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5496 | leency | 1 | /* Copyright (C) 1997, 2001, 2006 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
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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 |
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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 | |||
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 | |||
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, write to the Free |
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16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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17 | 02111-1307 USA. */ |
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18 | |||
19 | #ifndef _SYS_POLL_H |
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20 | # error "Never use |
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21 | #endif |
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22 | |||
23 | /* Event types that can be polled for. These bits may be set in `events' |
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24 | to indicate the interesting event types; they will appear in `revents' |
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25 | to indicate the status of the file descriptor. */ |
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26 | #define POLLIN 0x001 /* There is data to read. */ |
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27 | #define POLLPRI 0x002 /* There is urgent data to read. */ |
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28 | #define POLLOUT 0x004 /* Writing now will not block. */ |
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29 | |||
30 | #ifdef __USE_XOPEN |
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31 | /* These values are defined in XPG4.2. */ |
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32 | # define POLLRDNORM 0x040 /* Normal data may be read. */ |
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33 | # define POLLRDBAND 0x080 /* Priority data may be read. */ |
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34 | # define POLLWRNORM 0x100 /* Writing now will not block. */ |
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35 | # define POLLWRBAND 0x200 /* Priority data may be written. */ |
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36 | #endif |
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37 | |||
38 | #ifdef __USE_GNU |
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39 | /* These are extensions for Linux. */ |
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40 | # define POLLMSG 0x400 |
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41 | # define POLLREMOVE 0x1000 |
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42 | # define POLLRDHUP 0x2000 |
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43 | #endif |
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44 | |||
45 | /* Event types always implicitly polled for. These bits need not be set in |
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46 | `events', but they will appear in `revents' to indicate the status of |
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47 | the file descriptor. */ |
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48 | #define POLLERR 0x008 /* Error condition. */ |
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49 | #define POLLHUP 0x010 /* Hung up. */ |
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50 | #define POLLNVAL 0x020 /* Invalid polling request. */ |