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6d7e8eda | 1 | /* Copyright (C) 1997-2023 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
39e16978 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
39e16978 | 17 | |
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18 | #ifndef _SYS_POLL_H |
19 | # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead." | |
20 | #endif | |
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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 | ||
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29 | #if defined __USE_XOPEN || defined __USE_XOPEN2K8 |
30 | /* These values are defined in XPG4.2 and later. */ | |
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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 | |
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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. */ |