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include/linux/eventfd.h
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/* * include/linux/eventfd.h * * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> * */ #ifndef _LINUX_EVENTFD_H #define _LINUX_EVENTFD_H |
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#include <linux/fcntl.h> |
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#include <linux/file.h> |
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#include <linux/wait.h> |
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/* * CAREFUL: Check include/asm-generic/fcntl.h when defining * new flags, since they might collide with O_* ones. We want * to re-use O_* flags that couldn't possibly have a meaning * from eventfd, in order to leave a free define-space for * shared O_* flags. */ #define EFD_SEMAPHORE (1 << 0) |
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#define EFD_CLOEXEC O_CLOEXEC |
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#define EFD_NONBLOCK O_NONBLOCK |
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#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) |
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#ifdef CONFIG_EVENTFD |
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struct file *eventfd_file_create(unsigned int count, int flags); |
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struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx); void eventfd_ctx_put(struct eventfd_ctx *ctx); |
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struct file *eventfd_fget(int fd); |
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struct eventfd_ctx *eventfd_ctx_fdget(int fd); struct eventfd_ctx *eventfd_ctx_fileget(struct file *file); int eventfd_signal(struct eventfd_ctx *ctx, int n); |
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ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt); int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait, __u64 *cnt); |
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#else /* CONFIG_EVENTFD */ |
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/* * Ugly ugly ugly error layer to support modules that uses eventfd but * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. */ |
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static inline struct file *eventfd_file_create(unsigned int count, int flags) { return ERR_PTR(-ENOSYS); } |
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static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) { return ERR_PTR(-ENOSYS); } static inline int eventfd_signal(struct eventfd_ctx *ctx, int n) { return -ENOSYS; } static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) { } |
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static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt) { return -ENOSYS; } static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait, __u64 *cnt) { return -ENOSYS; } |
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#endif |
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#endif /* _LINUX_EVENTFD_H */ |