1 /* Copyright (C) 2002-2009, 2011 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 #ifndef _SYS_EPOLL_H 20 #define _SYS_EPOLL_H 1 21 22 #include <stdint.h> 23 #include <sys/types.h> 24 25 /* Get __sigset_t. */ 26 #include <bits/sigset.h> 27 28 #ifndef __sigset_t_defined 29 # define __sigset_t_defined 30 typedef __sigset_t sigset_t; 31 #endif 32 33 34 /* Flags to be passed to epoll_create1. */ 35 enum 36 { 37 EPOLL_CLOEXEC = 02000000, 38 #define EPOLL_CLOEXEC EPOLL_CLOEXEC 39 EPOLL_NONBLOCK = 04000 40 #define EPOLL_NONBLOCK EPOLL_NONBLOCK 41 }; 42 43 44 enum EPOLL_EVENTS 45 { 46 EPOLLIN = 0x001, 47 #define EPOLLIN EPOLLIN 48 EPOLLPRI = 0x002, 49 #define EPOLLPRI EPOLLPRI 50 EPOLLOUT = 0x004, 51 #define EPOLLOUT EPOLLOUT 52 EPOLLRDNORM = 0x040, 53 #define EPOLLRDNORM EPOLLRDNORM 54 EPOLLRDBAND = 0x080, 55 #define EPOLLRDBAND EPOLLRDBAND 56 EPOLLWRNORM = 0x100, 57 #define EPOLLWRNORM EPOLLWRNORM 58 EPOLLWRBAND = 0x200, 59 #define EPOLLWRBAND EPOLLWRBAND 60 EPOLLMSG = 0x400, 61 #define EPOLLMSG EPOLLMSG 62 EPOLLERR = 0x008, 63 #define EPOLLERR EPOLLERR 64 EPOLLHUP = 0x010, 65 #define EPOLLHUP EPOLLHUP 66 EPOLLRDHUP = 0x2000, 67 #define EPOLLRDHUP EPOLLRDHUP 68 EPOLLONESHOT = 1u << 30, 69 #define EPOLLONESHOT EPOLLONESHOT 70 EPOLLET = 1u << 31 71 #define EPOLLET EPOLLET 72 }; 73 74 75 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */ 76 #define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface. */ 77 #define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface. */ 78 #define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure. */ 79 80 81 typedef union epoll_data 82 { 83 void *ptr; 84 int fd; 85 uint32_t u32; 86 uint64_t u64; 87 } epoll_data_t; 88 89 struct epoll_event 90 { 91 uint32_t events; /* Epoll events */ 92 epoll_data_t data; /* User data variable */ 93 }; 94 95 96 __BEGIN_DECLS 97 98 /* Creates an epoll instance. Returns an fd for the new instance. 99 The "size" parameter is a hint specifying the number of file 100 descriptors to be associated with the new instance. The fd 101 returned by epoll_create() should be closed with close(). */ 102 extern int epoll_create (int __size) __THROW; 103 104 /* Same as epoll_create but with an FLAGS parameter. The unused SIZE 105 parameter has been dropped. */ 106 extern int epoll_create1 (int __flags) __THROW; 107 108 109 /* Manipulate an epoll instance "epfd". Returns 0 in case of success, 110 -1 in case of error ( the "errno" variable will contain the 111 specific error code ) The "op" parameter is one of the EPOLL_CTL_* 112 constants defined above. The "fd" parameter is the target of the 113 operation. The "event" parameter describes which events the caller 114 is interested in and any associated user data. */ 115 extern int epoll_ctl (int __epfd, int __op, int __fd, 116 struct epoll_event *__event) __THROW; 117 118 119 /* Wait for events on an epoll instance "epfd". Returns the number of 120 triggered events returned in "events" buffer. Or -1 in case of 121 error with the "errno" variable set to the specific error code. The 122 "events" parameter is a buffer that will contain triggered 123 events. The "maxevents" is the maximum number of events to be 124 returned ( usually size of "events" ). The "timeout" parameter 125 specifies the maximum wait time in milliseconds (-1 == infinite). 126 127 This function is a cancellation point and therefore not marked with 128 __THROW. */ 129 extern int epoll_wait (int __epfd, struct epoll_event *__events, 130 int __maxevents, int __timeout); 131 132 133 /* Same as epoll_wait, but the thread's signal mask is temporarily 134 and atomically replaced with the one provided as parameter. 135 136 This function is a cancellation point and therefore not marked with 137 __THROW. */ 138 extern int epoll_pwait (int __epfd, struct epoll_event *__events, 139 int __maxevents, int __timeout, 140 __const __sigset_t *__ss); 141 142 __END_DECLS 143 144 #endif /* sys/epoll.h */ 145
