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89 lines
2.4 KiB
89 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* include/linux/eventpoll.h ( Efficient event polling implementation ) |
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* Copyright (C) 2001,...,2006 Davide Libenzi |
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* |
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* Davide Libenzi <[email protected]> |
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*/ |
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#ifndef _LINUX_EVENTPOLL_H |
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#define _LINUX_EVENTPOLL_H |
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#include <uapi/linux/eventpoll.h> |
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#include <uapi/linux/kcmp.h> |
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/* Forward declarations to avoid compiler errors */ |
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struct file; |
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#ifdef CONFIG_EPOLL |
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#ifdef CONFIG_KCMP |
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struct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd, unsigned long toff); |
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#endif |
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/* Used to release the epoll bits inside the "struct file" */ |
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void eventpoll_release_file(struct file *file); |
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/* |
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* This is called from inside fs/file_table.c:__fput() to unlink files |
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* from the eventpoll interface. We need to have this facility to cleanup |
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* correctly files that are closed without being removed from the eventpoll |
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* interface. |
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*/ |
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static inline void eventpoll_release(struct file *file) |
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{ |
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/* |
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* Fast check to avoid the get/release of the semaphore. Since |
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* we're doing this outside the semaphore lock, it might return |
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* false negatives, but we don't care. It'll help in 99.99% of cases |
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* to avoid the semaphore lock. False positives simply cannot happen |
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* because the file in on the way to be removed and nobody ( but |
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* eventpoll ) has still a reference to this file. |
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*/ |
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if (likely(!file->f_ep)) |
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return; |
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/* |
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* The file is being closed while it is still linked to an epoll |
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* descriptor. We need to handle this by correctly unlinking it |
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* from its containers. |
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*/ |
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eventpoll_release_file(file); |
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} |
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int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds, |
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bool nonblock); |
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/* Tells if the epoll_ctl(2) operation needs an event copy from userspace */ |
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static inline int ep_op_has_event(int op) |
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{ |
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return op != EPOLL_CTL_DEL; |
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} |
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#else |
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static inline void eventpoll_release(struct file *file) {} |
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#endif |
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#if defined(CONFIG_ARM) && defined(CONFIG_OABI_COMPAT) |
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/* ARM OABI has an incompatible struct layout and needs a special handler */ |
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extern struct epoll_event __user * |
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epoll_put_uevent(__poll_t revents, __u64 data, |
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struct epoll_event __user *uevent); |
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#else |
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static inline struct epoll_event __user * |
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epoll_put_uevent(__poll_t revents, __u64 data, |
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struct epoll_event __user *uevent) |
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{ |
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if (__put_user(revents, &uevent->events) || |
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__put_user(data, &uevent->data)) |
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return NULL; |
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return uevent+1; |
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} |
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#endif |
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#endif /* #ifndef _LINUX_EVENTPOLL_H */
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