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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 void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt);
 45 
 46 DECLARE_PER_CPU(int, eventfd_wake_count);
 47 
 48 static inline bool eventfd_signal_count(void)
 49 {
 50         return this_cpu_read(eventfd_wake_count);
 51 }
 52 
 53 #else /* CONFIG_EVENTFD */
 54 
 55 /*
 56  * Ugly ugly ugly error layer to support modules that uses eventfd but
 57  * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
 58  */
 59 
 60 static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
 61 {
 62         return ERR_PTR(-ENOSYS);
 63 }
 64 
 65 static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
 66 {
 67         return -ENOSYS;
 68 }
 69 
 70 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
 71 {
 72 
 73 }
 74 
 75 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
 76                                                 wait_queue_entry_t *wait, __u64 *cnt)
 77 {
 78         return -ENOSYS;
 79 }
 80 
 81 static inline bool eventfd_signal_count(void)
 82 {
 83         return false;
 84 }
 85 
 86 static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
 87 {
 88 
 89 }
 90 
 91 #endif
 92 
 93 #endif /* _LINUX_EVENTFD_H */
 94 
 95 

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