src/w32.h

   1 /* Support routines for the NT version of Emacs.
   2    Copyright (C) 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* File descriptor set emulation.  */
  21
  22 #ifdef FD_SET
  23 /* We could get this from param.h, but better not to depend on finding that.
  24    And better not to risk that it might define other symbols used in this
  25    file.  */
  26 #ifdef FD_SETSIZE
  27 #define MAXDESC FD_SETSIZE
  28 #else
  29 #define MAXDESC 64
  30 #endif
  31 #define SELECT_TYPE fd_set
  32 #else /* no FD_SET */
  33 #define MAXDESC 32
  34 #define SELECT_TYPE int
  35
  36 /* Define the macros to access a single-int bitmap of descriptors.  */
  37 #define FD_SET(n, p) (*(p) |= (1 << (n)))
  38 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
  39 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
  40 #define FD_ZERO(p) (*(p) = 0)
  41 #endif /* no FD_SET */
  42
  43 /* Prepare our standard handles for proper inheritance by child processes.  */
  44 extern void prepare_standard_handles (int in, int out,
  45                                       int err, HANDLE handles[4]);
  46
  47 /* Reset our standard handles to their original state.  */
  48 extern void reset_standard_handles (int in, int out,
  49                                     int err, HANDLE handles[4]);
  50