1607ca46eSDavid Howells /* 2607ca46eSDavid Howells * include/linux/eventpoll.h ( Efficient event polling implementation ) 3607ca46eSDavid Howells * Copyright (C) 2001,...,2006 Davide Libenzi 4607ca46eSDavid Howells * 5607ca46eSDavid Howells * This program is free software; you can redistribute it and/or modify 6607ca46eSDavid Howells * it under the terms of the GNU General Public License as published by 7607ca46eSDavid Howells * the Free Software Foundation; either version 2 of the License, or 8607ca46eSDavid Howells * (at your option) any later version. 9607ca46eSDavid Howells * 10607ca46eSDavid Howells * Davide Libenzi <davidel@xmailserver.org> 11607ca46eSDavid Howells * 12607ca46eSDavid Howells */ 13607ca46eSDavid Howells 14607ca46eSDavid Howells #ifndef _UAPI_LINUX_EVENTPOLL_H 15607ca46eSDavid Howells #define _UAPI_LINUX_EVENTPOLL_H 16607ca46eSDavid Howells 17607ca46eSDavid Howells /* For O_CLOEXEC */ 18607ca46eSDavid Howells #include <linux/fcntl.h> 19607ca46eSDavid Howells #include <linux/types.h> 20607ca46eSDavid Howells 21607ca46eSDavid Howells /* Flags for epoll_create1. */ 22607ca46eSDavid Howells #define EPOLL_CLOEXEC O_CLOEXEC 23607ca46eSDavid Howells 24607ca46eSDavid Howells /* Valid opcodes to issue to sys_epoll_ctl() */ 25607ca46eSDavid Howells #define EPOLL_CTL_ADD 1 26607ca46eSDavid Howells #define EPOLL_CTL_DEL 2 27607ca46eSDavid Howells #define EPOLL_CTL_MOD 3 28607ca46eSDavid Howells 29*7e040726SGreg KH /* Epoll event masks */ 30*7e040726SGreg KH #define EPOLLIN 0x00000001 31*7e040726SGreg KH #define EPOLLPRI 0x00000002 32*7e040726SGreg KH #define EPOLLOUT 0x00000004 33*7e040726SGreg KH #define EPOLLERR 0x00000008 34*7e040726SGreg KH #define EPOLLHUP 0x00000010 35*7e040726SGreg KH #define EPOLLRDNORM 0x00000040 36*7e040726SGreg KH #define EPOLLRDBAND 0x00000080 37*7e040726SGreg KH #define EPOLLWRNORM 0x00000100 38*7e040726SGreg KH #define EPOLLWRBAND 0x00000200 39*7e040726SGreg KH #define EPOLLMSG 0x00000400 40*7e040726SGreg KH #define EPOLLRDHUP 0x00002000 41*7e040726SGreg KH 42df0108c5SJason Baron /* Set exclusive wakeup mode for the target file descriptor */ 436f051e4aSGreg KH #define EPOLLEXCLUSIVE (1U << 28) 44df0108c5SJason Baron 45607ca46eSDavid Howells /* 46607ca46eSDavid Howells * Request the handling of system wakeup events so as to prevent system suspends 47607ca46eSDavid Howells * from happening while those events are being processed. 48607ca46eSDavid Howells * 49607ca46eSDavid Howells * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be 50607ca46eSDavid Howells * re-allowed until epoll_wait is called again after consuming the wakeup 51607ca46eSDavid Howells * event(s). 52607ca46eSDavid Howells * 53607ca46eSDavid Howells * Requires CAP_BLOCK_SUSPEND 54607ca46eSDavid Howells */ 556f051e4aSGreg KH #define EPOLLWAKEUP (1U << 29) 56607ca46eSDavid Howells 57607ca46eSDavid Howells /* Set the One Shot behaviour for the target file descriptor */ 586f051e4aSGreg KH #define EPOLLONESHOT (1U << 30) 59607ca46eSDavid Howells 60607ca46eSDavid Howells /* Set the Edge Triggered behaviour for the target file descriptor */ 616f051e4aSGreg KH #define EPOLLET (1U << 31) 62607ca46eSDavid Howells 63607ca46eSDavid Howells /* 64607ca46eSDavid Howells * On x86-64 make the 64bit structure have the same alignment as the 65607ca46eSDavid Howells * 32bit structure. This makes 32bit emulation easier. 66607ca46eSDavid Howells * 67607ca46eSDavid Howells * UML/x86_64 needs the same packing as x86_64 68607ca46eSDavid Howells */ 69607ca46eSDavid Howells #ifdef __x86_64__ 70607ca46eSDavid Howells #define EPOLL_PACKED __attribute__((packed)) 71607ca46eSDavid Howells #else 72607ca46eSDavid Howells #define EPOLL_PACKED 73607ca46eSDavid Howells #endif 74607ca46eSDavid Howells 75607ca46eSDavid Howells struct epoll_event { 76607ca46eSDavid Howells __u32 events; 77607ca46eSDavid Howells __u64 data; 78607ca46eSDavid Howells } EPOLL_PACKED; 79607ca46eSDavid Howells 8095f19f65SAmit Pundir #ifdef CONFIG_PM_SLEEP 8195f19f65SAmit Pundir static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 8295f19f65SAmit Pundir { 8395f19f65SAmit Pundir if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) 8495f19f65SAmit Pundir epev->events &= ~EPOLLWAKEUP; 8595f19f65SAmit Pundir } 8695f19f65SAmit Pundir #else 8795f19f65SAmit Pundir static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 8895f19f65SAmit Pundir { 8995f19f65SAmit Pundir epev->events &= ~EPOLLWAKEUP; 9095f19f65SAmit Pundir } 9195f19f65SAmit Pundir #endif 92607ca46eSDavid Howells #endif /* _UAPI_LINUX_EVENTPOLL_H */ 93