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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
e1ad7468 DL |
2 | /* |
3 | * include/linux/eventfd.h | |
4 | * | |
5 | * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> | |
6 | * | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_EVENTFD_H | |
10 | #define _LINUX_EVENTFD_H | |
11 | ||
cb289d62 | 12 | #include <linux/wait.h> |
fa3fc2ad | 13 | #include <linux/err.h> |
b5e683d5 JA |
14 | #include <linux/percpu-defs.h> |
15 | #include <linux/percpu.h> | |
b542e383 | 16 | #include <linux/sched.h> |
2d8c9dcf | 17 | #include <uapi/linux/eventfd.h> |
b087498e | 18 | |
bcd0b235 | 19 | /* |
1d730c49 | 20 | * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining |
bcd0b235 DL |
21 | * new flags, since they might collide with O_* ones. We want |
22 | * to re-use O_* flags that couldn't possibly have a meaning | |
23 | * from eventfd, in order to leave a free define-space for | |
24 | * shared O_* flags. | |
25 | */ | |
bcd0b235 DL |
26 | #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) |
27 | #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) | |
28 | ||
105f2b70 | 29 | struct eventfd_ctx; |
4e10f3c9 AV |
30 | struct file; |
31 | ||
13389010 DL |
32 | #ifdef CONFIG_EVENTFD |
33 | ||
13389010 | 34 | void eventfd_ctx_put(struct eventfd_ctx *ctx); |
e1ad7468 | 35 | struct file *eventfd_fget(int fd); |
13389010 DL |
36 | struct eventfd_ctx *eventfd_ctx_fdget(int fd); |
37 | struct eventfd_ctx *eventfd_ctx_fileget(struct file *file); | |
3652117f | 38 | __u64 eventfd_signal(struct eventfd_ctx *ctx); |
38f1755a | 39 | __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask); |
ac6424b9 | 40 | int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, |
cb289d62 | 41 | __u64 *cnt); |
28f13267 | 42 | void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); |
e1ad7468 | 43 | |
b542e383 | 44 | static inline bool eventfd_signal_allowed(void) |
b5e683d5 | 45 | { |
9f0deaa1 | 46 | return !current->in_eventfd; |
b5e683d5 JA |
47 | } |
48 | ||
e1ad7468 DL |
49 | #else /* CONFIG_EVENTFD */ |
50 | ||
13389010 DL |
51 | /* |
52 | * Ugly ugly ugly error layer to support modules that uses eventfd but | |
53 | * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. | |
54 | */ | |
562787a5 | 55 | |
13389010 DL |
56 | static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) |
57 | { | |
58 | return ERR_PTR(-ENOSYS); | |
59 | } | |
60 | ||
3652117f | 61 | static inline int eventfd_signal(struct eventfd_ctx *ctx) |
13389010 DL |
62 | { |
63 | return -ENOSYS; | |
64 | } | |
65 | ||
03e02acd JA |
66 | static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, |
67 | unsigned mask) | |
68 | { | |
69 | return -ENOSYS; | |
70 | } | |
71 | ||
13389010 DL |
72 | static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) |
73 | { | |
74 | ||
75 | } | |
e1ad7468 | 76 | |
cb289d62 | 77 | static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, |
ac6424b9 | 78 | wait_queue_entry_t *wait, __u64 *cnt) |
cb289d62 DL |
79 | { |
80 | return -ENOSYS; | |
81 | } | |
82 | ||
b542e383 | 83 | static inline bool eventfd_signal_allowed(void) |
b5e683d5 | 84 | { |
b542e383 | 85 | return true; |
b5e683d5 JA |
86 | } |
87 | ||
28f13267 DW |
88 | static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt) |
89 | { | |
90 | ||
91 | } | |
92 | ||
13389010 | 93 | #endif |
e1ad7468 | 94 | |
e1ad7468 DL |
95 | #endif /* _LINUX_EVENTFD_H */ |
96 |