src/sysselect.h

   1 /* sysselect.h - System-dependent definitions for the select function.
   2    Copyright (C) 1995 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 #ifdef HAVE_SYS_SELECT
  21 #include <sys/select.h>
  22 #endif
  23
  24 #ifdef FD_SET
  25 #ifdef FD_SETSIZE
  26 #define MAXDESC FD_SETSIZE
  27 #else
  28 #define MAXDESC 64
  29 #endif
  30 #define SELECT_TYPE fd_set
  31 #else /* no FD_SET */
  32 #define MAXDESC 32
  33 #define SELECT_TYPE int
  34
  35 /* Define the macros to access a single-int bitmap of descriptors.  */
  36 #define FD_SET(n, p) (*(p) |= (1 << (n)))
  37 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
  38 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
  39 #define FD_ZERO(p) (*(p) = 0)
  40 #endif /* no FD_SET */
  41
  42 #if !defined (HAVE_SELECT) || defined (BROKEN_SELECT_NON_X)
  43 #define select sys_select
  44 #endif