waitstatus.h

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/* Definitions of status bits for `wait' et al.
Copyright (C) 1992, 1994 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/* Everything extant so far uses these same bits.  */

#ifndef	_WAITSTATUS_H
#define	_WAITSTATUS_H

/* 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.  */
#ifdef	__GNUC__
#define	__WIFSIGNALED(status)						      \
  (__extension__ ({ int __stat = (status);				      \
		    !__WIFSTOPPED(__stat) && !__WIFEXITED(__stat); }))
#else	/* Not GCC.  */
#define	__WIFSIGNALED(status)	(!__WIFSTOPPED(status) && !__WIFEXITED(status))
#endif	/* GCC.  */

/* Nonzero if STATUS indicates the child is stopped.  */
#define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)

/* 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	__WCOREFLAG		0x80


#ifdef	__USE_BSD

#include <endian.h>

union wait
  {
    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.  */


#endif	/* waitstatus.h */