/* filecntl.h - Definitions to set file descriptors to close-on-exec. */

/* Copyright (C) 1993 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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.

   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#if !defined (_FILECNTL_H_)
#define _FILECNTL_H_

#include <fcntl.h>

/* Definitions to set file descriptors to close-on-exec, the Posix way. */
#if !defined (FD_CLOEXEC)
#define FD_CLOEXEC     1
#endif

#define FD_NCLOEXEC    0

#define SET_CLOSE_ON_EXEC(fd)  (fcntl ((fd), F_SETFD, FD_CLOEXEC))
#define SET_OPEN_ON_EXEC(fd)   (fcntl ((fd), F_SETFD, FD_NCLOEXEC))

/* DOS applies the inherit bit to fd and any other descriptors that
   refer to the same file. Bash expects Posix behavior instead, so
   it's best not to use this feature.  */
#ifdef __MSDOS__
#undef SET_CLOSE_ON_EXEC
#define SET_CLOSE_ON_EXEC(fd)
#endif

/* How to open a file in non-blocking mode, the Posix.1 way. */
#if !defined (O_NONBLOCK)
#  if defined (O_NDELAY)
#    define O_NONBLOCK O_NDELAY
#  else
#    define O_NONBLOCK 0
#  endif
#endif

#endif /* ! _FILECNTL_H_ */
