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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 | |
14 | /* |
15 | * CAREFUL: Check include/asm-generic/fcntl.h when defining |
16 | * new flags, since they might collide with O_* ones. We want |
17 | * to re-use O_* flags that couldn't possibly have a meaning |
18 | * from eventfd, in order to leave a free define-space for |
19 | * shared O_* flags. |
20 | */ |
21 | #define EFD_SEMAPHORE (1 << 0) |
22 | #define EFD_CLOEXEC O_CLOEXEC |
23 | #define EFD_NONBLOCK O_NONBLOCK |
24 | |
25 | #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) |
26 | #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) |
27 | |
28 | #ifdef CONFIG_EVENTFD |
29 | |
30 | struct file *eventfd_file_create(unsigned int count, int flags); |
31 | struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx); |
32 | void eventfd_ctx_put(struct eventfd_ctx *ctx); |
33 | struct file *eventfd_fget(int fd); |
34 | struct eventfd_ctx *eventfd_ctx_fdget(int fd); |
35 | struct eventfd_ctx *eventfd_ctx_fileget(struct file *file); |
36 | int eventfd_signal(struct eventfd_ctx *ctx, int n); |
37 | |
38 | #else /* CONFIG_EVENTFD */ |
39 | |
40 | /* |
41 | * Ugly ugly ugly error layer to support modules that uses eventfd but |
42 | * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. |
43 | */ |
44 | static inline struct file *eventfd_file_create(unsigned int count, int flags) |
45 | { |
46 | return ERR_PTR(-ENOSYS); |
47 | } |
48 | |
49 | static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) |
50 | { |
51 | return ERR_PTR(-ENOSYS); |
52 | } |
53 | |
54 | static inline int eventfd_signal(struct eventfd_ctx *ctx, int n) |
55 | { |
56 | return -ENOSYS; |
57 | } |
58 | |
59 | static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) |
60 | { |
61 | |
62 | } |
63 | |
64 | #endif |
65 | |
66 | #endif /* _LINUX_EVENTFD_H */ |
67 | |
68 |
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