src/sysselect.h

   1 /* sysselect.h - System-dependent definitions for the select function.
   2    Copyright (C) 1995, 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifdef HAVE_SYS_SELECT_H
  21 #if defined (DARWIN_OS)
  22 #undef init_process
  23 #endif
  24 #include <sys/select.h>
  25 #if defined (DARWIN_OS)
  26 #define init_process emacs_init_process
  27 #endif
  28 #endif
  29
  30 #ifdef FD_SET
  31 #ifdef FD_SETSIZE
  32 #define MAXDESC FD_SETSIZE
  33 #else
  34 #define MAXDESC 64
  35 #endif
  36 #define SELECT_TYPE fd_set
  37 #else /* no FD_SET */
  38 #define MAXDESC 32
  39 #define SELECT_TYPE int
  40
  41 /* Define the macros to access a single-int bitmap of descriptors.  */
  42 #define FD_SET(n, p) (*(p) |= (1 << (n)))
  43 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
  44 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
  45 #define FD_ZERO(p) (*(p) = 0)
  46 #endif /* no FD_SET */
  47
  48 #if !defined (HAVE_SELECT)
  49 #define select sys_select
  50 #endif
  51
  52 /* arch-tag: 36d05500-8cf6-4847-8e78-6721f18c06ef
  53    (do not change this comment) */