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Diffstat (limited to 'include/uapi/linux/eventpoll.h')
| -rw-r--r-- | include/uapi/linux/eventpoll.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/include/uapi/linux/eventpoll.h b/include/uapi/linux/eventpoll.h new file mode 100644 index 000000000..e68765884 --- /dev/null +++ b/include/uapi/linux/eventpoll.h @@ -0,0 +1,100 @@ +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ +/* + * include/linux/eventpoll.h ( Efficient event polling implementation ) + * Copyright (C) 2001,...,2006 Davide Libenzi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Davide Libenzi <davidel@xmailserver.org> + * + */ + +#ifndef _UAPI_LINUX_EVENTPOLL_H +#define _UAPI_LINUX_EVENTPOLL_H + +/* For O_CLOEXEC */ +#include <linux/fcntl.h> +#include <linux/types.h> + +/* Flags for epoll_create1. */ +#define EPOLL_CLOEXEC O_CLOEXEC + +/* Valid opcodes to issue to sys_epoll_ctl() */ +#define EPOLL_CTL_ADD 1 +#define EPOLL_CTL_DEL 2 +#define EPOLL_CTL_MOD 3 + +/* Epoll event masks */ +#define EPOLLIN (__force __poll_t)0x00000001 +#define EPOLLPRI (__force __poll_t)0x00000002 +#define EPOLLOUT (__force __poll_t)0x00000004 +#define EPOLLERR (__force __poll_t)0x00000008 +#define EPOLLHUP (__force __poll_t)0x00000010 +#define EPOLLNVAL (__force __poll_t)0x00000020 +#define EPOLLRDNORM (__force __poll_t)0x00000040 +#define EPOLLRDBAND (__force __poll_t)0x00000080 +#define EPOLLWRNORM (__force __poll_t)0x00000100 +#define EPOLLWRBAND (__force __poll_t)0x00000200 +#define EPOLLMSG (__force __poll_t)0x00000400 +#define EPOLLRDHUP (__force __poll_t)0x00002000 + +/* + * Internal flag - wakeup generated by io_uring, used to detect recursion back + * into the io_uring poll handler. + */ +#define EPOLL_URING_WAKE ((__force __poll_t)(1U << 27)) + +/* Set exclusive wakeup mode for the target file descriptor */ +#define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28)) + +/* + * Request the handling of system wakeup events so as to prevent system suspends + * from happening while those events are being processed. + * + * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be + * re-allowed until epoll_wait is called again after consuming the wakeup + * event(s). + * + * Requires CAP_BLOCK_SUSPEND + */ +#define EPOLLWAKEUP ((__force __poll_t)(1U << 29)) + +/* Set the One Shot behaviour for the target file descriptor */ +#define EPOLLONESHOT ((__force __poll_t)(1U << 30)) + +/* Set the Edge Triggered behaviour for the target file descriptor */ +#define EPOLLET ((__force __poll_t)(1U << 31)) + +/* + * On x86-64 make the 64bit structure have the same alignment as the + * 32bit structure. This makes 32bit emulation easier. + * + * UML/x86_64 needs the same packing as x86_64 + */ +#ifdef __x86_64__ +#define EPOLL_PACKED __attribute__((packed)) +#else +#define EPOLL_PACKED +#endif + +struct epoll_event { + __poll_t events; + __u64 data; +} EPOLL_PACKED; + +#ifdef CONFIG_PM_SLEEP +static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) +{ + if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) + epev->events &= ~EPOLLWAKEUP; +} +#else +static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) +{ + epev->events &= ~EPOLLWAKEUP; +} +#endif +#endif /* _UAPI_LINUX_EVENTPOLL_H */ |