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94 lines
2.1 KiB
94 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/linux/eventfd.h |
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* |
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* Copyright (C) 2007 Davide Libenzi <[email protected]> |
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* |
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*/ |
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#ifndef _LINUX_EVENTFD_H |
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#define _LINUX_EVENTFD_H |
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#include <linux/fcntl.h> |
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#include <linux/wait.h> |
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#include <linux/err.h> |
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#include <linux/percpu-defs.h> |
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#include <linux/percpu.h> |
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/* |
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* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining |
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* new flags, since they might collide with O_* ones. We want |
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* to re-use O_* flags that couldn't possibly have a meaning |
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* from eventfd, in order to leave a free define-space for |
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* shared O_* flags. |
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*/ |
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#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) |
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#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) |
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struct eventfd_ctx; |
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struct file; |
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#ifdef CONFIG_EVENTFD |
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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); |
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struct eventfd_ctx *eventfd_ctx_fileget(struct file *file); |
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__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n); |
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int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, |
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__u64 *cnt); |
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void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); |
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DECLARE_PER_CPU(int, eventfd_wake_count); |
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static inline bool eventfd_signal_count(void) |
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{ |
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return this_cpu_read(eventfd_wake_count); |
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} |
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#else /* CONFIG_EVENTFD */ |
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/* |
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* Ugly ugly ugly error layer to support modules that uses eventfd but |
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* pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. |
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*/ |
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static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) |
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{ |
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return ERR_PTR(-ENOSYS); |
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} |
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static inline int eventfd_signal(struct eventfd_ctx *ctx, int n) |
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{ |
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return -ENOSYS; |
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} |
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static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) |
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{ |
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} |
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static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, |
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wait_queue_entry_t *wait, __u64 *cnt) |
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{ |
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return -ENOSYS; |
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} |
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static inline bool eventfd_signal_count(void) |
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{ |
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return false; |
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} |
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static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt) |
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{ |
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} |
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#endif |
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#endif /* _LINUX_EVENTFD_H */ |
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