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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/file.h> |
13 | #include <linux/wait.h> |
14 | |
15 | /* |
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 |
20 | * shared O_* flags. |
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 | |
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, |
40 | __u64 *cnt); |
41 | |
42 | #else /* CONFIG_EVENTFD */ |
43 | |
44 | /* |
45 | * Ugly ugly ugly error layer to support modules that uses eventfd but |
46 | * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. |
47 | */ |
48 | static inline struct file *eventfd_file_create(unsigned int count, int flags) |
49 | { |
50 | return ERR_PTR(-ENOSYS); |
51 | } |
52 | |
53 | static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) |
54 | { |
55 | return ERR_PTR(-ENOSYS); |
56 | } |
57 | |
58 | static inline int eventfd_signal(struct eventfd_ctx *ctx, int n) |
59 | { |
60 | return -ENOSYS; |
61 | } |
62 | |
63 | static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) |
64 | { |
65 | |
66 | } |
67 | |
68 | static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, |
69 | __u64 *cnt) |
70 | { |
71 | return -ENOSYS; |
72 | } |
73 | |
74 | static 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 /* _LINUX_EVENTFD_H */ |
83 | |
84 |
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