Viewing file:  waitstatus.h (3.47 KB) -rw-r--r--
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/* Definitions of status bits for `wait' et al.
Copyright (C) 1992-2016 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, see
<http://www.gnu.org/licenses/>. */
#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_MISC
# 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 misc. */
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