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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394/* SPDX-License-Identifier: GPL-2.0 *//* * include/linux/eventfd.h * * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> * */
#ifndef _LINUX_EVENTFD_H#define _LINUX_EVENTFD_H
#include <linux/wait.h>#include <linux/err.h>#include <linux/percpu-defs.h>#include <linux/percpu.h>#include <linux/sched.h>#include <uapi/linux/eventfd.h>
/* * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining * new flags, since they might collide with O_* ones. We want * to re-use O_* flags that couldn't possibly have a meaning * from eventfd, in order to leave a free define-space for * shared O_* flags. */#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
struct eventfd_ctx;struct file;
#ifdef CONFIG_EVENTFD
void eventfd_ctx_put(struct eventfd_ctx *ctx);struct file *eventfd_fget(int fd);struct eventfd_ctx *eventfd_ctx_fdget(int fd);struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask);int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, __u64 *cnt);void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt);
static inline bool eventfd_signal_allowed(void){ return !current->in_eventfd;}
#else /* CONFIG_EVENTFD */
/* * Ugly ugly ugly error layer to support modules that uses eventfd but * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. */
static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd){ return ERR_PTR(-ENOSYS);}
static inline void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask){}
static inline void eventfd_ctx_put(struct eventfd_ctx *ctx){
}
static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, __u64 *cnt){ return -ENOSYS;}
static inline bool eventfd_signal_allowed(void){ return true;}
static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt){
}
#endif
static inline void eventfd_signal(struct eventfd_ctx *ctx){ eventfd_signal_mask(ctx, 0);}
#endif /* _LINUX_EVENTFD_H */