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8#ifndef _LINUX_EVENTFD_H
9#define _LINUX_EVENTFD_H
10
11#include <linux/fcntl.h>
12#include <linux/file.h>
13#include <linux/wait.h>
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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#ifdef CONFIG_EVENTFD
30
31struct file *eventfd_file_create(unsigned int count, int flags);
32struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx);
33void eventfd_ctx_put(struct eventfd_ctx *ctx);
34struct file *eventfd_fget(int fd);
35struct eventfd_ctx *eventfd_ctx_fdget(int fd);
36struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
37__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
38ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt);
39int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait,
40 __u64 *cnt);
41
42#else
43
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46
47
48static inline struct file *eventfd_file_create(unsigned int count, int flags)
49{
50 return ERR_PTR(-ENOSYS);
51}
52
53static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
54{
55 return ERR_PTR(-ENOSYS);
56}
57
58static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
59{
60 return -ENOSYS;
61}
62
63static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
64{
65
66}
67
68static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait,
69 __u64 *cnt)
70{
71 return -ENOSYS;
72}
73
74static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
75 wait_queue_t *wait, __u64 *cnt)
76{
77 return -ENOSYS;
78}
79
80#endif
81
82#endif
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84