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glibc  2.9
eventfd.h
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00001 /* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef       _SYS_EVENTFD_H
00020 #define       _SYS_EVENTFD_H       1
00021 
00022 #include <stdint.h>
00023 
00024 
00025 /* Type for event counter.  */
00026 typedef uint64_t eventfd_t;
00027 
00028 /* Flags for signalfd.  */
00029 enum
00030   {
00031     EFD_CLOEXEC = 02000000,
00032 #define EFD_CLOEXEC EFD_CLOEXEC
00033     EFD_NONBLOCK = 0200
00034 #define EFD_NONBLOCK EFD_NONBLOCK
00035   };
00036 
00037 
00038 __BEGIN_DECLS
00039 
00040 /* Return file descriptor for generic event channel.  Set initial
00041    value to COUNT.  */
00042 extern int eventfd (int __count, int __flags) __THROW;
00043 
00044 /* Read event counter and possibly wait for events.  */
00045 extern int eventfd_read (int __fd, eventfd_t *__value);
00046 
00047 /* Increment event counter.  */
00048 extern int eventfd_write (int __fd, eventfd_t value);
00049 
00050 __END_DECLS
00051 
00052 #endif /* sys/eventfd.h */