src/sysselect.h

   1 /* sysselect.h - System-dependent definitions for the select function.
   2    Copyright (C) 1995, 2001-2012  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 #if defined (DARWIN_OS)
  20 #undef init_process
  21 #endif
  22 #ifndef DOS_NT
  23 #include <sys/select.h>
  24 #endif
  25 #if defined (DARWIN_OS)
  26 #define init_process emacs_init_process
  27 #endif
  28
  29 /* The w32 build defines select stuff in w32.h, which is included
  30    where w32 needs it, but not where sysselect.h is included.  The w32
  31    definitions in w32.h are incompatible with the below.  */
  32 #ifndef WINDOWSNT
  33 #ifdef FD_SET
  34 #ifdef FD_SETSIZE
  35 #define MAXDESC FD_SETSIZE
  36 #else
  37 #define MAXDESC 64
  38 #endif
  39 #define SELECT_TYPE fd_set
  40 #else /* no FD_SET */
  41 #define MAXDESC 32
  42 #define SELECT_TYPE int
  43
  44 /* Define the macros to access a single-int bitmap of descriptors.  */
  45 #define FD_SET(n, p) (*(p) |= (1 << (n)))
  46 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
  47 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
  48 #define FD_ZERO(p) (*(p) = 0)
  49 #endif /* no FD_SET */
  50 #endif /* not WINDOWSNT */
  51
  52 #if !defined (HAVE_SELECT)
  53 #define select sys_select
  54 #endif
  55
  56 #ifdef MSDOS
  57 #define pselect sys_select
  58 #endif