projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| e1ad7468 DL |
2 | /* |
| 3 | * include/linux/eventfd.h | |
| 4 | * | |
| 5 | * Copyright (C) 2007 Davide Libenzi <[email protected]> | |
| 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); | |
| b7638ad0 | 38 | void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask); |
| ac6424b9 | 39 | int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, |
| cb289d62 | 40 | __u64 *cnt); |
| 28f13267 | 41 | void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); |
| e1ad7468 | 42 | |
| b542e383 | 43 | static inline bool eventfd_signal_allowed(void) |
| b5e683d5 | 44 | { |
| 9f0deaa1 | 45 | return !current->in_eventfd; |
| b5e683d5 JA |
46 | } |
| 47 | ||
| e1ad7468 DL |
48 | #else /* CONFIG_EVENTFD */ |
| 49 | ||
| 13389010 DL |
50 | /* |
| 51 | * Ugly ugly ugly error layer to support modules that uses eventfd but | |
| 52 | * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO. | |
| 53 | */ | |
| 562787a5 | 54 | |
| 13389010 DL |
55 | static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) |
| 56 | { | |
| 57 | return ERR_PTR(-ENOSYS); | |
| 58 | } | |
| 59 | ||
| b7638ad0 | 60 | static inline void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask) |
| 13389010 | 61 | { |
| 03e02acd JA |
62 | } |
| 63 | ||
| 13389010 DL |
64 | static inline void eventfd_ctx_put(struct eventfd_ctx *ctx) |
| 65 | { | |
| 66 | ||
| 67 | } | |
| e1ad7468 | 68 | |
| cb289d62 | 69 | static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, |
| ac6424b9 | 70 | wait_queue_entry_t *wait, __u64 *cnt) |
| cb289d62 DL |
71 | { |
| 72 | return -ENOSYS; | |
| 73 | } | |
| 74 | ||
| b542e383 | 75 | static inline bool eventfd_signal_allowed(void) |
| b5e683d5 | 76 | { |
| b542e383 | 77 | return true; |
| b5e683d5 JA |
78 | } |
| 79 | ||
| 28f13267 DW |
80 | static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt) |
| 81 | { | |
| 82 | ||
| 83 | } | |
| 84 | ||
| 13389010 | 85 | #endif |
| e1ad7468 | 86 | |
| b7638ad0 CB |
87 | static inline void eventfd_signal(struct eventfd_ctx *ctx) |
| 88 | { | |
| 89 | eventfd_signal_mask(ctx, 0); | |
| 90 | } | |
| 91 | ||
| e1ad7468 DL |
92 | #endif /* _LINUX_EVENTFD_H */ |
| 93 |