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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 
 16 /*
 17  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
 18  * new flags, since they might collide with O_* ones. We want
 19  * to re-use O_* flags that couldn't possibly have a meaning
 20  * from eventfd, in order to leave a free define-space for
 21  * shared O_* flags.
 22  */
 23 #define EFD_SEMAPHORE (1 << 0)
 24 #define EFD_CLOEXEC O_CLOEXEC
 25 #define EFD_NONBLOCK O_NONBLOCK
 26 
 27 #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
 28 #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
 29 
 30 struct eventfd_ctx;
 31 struct file;
 32 
 33 #ifdef CONFIG_EVENTFD
 34 
 35 void eventfd_ctx_put(struct eventfd_ctx *ctx);
 36 struct file *eventfd_fget(int fd);
 37 struct eventfd_ctx *eventfd_ctx_fdget(int fd);
 38 struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
 39 __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
 40 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
 41                                   __u64 *cnt);
 42 
 43 #else /* CONFIG_EVENTFD */
 44 
 45 /*
 46  * Ugly ugly ugly error layer to support modules that uses eventfd but
 47  * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
 48  */
 49 
 50 static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
 51 {
 52         return ERR_PTR(-ENOSYS);
 53 }
 54 
 55 static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
 56 {
 57         return -ENOSYS;
 58 }
 59 
 60 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
 61 {
 62 
 63 }
 64 
 65 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
 66                                                 wait_queue_entry_t *wait, __u64 *cnt)
 67 {
 68         return -ENOSYS;
 69 }
 70 
 71 #endif
 72 
 73 #endif /* _LINUX_EVENTFD_H */
 74 
 75 

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