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Linux/include/linux/eventfd.h

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  1 /*
  2  *  include/linux/eventfd.h
  3  *
  4  *  Copyright (C) 2007  Davide Libenzi <davidel@xmailserver.org>
  5  *
  6  */
  7 
  8 #ifndef _LINUX_EVENTFD_H
  9 #define _LINUX_EVENTFD_H
 10 
 11 #include <linux/fcntl.h>
 12 #include <linux/wait.h>
 13 
 14 /*
 15  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
 16  * new flags, since they might collide with O_* ones. We want
 17  * to re-use O_* flags that couldn't possibly have a meaning
 18  * from eventfd, in order to leave a free define-space for
 19  * shared O_* flags.
 20  */
 21 #define EFD_SEMAPHORE (1 << 0)
 22 #define EFD_CLOEXEC O_CLOEXEC
 23 #define EFD_NONBLOCK O_NONBLOCK
 24 
 25 #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
 26 #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
 27 
 28 struct file;
 29 
 30 #ifdef CONFIG_EVENTFD
 31 
 32 struct file *eventfd_file_create(unsigned int count, int flags);
 33 struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx);
 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 ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt);
 40 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_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 static inline struct file *eventfd_file_create(unsigned int count, int flags)
 50 {
 51         return ERR_PTR(-ENOSYS);
 52 }
 53 
 54 static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
 55 {
 56         return ERR_PTR(-ENOSYS);
 57 }
 58 
 59 static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
 60 {
 61         return -ENOSYS;
 62 }
 63 
 64 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
 65 {
 66 
 67 }
 68 
 69 static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait,
 70                                        __u64 *cnt)
 71 {
 72         return -ENOSYS;
 73 }
 74 
 75 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
 76                                                 wait_queue_t *wait, __u64 *cnt)
 77 {
 78         return -ENOSYS;
 79 }
 80 
 81 #endif
 82 
 83 #endif /* _LINUX_EVENTFD_H */
 84 
 85 

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