The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/timerfd.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/timerfd.h

     1	/* Copyright (C) 2008-2024 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, see
    16	   <https://www.gnu.org/licenses/>.  */
    17	
    18	#ifndef	_SYS_TIMERFD_H
    19	#define	_SYS_TIMERFD_H	1
    20	
    21	#include <time.h>
    22	#include <bits/types/struct_itimerspec.h>
    23	
    24	/* Get the platform-dependent flags.  */
    25	#include <bits/timerfd.h>
    26	
    27	
    28	/* Bits to be set in the FLAGS parameter of `timerfd_settime'.  */
    29	enum
    30	  {
    31	    TFD_TIMER_ABSTIME = 1 << 0,
    32	#define TFD_TIMER_ABSTIME TFD_TIMER_ABSTIME
    33	    TFD_TIMER_CANCEL_ON_SET = 1 << 1
    34	#define TFD_TIMER_CANCEL_ON_SET TFD_TIMER_CANCEL_ON_SET
    35	  };
    36	
    37	
    38	__BEGIN_DECLS
    39	
    40	/* Return file descriptor for new interval timer source.  */
    41	extern int timerfd_create (__clockid_t __clock_id, int __flags) __THROW;
    42	
    43	/* Set next expiration time of interval timer source UFD to UTMR.  If
    44	   FLAGS has the TFD_TIMER_ABSTIME flag set the timeout value is
    45	   absolute.  Optionally return the old expiration time in OTMR.  */
    46	extern int timerfd_settime (int __ufd, int __flags,
    47				    const struct itimerspec *__utmr,
    48				    struct itimerspec *__otmr) __THROW;
    49	
    50	#ifdef __USE_TIME_BITS64
    51	# if defined(__REDIRECT_NTH)
    52	extern int __REDIRECT_NTH (timerfd_settime,
    53	                           (int __ufd, int __flags,
    54	                            const struct itimerspec *__restrict __value,
    55	                            struct itimerspec *__restrict __ovalue),
    56	                           __timerfd_settime64);
    57	# else
    58	# define timerfd_settime __timerfd_settime64
    59	# endif
    60	#endif
    61	
    62	/* Return the next expiration time of UFD.  */
    63	extern int timerfd_gettime (int __ufd, struct itimerspec *__otmr) __THROW;
    64	
    65	#ifdef __USE_TIME_BITS64
    66	# if defined(__REDIRECT_NTH)
    67	extern int __REDIRECT_NTH (timerfd_gettime, (int __ufd,
    68	                                             struct itimerspec *__otmr),
    69	                           __timerfd_gettime64);
    70	# else
    71	# define timerfd_gettime __timerfd_gettime64
    72	# endif
    73	#endif
    74	
    75	__END_DECLS
    76	
    77	#endif /* sys/timerfd.h */