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 /* The w32 build defines select stuff in w32.h, which is included
  31    where w32 needs it, but not where sysselect.h is included.  The w32
  32    definitions in w32.h are incompatible with the below.  */
  33 #ifndef WINDOWSNT
  34 #ifdef FD_SET
  35 #ifdef FD_SETSIZE
  36 #define MAXDESC FD_SETSIZE
  37 #else
  38 #define MAXDESC 64
  39 #endif
  40 #define SELECT_TYPE fd_set
  41 #else /* no FD_SET */
  42 #define MAXDESC 32
  43 #define SELECT_TYPE int
  44
  45 /* Define the macros to access a single-int bitmap of descriptors.  */
  46 #define FD_SET(n, p) (*(p) |= (1 << (n)))
  47 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
  48 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
  49 #define FD_ZERO(p) (*(p) = 0)
  50 #endif /* no FD_SET */
  51 #endif /* not WINDOWSNT */
  52
  53 #if !defined (HAVE_SELECT)
  54 #define select sys_select
  55 #endif
  56
  57 /* arch-tag: 36d05500-8cf6-4847-8e78-6721f18c06ef
  58    (do not change this comment) */