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1 /* Copyright (C) 2002-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
19 #define _SYS_EPOLL_H 1
22 #include <sys/types.h>
24 #include <bits/types/sigset_t.h>
26 /* Get the platform-dependent flags. */
27 #include <bits/epoll.h>
29 #ifndef __EPOLL_PACKED
30 # define __EPOLL_PACKED
37 #define EPOLLIN EPOLLIN
39 #define EPOLLPRI EPOLLPRI
41 #define EPOLLOUT EPOLLOUT
43 #define EPOLLRDNORM EPOLLRDNORM
45 #define EPOLLRDBAND EPOLLRDBAND
47 #define EPOLLWRNORM EPOLLWRNORM
49 #define EPOLLWRBAND EPOLLWRBAND
51 #define EPOLLMSG EPOLLMSG
53 #define EPOLLERR EPOLLERR
55 #define EPOLLHUP EPOLLHUP
57 #define EPOLLRDHUP EPOLLRDHUP
58 EPOLLEXCLUSIVE
= 1u << 28,
59 #define EPOLLEXCLUSIVE EPOLLEXCLUSIVE
60 EPOLLWAKEUP
= 1u << 29,
61 #define EPOLLWAKEUP EPOLLWAKEUP
62 EPOLLONESHOT
= 1u << 30,
63 #define EPOLLONESHOT EPOLLONESHOT
65 #define EPOLLET EPOLLET
69 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */
70 #define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface. */
71 #define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface. */
72 #define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure. */
75 typedef union epoll_data
85 uint32_t events
; /* Epoll events */
86 epoll_data_t data
; /* User data variable */
92 /* Creates an epoll instance. Returns an fd for the new instance.
93 The "size" parameter is a hint specifying the number of file
94 descriptors to be associated with the new instance. The fd
95 returned by epoll_create() should be closed with close(). */
96 extern int epoll_create (int __size
) __THROW
;
98 /* Same as epoll_create but with an FLAGS parameter. The unused SIZE
99 parameter has been dropped. */
100 extern int epoll_create1 (int __flags
) __THROW
;
103 /* Manipulate an epoll instance "epfd". Returns 0 in case of success,
104 -1 in case of error ( the "errno" variable will contain the
105 specific error code ) The "op" parameter is one of the EPOLL_CTL_*
106 constants defined above. The "fd" parameter is the target of the
107 operation. The "event" parameter describes which events the caller
108 is interested in and any associated user data. */
109 extern int epoll_ctl (int __epfd
, int __op
, int __fd
,
110 struct epoll_event
*__event
) __THROW
;
113 /* Wait for events on an epoll instance "epfd". Returns the number of
114 triggered events returned in "events" buffer. Or -1 in case of
115 error with the "errno" variable set to the specific error code. The
116 "events" parameter is a buffer that will contain triggered
117 events. The "maxevents" is the maximum number of events to be
118 returned ( usually size of "events" ). The "timeout" parameter
119 specifies the maximum wait time in milliseconds (-1 == infinite).
121 This function is a cancellation point and therefore not marked with
123 extern int epoll_wait (int __epfd
, struct epoll_event
*__events
,
124 int __maxevents
, int __timeout
);
127 /* Same as epoll_wait, but the thread's signal mask is temporarily
128 and atomically replaced with the one provided as parameter.
130 This function is a cancellation point and therefore not marked with
132 extern int epoll_pwait (int __epfd
, struct epoll_event
*__events
,
133 int __maxevents
, int __timeout
,
134 const __sigset_t
*__ss
);
138 #endif /* sys/epoll.h */