| 1 | /* sysselect.h - System-dependent definitions for the select function. |
| 2 | Copyright (C) 1995, 2001-2013 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 | #ifndef DOS_NT |
| 20 | #include <sys/select.h> |
| 21 | #endif |
| 22 | |
| 23 | /* The w32 build defines select stuff in w32.h, which is included |
| 24 | where w32 needs it, but not where sysselect.h is included. The w32 |
| 25 | definitions in w32.h are incompatible with the below. */ |
| 26 | #ifndef WINDOWSNT |
| 27 | #ifdef FD_SET |
| 28 | #ifdef FD_SETSIZE |
| 29 | #define MAXDESC FD_SETSIZE |
| 30 | #else |
| 31 | #define MAXDESC 64 |
| 32 | #endif |
| 33 | #define SELECT_TYPE fd_set |
| 34 | #else /* no FD_SET */ |
| 35 | #define MAXDESC 32 |
| 36 | #define SELECT_TYPE int |
| 37 | |
| 38 | /* Define the macros to access a single-int bitmap of descriptors. */ |
| 39 | #define FD_SET(n, p) (*(p) |= (1 << (n))) |
| 40 | #define FD_CLR(n, p) (*(p) &= ~(1 << (n))) |
| 41 | #define FD_ISSET(n, p) (*(p) & (1 << (n))) |
| 42 | #define FD_ZERO(p) (*(p) = 0) |
| 43 | #endif /* no FD_SET */ |
| 44 | #endif /* not WINDOWSNT */ |
| 45 | |
| 46 | #if !defined (HAVE_SELECT) |
| 47 | #define select sys_select |
| 48 | #endif |
| 49 | |
| 50 | #ifdef MSDOS |
| 51 | #define pselect sys_select |
| 52 | #endif |