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Linux/include/linux/eventfd.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  include/linux/eventfd.h
  4  *
  5  *  Copyright (C) 2007  Davide Libenzi <davidel@xmailserver.org>
  6  *
  7  */
  8 
  9 #ifndef _LINUX_EVENTFD_H
 10 #define _LINUX_EVENTFD_H
 11 
 12 #include <linux/fcntl.h>
 13 #include <linux/wait.h>
 14 #include <linux/err.h>
 15 #include <linux/percpu-defs.h>
 16 #include <linux/percpu.h>
 17 
 18 /*
 19  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
 20  * new flags, since they might collide with O_* ones. We want
 21  * to re-use O_* flags that couldn't possibly have a meaning
 22  * from eventfd, in order to leave a free define-space for
 23  * shared O_* flags.
 24  */
 25 #define EFD_SEMAPHORE (1 << 0)
 26 #define EFD_CLOEXEC O_CLOEXEC
 27 #define EFD_NONBLOCK O_NONBLOCK
 28 
 29 #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
 30 #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
 31 
 32 struct eventfd_ctx;
 33 struct file;
 34 
 35 #ifdef CONFIG_EVENTFD
 36 
 37 void eventfd_ctx_put(struct eventfd_ctx *ctx);
 38 struct file *eventfd_fget(int fd);
 39 struct eventfd_ctx *eventfd_ctx_fdget(int fd);
 40 struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
 41 __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
 42 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
 43                                   __u64 *cnt);
 44 
 45 DECLARE_PER_CPU(int, eventfd_wake_count);
 46 
 47 static inline bool eventfd_signal_count(void)
 48 {
 49         return this_cpu_read(eventfd_wake_count);
 50 }
 51 
 52 #else /* CONFIG_EVENTFD */
 53 
 54 /*
 55  * Ugly ugly ugly error layer to support modules that uses eventfd but
 56  * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
 57  */
 58 
 59 static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
 60 {
 61         return ERR_PTR(-ENOSYS);
 62 }
 63 
 64 static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
 65 {
 66         return -ENOSYS;
 67 }
 68 
 69 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
 70 {
 71 
 72 }
 73 
 74 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
 75                                                 wait_queue_entry_t *wait, __u64 *cnt)
 76 {
 77         return -ENOSYS;
 78 }
 79 
 80 static inline bool eventfd_signal_count(void)
 81 {
 82         return false;
 83 }
 84 
 85 #endif
 86 
 87 #endif /* _LINUX_EVENTFD_H */
 88 
 89 

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