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a044c713b0
* posix/sys/wait.h [__WIFCONTINUED] (WIFCONTINUED): New macro. * stdlib/stdlib.h [__WIFCONTINUED] (WIFCONTINUED): New macro. * sysdeps/generic/bits/waitstatus.h (__W_CONTINUED): New macro. [WCONTINUED] (__WIFCONTINUED): New macro. (__WIFSIGNALED): Rewritten to exclude __W_CONTINUED value, and have no branches.
107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/* Definitions of status bits for `wait' et al.
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Copyright (C) 1992,1994,1996,1997,2000,2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#if !defined _SYS_WAIT_H && !defined _STDLIB_H
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# error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
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#endif
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/* Everything extant so far uses these same bits. */
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/* If WIFEXITED(STATUS), the low-order 8 bits of the status. */
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#define __WEXITSTATUS(status) (((status) & 0xff00) >> 8)
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/* If WIFSIGNALED(STATUS), the terminating signal. */
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#define __WTERMSIG(status) ((status) & 0x7f)
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/* If WIFSTOPPED(STATUS), the signal that stopped the child. */
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#define __WSTOPSIG(status) __WEXITSTATUS(status)
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/* Nonzero if STATUS indicates normal termination. */
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#define __WIFEXITED(status) (__WTERMSIG(status) == 0)
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/* Nonzero if STATUS indicates termination by a signal. */
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#define __WIFSIGNALED(status) \
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(((signed char) ((((((status) + 1) & 0xffff) - 1) & 0x7f) + 1) >> 1) > 0)
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/* Nonzero if STATUS indicates the child is stopped. */
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#define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
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/* Nonzero if STATUS indicates the child continued after a stop. We only
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define this if <bits/waitflags.h> provides the WCONTINUED flag bit. */
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#ifdef WCONTINUED
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# define __WIFCONTINUED(status) ((status) == __W_CONTINUED)
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#endif
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/* Nonzero if STATUS indicates the child dumped core. */
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#define __WCOREDUMP(status) ((status) & __WCOREFLAG)
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/* Macros for constructing status values. */
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#define __W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
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#define __W_STOPCODE(sig) ((sig) << 8 | 0x7f)
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#define __W_CONTINUED 0xffff
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#define __WCOREFLAG 0x80
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#ifdef __USE_BSD
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# include <endian.h>
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union wait
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{
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int w_status;
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struct
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{
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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unsigned int __w_termsig:7; /* Terminating signal. */
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unsigned int __w_coredump:1; /* Set if dumped core. */
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unsigned int __w_retcode:8; /* Return code if exited normally. */
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unsigned int:16;
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# endif /* Little endian. */
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned int:16;
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unsigned int __w_retcode:8;
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unsigned int __w_coredump:1;
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unsigned int __w_termsig:7;
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# endif /* Big endian. */
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} __wait_terminated;
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struct
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{
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
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unsigned int __w_stopsig:8; /* Stopping signal. */
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unsigned int:16;
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# endif /* Little endian. */
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned int:16;
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unsigned int __w_stopsig:8; /* Stopping signal. */
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unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
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# endif /* Big endian. */
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} __wait_stopped;
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};
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# define w_termsig __wait_terminated.__w_termsig
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# define w_coredump __wait_terminated.__w_coredump
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# define w_retcode __wait_terminated.__w_retcode
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# define w_stopsig __wait_stopped.__w_stopsig
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# define w_stopval __wait_stopped.__w_stopval
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#endif /* Use BSD. */
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