| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1997-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _SYS_POLL_H |
| 19 | # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead." |
| 20 | #endif |
| 21 | |
| 22 | /* Event types that can be polled for. These bits may be set in `events' |
| 23 | to indicate the interesting event types; they will appear in `revents' |
| 24 | to indicate the status of the file descriptor. */ |
| 25 | #define POLLIN 01 /* There is data to read. */ |
| 26 | #define POLLPRI 02 /* There is urgent data to read. */ |
| 27 | #define POLLOUT 04 /* Writing now will not block. */ |
| 28 | |
| 29 | #if defined __USE_XOPEN || defined __USE_XOPEN2K8 |
| 30 | /* These values are defined in XPG4.2 and later. */ |
| 31 | # define POLLRDNORM POLLIN /* Normal data may be read. */ |
| 32 | # define POLLRDBAND POLLPRI /* Priority data may be read. */ |
| 33 | # define POLLWRNORM POLLOUT /* Writing now will not block. */ |
| 34 | # define POLLWRBAND POLLOUT /* Priority data may be written. */ |
| 35 | #endif |
| 36 | |
| 37 | /* Event types always implicitly polled for. These bits need not be set in |
| 38 | `events', but they will appear in `revents' to indicate the status of |
| 39 | the file descriptor. */ |
| 40 | #define POLLERR 010 /* Error condition. */ |
| 41 | #define POLLHUP 020 /* Hung up. */ |
| 42 | #define POLLNVAL 040 /* Invalid polling request. */ |