| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Compatibility definitions for System V `poll' interface. |
| 2 | Copyright (C) 1994-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _SYS_POLL_H |
| 20 | #define _SYS_POLL_H 1 |
| 21 | |
| 22 | #include <features.h> |
| 23 | |
| 24 | /* Get the platform dependent bits of `poll'. */ |
| 25 | #include <bits/poll.h> |
| 26 | #ifdef __USE_GNU |
| 27 | /* Get the __sigset_t definition. */ |
| 28 | # include <bits/sigset.h> |
| 29 | /* Get the timespec definition. */ |
| 30 | # define __need_timespec |
| 31 | # include <time.h> |
| 32 | #endif |
| 33 | |
| 34 | |
| 35 | /* Type used for the number of file descriptors. */ |
| 36 | typedef unsigned long int nfds_t; |
| 37 | |
| 38 | /* Data structure describing a polling request. */ |
| 39 | struct pollfd |
| 40 | { |
| 41 | int fd; /* File descriptor to poll. */ |
| 42 | short int events; /* Types of events poller cares about. */ |
| 43 | short int revents; /* Types of events that actually occurred. */ |
| 44 | }; |
| 45 | |
| 46 | |
| 47 | __BEGIN_DECLS |
| 48 | |
| 49 | /* Poll the file descriptors described by the NFDS structures starting at |
| 50 | FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for |
| 51 | an event to occur; if TIMEOUT is -1, block until an event occurs. |
| 52 | Returns the number of file descriptors with events, zero if timed out, |
| 53 | or -1 for errors. |
| 54 | |
| 55 | This function is a cancellation point and therefore not marked with |
| 56 | __THROW. */ |
| 57 | extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout); |
| 58 | |
| 59 | #ifdef __USE_GNU |
| 60 | /* Like poll, but before waiting the threads signal mask is replaced |
| 61 | with that specified in the fourth parameter. For better usability, |
| 62 | the timeout value is specified using a TIMESPEC object. |
| 63 | |
| 64 | This function is a cancellation point and therefore not marked with |
| 65 | __THROW. */ |
| 66 | extern int ppoll (struct pollfd *__fds, nfds_t __nfds, |
| 67 | const struct timespec *__timeout, |
| 68 | const __sigset_t *__ss); |
| 69 | #endif |
| 70 | |
| 71 | __END_DECLS |
| 72 | |
| 73 | |
| 74 | /* Define some inlines helping to catch common problems. */ |
| 75 | #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function |
| 76 | # include <bits/poll2.h> |
| 77 | #endif |
| 78 | |
| 79 | #endif /* sys/poll.h */ |