| 1 | /* Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 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 |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #ifndef _SYS_POLL_H |
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| 19 | # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead." |
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| 20 | #endif |
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| 21 | |
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| 22 | /* Event types that can be polled for. These bits may be set in `events' |
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| 23 | to indicate the interesting event types; they will appear in `revents' |
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| 24 | to indicate the status of the file descriptor. */ |
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| 25 | #define POLLIN 0x001 /* There is data to read. */ |
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| 26 | #define POLLPRI 0x002 /* There is urgent data to read. */ |
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| 27 | #define POLLOUT 0x004 /* Writing now will not block. */ |
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| 28 | |
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| 29 | #if defined __USE_XOPEN || defined __USE_XOPEN2K8 |
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| 30 | /* These values are defined in XPG4.2. */ |
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| 31 | # define POLLRDNORM 0x040 /* Normal data may be read. */ |
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| 32 | # define POLLRDBAND 0x080 /* Priority data may be read. */ |
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| 33 | # define POLLWRNORM 0x100 /* Writing now will not block. */ |
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| 34 | # define POLLWRBAND 0x200 /* Priority data may be written. */ |
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| 35 | #endif |
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| 36 | |
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| 37 | #ifdef __USE_GNU |
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| 38 | /* These are extensions for Linux. */ |
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| 39 | # define POLLMSG 0x400 |
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| 40 | # define POLLREMOVE 0x1000 |
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| 41 | # define POLLRDHUP 0x2000 |
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| 42 | #endif |
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| 43 | |
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| 44 | /* Event types always implicitly polled for. These bits need not be set in |
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| 45 | `events', but they will appear in `revents' to indicate the status of |
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| 46 | the file descriptor. */ |
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| 47 | #define POLLERR 0x008 /* Error condition. */ |
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| 48 | #define POLLHUP 0x010 /* Hung up. */ |
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| 49 | #define POLLNVAL 0x020 /* Invalid polling request. */ |
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| 50 | |
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