;
- unsigned int __w_stopsig:8; /* Stopping signal. */
- unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
- # endif /* Big endian. */
- } __wait_stopped;
- };
- # define w_termsig __wait_terminated.__w_termsig
- # define w_coredump __wait_terminated.__w_coredump
- # define w_retcode __wait_terminated.__w_retcode
- # define w_stopsig __wait_stopped.__w_stopsig
- # define w_stopval __wait_stopped.__w_stopval
- #endif /* Use BSD. */