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1 | /* Copyright (C) 1997-2022 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 | <https://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. */ |
43 |
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