include/linux/eventfd.h

   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 #ifdef CONFIG_EVENTFD
  12
  13 /* For O_CLOEXEC and O_NONBLOCK */
  14 #include <linux/fcntl.h>
  15
  16 /* Flags for eventfd2.  */
  17 #define EFD_CLOEXEC O_CLOEXEC
  18 #define EFD_NONBLOCK O_NONBLOCK
  19
  20 struct file *eventfd_fget(int fd);
  21 int eventfd_signal(struct file *file, int n);
  22
  23 #else /* CONFIG_EVENTFD */
  24
  25 #define eventfd_fget(fd) ERR_PTR(-ENOSYS)
  26 static inline int eventfd_signal(struct file *file, int n)
  27 { return 0; }
  28
  29 #endif /* CONFIG_EVENTFD */
  30
  31 #endif /* _LINUX_EVENTFD_H */
  32