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/ioctl.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 /* Get the platform-dependent flags. */ 34 #include <bits/epoll.h> 35 36 #ifndef __EPOLL_PACKED 37 # define __EPOLL_PACKED 38 #endif 39 40 enum EPOLL_EVENTS 41 { 42 EPOLLIN = 0x001, 43 #define EPOLLIN EPOLLIN 44 EPOLLPRI = 0x002, 45 #define EPOLLPRI EPOLLPRI 46 EPOLLOUT = 0x004, 47 #define EPOLLOUT EPOLLOUT 48 EPOLLRDNORM = 0x040, 49 #define EPOLLRDNORM EPOLLRDNORM 50 EPOLLRDBAND = 0x080, 51 #define EPOLLRDBAND EPOLLRDBAND 52 EPOLLWRNORM = 0x100, 53 #define EPOLLWRNORM EPOLLWRNORM 54 EPOLLWRBAND = 0x200, 55 #define EPOLLWRBAND EPOLLWRBAND 56 EPOLLMSG = 0x400, 57 #define EPOLLMSG EPOLLMSG 58 EPOLLERR = 0x008, 59 #define EPOLLERR EPOLLERR 60 EPOLLHUP = 0x010, 61 #define EPOLLHUP EPOLLHUP 62 EPOLLRDHUP = 0x2000, 63 #define EPOLLRDHUP EPOLLRDHUP 64 EPOLLONESHOT = 1u << 30, 65 #define EPOLLONESHOT EPOLLONESHOT 66 EPOLLET = 1u << 31 67 #define EPOLLET EPOLLET 68 }; 69 70 71 /* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */ 72 #define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface. */ 73 #define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface. */ 74 #define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure. */ 75 76 77 typedef union epoll_data 78 { 79 void *ptr; 80 int fd; 81 uint32_t u32; 82 uint64_t u64; 83 } epoll_data_t; 84 85 struct epoll_event 86 { 87 uint32_t events; /* Epoll events */ 88 epoll_data_t data; /* User data variable */ 89 } __EPOLL_PACKED; 90 91 struct epoll_params 92 { 93 uint32_t busy_poll_usecs; 94 uint16_t busy_poll_budget; 95 uint8_t prefer_busy_poll; 96 97 /* pad the struct to a multiple of 64bits */ 98 uint8_t __pad; 99 }; 100 101 #define EPOLL_IOC_TYPE 0x8A 102 #define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params) 103 #define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params) 104 105 __BEGIN_DECLS 106 107 /* Creates an epoll instance. Returns an fd for the new instance. 108 The "size" parameter is a hint specifying the number of file 109 descriptors to be associated with the new instance. The fd 110 returned by epoll_create() should be closed with close(). */ 111 extern int epoll_create (int __size) __THROW; 112 113 /* Same as epoll_create but with a FLAGS parameter. The unused SIZE 114 parameter has been dropped. */ 115 extern int epoll_create1 (int __flags) __THROW; 116 117 118 /* Manipulate an epoll instance "epfd". Returns 0 in case of success, 119 -1 in case of error ( the "errno" variable will contain the 120 specific error code ) The "op" parameter is one of the EPOLL_CTL_* 121 constants defined above. The "fd" parameter is the target of the 122 operation. The "event" parameter describes which events the caller 123 is interested in and any associated user data. */ 124 extern int epoll_ctl (int __epfd, int __op, int __fd, 125 struct epoll_event *__event) __THROW; 126 127 128 /* Wait for events on an epoll instance "epfd". Returns the number of 129 triggered events returned in "events" buffer. Or -1 in case of 130 error with the "errno" variable set to the specific error code. The 131 "events" parameter is a buffer that will contain triggered 132 events. The "maxevents" is the maximum number of events to be 133 returned ( usually size of "events" ). The "timeout" parameter 134 specifies the maximum wait time in milliseconds (-1 == infinite). 135 136 This function is a cancellation point and therefore not marked with 137 __THROW. */ 138 extern int epoll_wait (int __epfd, struct epoll_event *__events, 139 int __maxevents, int __timeout); 140 141 142 /* Same as epoll_wait, but the thread's signal mask is temporarily 143 and atomically replaced with the one provided as parameter. 144 145 This function is a cancellation point and therefore not marked with 146 __THROW. */ 147 extern int epoll_pwait (int __epfd, struct epoll_event *__events, 148 int __maxevents, int __timeout, 149 const __sigset_t *__ss); 150 151 __END_DECLS 152 153 #endif /* sys/epoll.h */ 154