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4680 | right-hear | 1 | /* Compatibility definitions for System V `poll' interface. |
2 | Copyright (C) 1994,1996-2001,2004,2005,2006 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | |||
5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |||
10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |||
20 | #ifndef _SYS_POLL_H |
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21 | #define _SYS_POLL_H 1 |
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22 | |||
23 | #include |
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24 | |||
25 | /* Get the platform dependent bits of `poll'. */ |
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26 | #include |
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27 | #ifdef __USE_GNU |
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28 | /* Get the __sigset_t definition. */ |
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29 | # include |
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30 | /* Get the timespec definition. */ |
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31 | # define __need_timespec |
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32 | # include |
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33 | #endif |
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34 | |||
35 | |||
36 | /* Type used for the number of file descriptors. */ |
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37 | typedef unsigned long int nfds_t; |
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38 | |||
39 | /* Data structure describing a polling request. */ |
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40 | struct pollfd |
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41 | { |
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42 | int fd; /* File descriptor to poll. */ |
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43 | short int events; /* Types of events poller cares about. */ |
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44 | short int revents; /* Types of events that actually occurred. */ |
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45 | }; |
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46 | |||
47 | |||
48 | __BEGIN_DECLS |
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49 | |||
50 | /* Poll the file descriptors described by the NFDS structures starting at |
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51 | FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for |
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52 | an event to occur; if TIMEOUT is -1, block until an event occurs. |
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53 | Returns the number of file descriptors with events, zero if timed out, |
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54 | or -1 for errors. |
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55 | |||
56 | This function is a cancellation point and therefore not marked with |
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57 | __THROW. */ |
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58 | extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout); |
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59 | |||
60 | #ifdef __USE_GNU |
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61 | /* Like poll, but before waiting the threads signal mask is replaced |
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62 | with that specified in the fourth parameter. For better usability, |
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63 | the timeout value is specified using a TIMESPEC object. |
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64 | |||
65 | This function is a cancellation point and therefore not marked with |
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66 | __THROW. */ |
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67 | extern int ppoll (struct pollfd *__fds, nfds_t __nfds, |
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68 | __const struct timespec *__timeout, |
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69 | __const __sigset_t *__ss); |
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70 | #endif |
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71 | |||
72 | __END_DECLS |
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73 | |||
74 | #endif /* sys/poll.h */ |