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

   1 /* Copyright (C) 2008, 2012 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_TIMERFD_H
  20 #define _SYS_TIMERFD_H  1
  21
  22 #include <time.h>
  23
  24
  25 /* Bits to be set in the FLAGS parameter of `timerfd_create'.  */
  26 enum
  27   {
  28     TFD_CLOEXEC = 02000000,
  29 #define TFD_CLOEXEC TFD_CLOEXEC
  30     TFD_NONBLOCK = 04000
  31 #define TFD_NONBLOCK TFD_NONBLOCK
  32   };
  33
  34
  35 /* Bits to be set in the FLAGS parameter of `timerfd_settime'.  */
  36 enum
  37   {
  38     TFD_TIMER_ABSTIME = 1 << 0
  39 #define TFD_TIMER_ABSTIME TFD_TIMER_ABSTIME
  40   };
  41
  42
  43 __BEGIN_DECLS
  44
  45 /* Return file descriptor for new interval timer source.  */
  46 extern int timerfd_create (clockid_t __clock_id, int __flags) __THROW;
  47
  48 /* Set next expiration time of interval timer source UFD to UTMR.  If
  49    FLAGS has the TFD_TIMER_ABSTIME flag set the timeout value is
  50    absolute.  Optionally return the old expiration time in OTMR.  */
  51 extern int timerfd_settime (int __ufd, int __flags,
  52                             const struct itimerspec *__utmr,
  53                             struct itimerspec *__otmr) __THROW;
  54
  55 /* Return the next expiration time of UFD.  */
  56 extern int timerfd_gettime (int __ufd, struct itimerspec *__otmr) __THROW;
  57
  58 __END_DECLS
  59
  60 #endif /* sys/timerfd.h */