1 | /* Compatibility definitions for System V `poll' interface. |
2 | Copyright (C) 1994-2017 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 | #include <bits/types/struct_timespec.h> |
31 | #endif |
32 | |
33 | |
34 | /* Type used for the number of file descriptors. */ |
35 | typedef unsigned long int nfds_t; |
36 | |
37 | /* Data structure describing a polling request. */ |
38 | struct pollfd |
39 | { |
40 | int fd; /* File descriptor to poll. */ |
41 | short int events; /* Types of events poller cares about. */ |
42 | short int revents; /* Types of events that actually occurred. */ |
43 | }; |
44 | |
45 | |
46 | __BEGIN_DECLS |
47 | |
48 | /* Poll the file descriptors described by the NFDS structures starting at |
49 | FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for |
50 | an event to occur; if TIMEOUT is -1, block until an event occurs. |
51 | Returns the number of file descriptors with events, zero if timed out, |
52 | or -1 for errors. |
53 | |
54 | This function is a cancellation point and therefore not marked with |
55 | __THROW. */ |
56 | extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout); |
57 | |
58 | #ifdef __USE_GNU |
59 | /* Like poll, but before waiting the threads signal mask is replaced |
60 | with that specified in the fourth parameter. For better usability, |
61 | the timeout value is specified using a TIMESPEC object. |
62 | |
63 | This function is a cancellation point and therefore not marked with |
64 | __THROW. */ |
65 | extern int ppoll (struct pollfd *__fds, nfds_t __nfds, |
66 | const struct timespec *__timeout, |
67 | const __sigset_t *__ss); |
68 | #endif |
69 | |
70 | __END_DECLS |
71 | |
72 | |
73 | /* Define some inlines helping to catch common problems. */ |
74 | #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function |
75 | # include <bits/poll2.h> |
76 | #endif |
77 | |
78 | #endif /* sys/poll.h */ |
79 | |