sysdeps/unix/sysv/linux/sys/eventfd.h

   1 /* Copyright (C) 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_EVENTFD_H
  20 #define _SYS_EVENTFD_H  1
  21
  22 #include <stdint.h>
  23
  24
  25 /* Type for event counter.  */
  26 typedef uint64_t eventfd_t;
  27
  28
  29 __BEGIN_DECLS
  30
  31 /* Return file descriptor for generic event channel.  Set initial
  32    value to COUNT.  */
  33 extern int eventfd (int __count, int __flags) __THROW;
  34
  35 /* Read event counter and possibly wait for events.  */
  36 extern int eventfd_read (int __fd, eventfd_t *__value);
  37
  38 /* Increment event counter.  */
  39 extern int eventfd_write (int __fd, eventfd_t value);
  40
  41 __END_DECLS
  42
  43 #endif /* sys/eventfd.h */