2 * include/linux/eventfd.h
4 * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
8 #ifndef _LINUX_EVENTFD_H
9 #define _LINUX_EVENTFD_H
11 #include <linux/fcntl.h>
12 #include <linux/file.h>
13 #include <linux/wait.h>
16 * CAREFUL: Check include/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
22 #define EFD_SEMAPHORE (1 << 0)
23 #define EFD_CLOEXEC O_CLOEXEC
24 #define EFD_NONBLOCK O_NONBLOCK
26 #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
27 #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
31 struct file
*eventfd_file_create(unsigned int count
, int flags
);
32 struct eventfd_ctx
*eventfd_ctx_get(struct eventfd_ctx
*ctx
);
33 void eventfd_ctx_put(struct eventfd_ctx
*ctx
);
34 struct file
*eventfd_fget(int fd
);
35 struct eventfd_ctx
*eventfd_ctx_fdget(int fd
);
36 struct eventfd_ctx
*eventfd_ctx_fileget(struct file
*file
);
37 int eventfd_signal(struct eventfd_ctx
*ctx
, int n
);
38 ssize_t
eventfd_ctx_read(struct eventfd_ctx
*ctx
, int no_wait
, __u64
*cnt
);
39 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx
*ctx
, wait_queue_t
*wait
,
42 #else /* CONFIG_EVENTFD */
45 * Ugly ugly ugly error layer to support modules that uses eventfd but
46 * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
48 static inline struct file
*eventfd_file_create(unsigned int count
, int flags
)
50 return ERR_PTR(-ENOSYS
);
53 static inline struct eventfd_ctx
*eventfd_ctx_fdget(int fd
)
55 return ERR_PTR(-ENOSYS
);
58 static inline int eventfd_signal(struct eventfd_ctx
*ctx
, int n
)
63 static inline void eventfd_ctx_put(struct eventfd_ctx
*ctx
)
68 static inline ssize_t
eventfd_ctx_read(struct eventfd_ctx
*ctx
, int no_wait
,
74 static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx
*ctx
,
75 wait_queue_t
*wait
, __u64
*cnt
)
82 #endif /* _LINUX_EVENTFD_H */
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