1 /* Copyright (C) 2002-2012 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 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. 8 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. 13 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 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_EPOLL_H 19 #define _SYS_EPOLL_H 1 20 21 #include <stdint.h> 22 #include <sys/types.h> 23 24 /* Get __sigset_t. */ 25 #include <bits/sigset.h> 26 27 #ifndef __sigset_t_defined 28 # define __sigset_t_defined 29 typedef __sigset_t sigset_t; 30 #endif 31 32 /* Get the platform-dependent flags. */ 33 #include <bits/epoll.h> 34 35 #ifndef __EPOLL_PACKED 36 # define __EPOLL_PACKED 37 #endif 38 39 enum EPOLL_EVENTS 40 { 41 EPOLLIN = 0x001, 42 #define EPOLLIN EPOLLIN 43 EPOLLPRI = 0x002, 44 #define EPOLLPRI EPOLLPRI 45 EPOLLOUT = 0x004, 46 #define EPOLLOUT EPOLLOUT 47 EPOLLRDNORM = 0x040, 48 #define EPOLLRDNORM EPOLLRDNORM 49 EPOLLRDBAND = 0x080, 50 #define EPOLLRDBAND EPOLLRDBAND 51 EPOLLWRNORM = 0x100, 52 #define EPOLLWRNORM EPOLLWRNORM 53 EPOLLWRBAND = 0x200, 54 #define EPOLLWRBAND EPOLLWRBAND 55 EPOLLMSG = 0x400, 56 #define EPOLLMSG EPOLLMSG 57 EPOLLERR = 0x008, 58 #define EPOLLERR EPOLLERR 59 EPOLLHUP = 0x010, 60 #define EPOLLHUP EPOLLHUP 61 EPOLLRDHUP = 0x2000, 62 #define EPOLLRDHUP EPOLLRDHUP 63 EPOLLONESHOT = 1u << 30, 64 #define EPOLLONESHOT EPOLLONESHOT 65 EPOLLET = 1u << 31 66 #define EPOLLET EPOLLET 67 }; 68 69 70 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */ 71 #define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface. */ 72 #define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface. */ 73 #define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure. */ 74 75 76 typedef union epoll_data 77 { 78 void *ptr; 79 int fd; 80 uint32_t u32; 81 uint64_t u64; 82 } epoll_data_t; 83 84 struct epoll_event 85 { 86 uint32_t events; /* Epoll events */ 87 epoll_data_t data; /* User data variable */ 88 } __EPOLL_PACKED; 89 90 91 __BEGIN_DECLS 92 93 /* Creates an epoll instance. Returns an fd for the new instance. 94 The "size" parameter is a hint specifying the number of file 95 descriptors to be associated with the new instance. The fd 96 returned by epoll_create() should be closed with close(). */ 97 extern int epoll_create (int __size) __THROW; 98 99 /* Same as epoll_create but with a FLAGS parameter. The unused SIZE 100 parameter has been dropped. */ 101 extern int epoll_create1 (int __flags) __THROW; 102 103 104 /* Manipulate an epoll instance "epfd". Returns 0 in case of success, 105 -1 in case of error ( the "errno" variable will contain the 106 specific error code ) The "op" parameter is one of the EPOLL_CTL_* 107 constants defined above. The "fd" parameter is the target of the 108 operation. The "event" parameter describes which events the caller 109 is interested in and any associated user data. */ 110 extern int epoll_ctl (int __epfd, int __op, int __fd, 111 struct epoll_event *__event) __THROW; 112 113 114 /* Wait for events on an epoll instance "epfd". Returns the number of 115 triggered events returned in "events" buffer. Or -1 in case of 116 error with the "errno" variable set to the specific error code. The 117 "events" parameter is a buffer that will contain triggered 118 events. The "maxevents" is the maximum number of events to be 119 returned ( usually size of "events" ). The "timeout" parameter 120 specifies the maximum wait time in milliseconds (-1 == infinite). 121 122 This function is a cancellation point and therefore not marked with 123 __THROW. */ 124 extern int epoll_wait (int __epfd, struct epoll_event *__events, 125 int __maxevents, int __timeout); 126 127 128 /* Same as epoll_wait, but the thread's signal mask is temporarily 129 and atomically replaced with the one provided as parameter. 130 131 This function is a cancellation point and therefore not marked with 132 __THROW. */ 133 extern int epoll_pwait (int __epfd, struct epoll_event *__events, 134 int __maxevents, int __timeout, 135 const __sigset_t *__ss); 136 137 __END_DECLS 138 139 #endif /* sys/epoll.h */ 140