projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e1ad7468 DL |
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 | ||
| e1ad7468 DL |
11 | #ifdef CONFIG_EVENTFD |
| 12 | ||
| e7d476df | 13 | /* For O_CLOEXEC and O_NONBLOCK */ |
| b087498e UD |
14 | #include <linux/fcntl.h> |
| 15 | ||
| bcd0b235 DL |
16 | /* |
| 17 | * CAREFUL: Check include/asm-generic/fcntl.h when defining | |
| 18 | * new flags, since they might collide with O_* ones. We want | |
| 19 | * to re-use O_* flags that couldn't possibly have a meaning | |
| 20 | * from eventfd, in order to leave a free define-space for | |
| 21 | * shared O_* flags. | |
| 22 | */ | |
| 23 | #define EFD_SEMAPHORE (1 << 0) | |
| b087498e | 24 | #define EFD_CLOEXEC O_CLOEXEC |
| e7d476df | 25 | #define EFD_NONBLOCK O_NONBLOCK |
| b087498e | 26 | |
| bcd0b235 DL |
27 | #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) |
| 28 | #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) | |
| 29 | ||
| e1ad7468 DL |
30 | struct file *eventfd_fget(int fd); |
| 31 | int eventfd_signal(struct file *file, int n); | |
| 32 | ||
| 33 | #else /* CONFIG_EVENTFD */ | |
| 34 | ||
| 35 | #define eventfd_fget(fd) ERR_PTR(-ENOSYS) | |
| d2fd8996 RD |
36 | static inline int eventfd_signal(struct file *file, int n) |
| 37 | { return 0; } | |
| e1ad7468 DL |
38 | |
| 39 | #endif /* CONFIG_EVENTFD */ | |
| 40 | ||
| e1ad7468 DL |
41 | #endif /* _LINUX_EVENTFD_H */ |
| 42 |