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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109/* SPDX-License-Identifier: GPL-2.0-or-later *//* * include/linux/eventpoll.h ( Efficient event polling implementation ) * Copyright (C) 2001,...,2006 Davide Libenzi * * Davide Libenzi <davidel@xmailserver.org> */#ifndef _LINUX_EVENTPOLL_H#define _LINUX_EVENTPOLL_H
#include <uapi/linux/eventpoll.h>#include <uapi/linux/kcmp.h>
/* Forward declarations to avoid compiler errors */struct file;
#ifdef CONFIG_EPOLL
#ifdef CONFIG_KCMPstruct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd, unsigned long toff);#endif
/* Used to release the epoll bits inside the "struct file" */void eventpoll_release_file(struct file *file);
/* Copy ready events to userspace */int epoll_sendevents(struct file *file, struct epoll_event __user *events, int maxevents);
/* * This is called from inside fs/file_table.c:__fput() to unlink files * from the eventpoll interface. We need to have this facility to cleanup * correctly files that are closed without being removed from the eventpoll * interface. */static inline void eventpoll_release(struct file *file){
/* * Fast check to skip the slow path in the common case where the * file was never attached to an epoll. Safe without file->f_lock * because every f_ep writer excludes a concurrent __fput() on * @file: * - ep_insert() requires the file alive (refcount > 0); * - ep_remove() holds @file pinned via epi_fget() across the * write; * - eventpoll_release_file() runs from __fput() itself. * We are in __fput() here, so none of those can race us: a NULL * observation truly means no epoll path has work left on @file. */ if (likely(!READ_ONCE(file->f_ep))) return;
/* * The file is being closed while it is still linked to an epoll * descriptor. We need to handle this by correctly unlinking it * from its containers. */ eventpoll_release_file(file);}
struct epoll_key { struct file *file; int fd;} __packed;
int do_epoll_ctl_file(struct file *f, int op, struct epoll_key *tf, struct epoll_event *epds, bool nonblock);int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds, bool nonblock);bool is_file_epoll(struct file *f);
/* Tells if the epoll_ctl(2) operation needs an event copy from userspace */static inline int ep_op_has_event(int op){ return op != EPOLL_CTL_DEL;}
#else
static inline void eventpoll_release(struct file *file) {}
#endif
#if defined(CONFIG_ARM) && defined(CONFIG_OABI_COMPAT)/* ARM OABI has an incompatible struct layout and needs a special handler */extern struct epoll_event __user *epoll_put_uevent(__poll_t revents, __u64 data, struct epoll_event __user *uevent);#elsestatic inline struct epoll_event __user *epoll_put_uevent(__poll_t revents, __u64 data, struct epoll_event __user *uevent){ scoped_user_write_access_size(uevent, sizeof(*uevent), efault) { unsafe_put_user(revents, &uevent->events, efault); unsafe_put_user(data, &uevent->data, efault); } return uevent+1;
efault: return NULL;}#endif
#endif /* #ifndef _LINUX_EVENTPOLL_H */