src/sysselect.h

   1 /* sysselect.h - System-dependent definitions for the select function.
   2    Copyright (C) 1995, 2001-2014 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 3 of the License, or
   9 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef DOS_NT
  20 #include <sys/select.h>
  21 #endif
  22
  23 /* The w32 build defines select stuff in w32.h, which is included
  24    where w32 needs it, but not where sysselect.h is included.  The w32
  25    definitions in w32.h are incompatible with the below.  */
  26 #ifndef WINDOWSNT
  27 #ifdef FD_SET
  28 #ifndef FD_SETSIZE
  29 #define FD_SETSIZE 64
  30 #endif
  31 #else /* no FD_SET */
  32 #define FD_SETSIZE 32
  33 typedef int fd_set;
  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 #endif /* not WINDOWSNT */
  42
  43 #if !defined (HAVE_SELECT)
  44 #define select sys_select
  45 #endif
  46
  47 #ifdef MSDOS
  48 #define pselect sys_select
  49 #endif