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[emacs.git] / src / sysselect.h
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1 /* sysselect.h - System-dependent definitions for the select function.
2 Copyright (C) 1995, 2001-2011 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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.
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.
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/>. */
19 #ifdef HAVE_SYS_SELECT_H
20 #if defined (DARWIN_OS)
21 #undef init_process
22 #endif
23 #include <sys/select.h>
24 #if defined (DARWIN_OS)
25 #define init_process emacs_init_process
26 #endif
27 #endif
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
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 */
52 #if !defined (HAVE_SELECT)
53 #define select sys_select
54 #endif