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[bpt/emacs.git] / src / syswait.h

/* Define wait system call interface for Emacs.
   Copyright (C) 1993, 1994, 1995, 2000 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Define the structure that the wait system call stores.
   On many systems, there is a structure defined for this.
   But on vanilla-ish USG systems there is not.  */

#ifndef EMACS_SYSWAIT_H
#define EMACS_SYSWAIT_H

#ifndef VMS

/* Try the approach recommended by autoconf.  If this doesn't cause
   trouble anywhere, remove the original code, which is #if'd out
   below.  */

#if 1
#include <sys/types.h>

/* Old code included a comment that HPUX version 7 has broken
   definitions of some of the macros and `the convex' does too.
   HAVE_SYS_WAIT_H probably won't be defined on them if they still get
   used, but for safety...  -- fx */
#if (defined (HPUX) && !defined (HPUX8)) || defined (convex)
#undef HAVE_SYS_WAIT_H
#endif

#if defined HAVE_SYS_WAIT_H	/* We have sys/wait.h with POSIXoid
				   definitions. */

#include <sys/wait.h>
#ifndef WCOREDUMP		/* not POSIX */
#define WCOREDUMP(status) ((status) & 0x80)
#endif

#else  /* !HAVE_SYS_WAIT_H */

/* Note that sys/wait.h may still be included by stdlib.h or something
   according to XPG.  */

#undef WEXITSTATUS
#define WEXITSTATUS(status) (((status)  & 0xff00) >> 8)
#undef WIFEXITED
#define WIFEXITED(status) (WTERMSIG(status) == 0)
#undef WIFSTOPPED
#define WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
#undef WIFSIGNALED
#define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
#undef WSTOPSIG
#define WSTOPSIG(status) WEXITSTATUS(status)
#undef WTERMSIG
#define WTERMSIG(status) ((status) & 0x7f)
#undef WCOREDUMP
#define WCOREDUMP(status) ((status) & 0x80)
#endif /* HAVE_SYS_WAIT_H */

#undef WAITTYPE
#define WAITTYPE int
#undef WRETCODE
#define WRETCODE(status) WEXITSTATUS (status)

#else  /* !1 */

#ifndef WAITTYPE

#ifdef WAIT_USE_INT
/* Some systems have  union wait  in their header, but we should use
   int regardless of that.  */
#include <sys/wait.h>
#define WAITTYPE int
#define WRETCODE(w) WEXITSTATUS (w)

#else /* not WAIT_USE_INT */

#if (!defined (BSD_SYSTEM) && !defined (UNIPLUS) && !defined (STRIDE) && !(defined (HPUX) && !defined (NOMULTIPLEJOBS)) && !defined (HAVE_WAIT_HEADER))
#define WAITTYPE int
#define WIFSTOPPED(w) ((w&0377) == 0177)
#define WIFSIGNALED(w) ((w&0377) != 0177 && (w&~0377) == 0)
#define WIFEXITED(w) ((w&0377) == 0)
#define WRETCODE(w) (w >> 8)
#define WSTOPSIG(w) (w >> 8)
#define WTERMSIG(w) (w & 0177)
#ifndef WCOREDUMP
#define WCOREDUMP(w) ((w&0200) != 0)
#endif

#else 

#ifdef BSD4_1
#include <wait.h>
#else
#include <sys/wait.h>
#endif /* not BSD 4.1 */

#define WAITTYPE union wait
#define WRETCODE(w) w.w_retcode
#undef WCOREDUMP		/* Later BSDs define this name differently.  */
#define WCOREDUMP(w) w.w_coredump

#if defined (HPUX) || defined (convex)
/* HPUX version 7 has broken definitions of these.  */
/* pvogel@convex.com says the convex does too.  */
#undef WTERMSIG
#undef WSTOPSIG
#undef WIFSTOPPED
#undef WIFSIGNALED
#undef WIFEXITED
#endif /* HPUX | convex */

#ifndef WTERMSIG
#define WTERMSIG(w) w.w_termsig
#endif
#ifndef WSTOPSIG
#define WSTOPSIG(w) w.w_stopsig
#endif
#ifndef WIFSTOPPED
#define WIFSTOPPED(w) (WTERMSIG (w) == 0177)
#endif
#ifndef WIFSIGNALED
#define WIFSIGNALED(w) (WTERMSIG (w) != 0177 && (WSTOPSIG (w)) == 0)
#endif
#ifndef WIFEXITED
#define WIFEXITED(w) (WTERMSIG (w) == 0)
#endif
#endif /* BSD_SYSTEM || UNIPLUS || STRIDE || HPUX */
#endif /* not WAIT_USE_INT */
#endif /* no WAITTYPE */

#endif /* 1 */

#else /* VMS */

#define WAITTYPE int
#define WIFSTOPPED(w) 0
#define WIFSIGNALED(w) 0
#define WIFEXITED(w) ((w) != -1)
#define WRETCODE(w) (w)
#define WSTOPSIG(w) (w)
#define WCOREDUMP(w) 0
#define WTERMSIG(w) (w)
#include <ssdef.h>
#include <iodef.h>
#include <clidef.h>
#include "vmsproc.h"

#endif /* VMS */

#endif /* EMACS_SYSWAIT_H */