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[emacs.git] / src / sysselect.h
blob5aa9eb4aee71d2b567c24ed03c166049d312c29e
1 /* sysselect.h - System-dependent definitions for the select function.
2 Copyright (C) 1995 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 2, or (at your option)
9 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; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #ifdef HAVE_SYS_SELECT
22 #include <sys/select.h>
23 #endif
25 #ifdef FD_SET
26 #ifdef FD_SETSIZE
27 #define MAXDESC FD_SETSIZE
28 #else
29 #define MAXDESC 64
30 #endif
31 #define SELECT_TYPE fd_set
32 #else /* no FD_SET */
33 #define MAXDESC 32
34 #define SELECT_TYPE int
36 /* Define the macros to access a single-int bitmap of descriptors. */
37 #define FD_SET(n, p) (*(p) |= (1 << (n)))
38 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
39 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
40 #define FD_ZERO(p) (*(p) = 0)
41 #endif /* no FD_SET */
43 #if !defined (HAVE_SELECT) || defined (BROKEN_SELECT_NON_X)
44 #define select sys_select
45 #endif
47 /* arch-tag: 36d05500-8cf6-4847-8e78-6721f18c06ef
48 (do not change this comment) */