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TOMOYO Linux Cross Reference
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 
 15 /*
 16  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
 17  * new flags, since they might collide with O_* ones. We want
 18  * to re-use O_* flags that couldn't possibly have a meaning
 19  * from eventfd, in order to leave a free define-space for
 20  * shared O_* flags.
 21  */
 22 #define EFD_SEMAPHORE (1 << 0)
 23 #define EFD_CLOEXEC O_CLOEXEC
 24 #define EFD_NONBLOCK O_NONBLOCK
 25 
 26 #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
 27 #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
 28 
 29 struct eventfd_ctx;
 30 struct file;
 31 
 32 #ifdef CONFIG_EVENTFD
 33 
 34 void eventfd_ctx_put(struct eventfd_ctx *ctx);
 35 struct file *eventfd_fget(int fd);
 36 struct eventfd_ctx *eventfd_ctx_fdget(int fd);
 37 struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
 38 __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
 39 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
 40                                   __u64 *cnt);
 41 
 42 #else /* CONFIG_EVENTFD */
 43 
 44 /*
 45  * Ugly ugly ugly error layer to support modules that uses eventfd but
 46  * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
 47  */
 48 
 49 static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
 50 {
 51         return ERR_PTR(-ENOSYS);
 52 }
 53 
 54 static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
 55 {
 56         return -ENOSYS;
 57 }
 58 
 59 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
 60 {
 61 
 62 }
 63 
 64 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
 65                                                 wait_queue_entry_t *wait, __u64 *cnt)
 66 {
 67         return -ENOSYS;
 68 }
 69 
 70 #endif
 71 
 72 #endif /* _LINUX_EVENTFD_H */
 73 
 74 

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