1 /* Copyright (C) 2002 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 26 enum EPOLL_EVENTS 27 { 28 EPOLLIN = 0x001, 29 #define EPOLLIN EPOLLIN 30 EPOLLPRI = 0x002, 31 #define EPOLLPRI EPOLLPRI 32 EPOLLOUT = 0x004, 33 #define EPOLLOUT EPOLLOUT 34 EPOLLRDNORM = 0x040, 35 #define EPOLLRDNORM EPOLLRDNORM 36 EPOLLRDBAND = 0x080, 37 #define EPOLLRDBAND EPOLLRDBAND 38 EPOLLWRNORM = 0x100, 39 #define EPOLLWRNORM EPOLLWRNORM 40 EPOLLWRBAND = 0x200, 41 #define EPOLLWRBAND EPOLLWRBAND 42 EPOLLMSG = 0x400, 43 #define EPOLLMSG EPOLLMSG 44 EPOLLERR = 0x008, 45 #define EPOLLERR EPOLLERR 46 EPOLLHUP = 0x010, 47 #define EPOLLHUP EPOLLHUP 48 EPOLLONESHOT = (1 << 30), 49 #define EPOLLONESHOT EPOLLONESHOT 50 EPOLLET = (1 << 31) 51 #define EPOLLET EPOLLET 52 53 }; 54 55 56 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */ 57 #define EPOLL_CTL_ADD 1 /* Add a file decriptor to the interface. */ 58 #define EPOLL_CTL_DEL 2 /* Remove a file decriptor from the interface. */ 59 #define EPOLL_CTL_MOD 3 /* Change file decriptor epoll_event structure. */ 60 61 62 /* 63 * On x86-64 make the 64bit structure have the same alignment as the 64 * 32bit structure. This makes 32bit emulation easier. 65 */ 66 #ifdef __x86_64__ 67 #define EPOLL_PACKED __attribute__((packed)) 68 #else 69 #define EPOLL_PACKED 70 #endif 71 72 73 typedef union epoll_data 74 { 75 void *ptr; 76 int fd; 77 uint32_t u32; 78 uint64_t u64; 79 } epoll_data_t; 80 81 struct epoll_event 82 { 83 uint32_t events; /* Epoll events */ 84 epoll_data_t data; /* User data variable */ 85 } EPOLL_PACKED; 86 87 88 __BEGIN_DECLS 89 90 /* Creates an epoll instance. Returns an fd for the new instance. 91 The "size" parameter is a hint specifying the number of file 92 descriptors to be associated with the new instance. The fd 93 returned by epoll_create() should be closed with close(). */ 94 extern int epoll_create (int __size) __THROW; 95 96 97 /* Manipulate an epoll instance "epfd". Returns 0 in case of success, 98 -1 in case of error ( the "errno" variable will contain the 99 specific error code ) The "op" parameter is one of the EPOLL_CTL_* 100 constants defined above. The "fd" parameter is the target of the 101 operation. The "event" parameter describes which events the caller 102 is interested in and any associated user data. */ 103 extern int epoll_ctl (int __epfd, int __op, int __fd, 104 struct epoll_event *__event) __THROW; 105 106 107 /* Wait for events on an epoll instance "epfd". Returns the number of 108 triggered events returned in "events" buffer. Or -1 in case of 109 error with the "errno" variable set to the specific error code. The 110 "events" parameter is a buffer that will contain triggered 111 events. The "maxevents" is the maximum number of events to be 112 returned ( usually size of "events" ). The "timeout" parameter 113 specifies the maximum wait time in milliseconds (-1 == infinite). */ 114 extern int epoll_wait (int __epfd, struct epoll_event *__events, 115 int __maxevents, int __timeout) __THROW; 116 117 __END_DECLS 118 119 #endif /* sys/epoll.h */ 120