/* clock_gettime -- Get the current time from a POSIX clockid_t. Unix version.
- Copyright (C) 1999-2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1999-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <errno.h>
-#include <stdint.h>
#include <time.h>
#include <sys/time.h>
-#include <libc-internal.h>
-#include <ldsodefs.h>
-
-
-#if HP_TIMING_AVAIL
-/* Clock frequency of the processor. We make it a 64-bit variable
- because some jokers are already playing with processors with more
- than 4GHz. */
-static hp_timing_t freq;
-
-
-/* This function is defined in the thread library. */
-extern int __pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq,
- struct timespec *tp)
- __attribute__ ((__weak__));
-
-static int
-hp_timing_gettime (clockid_t clock_id, struct timespec *tp)
-{
- hp_timing_t tsc;
-
- if (__builtin_expect (freq == 0, 0))
- {
- /* This can only happen if we haven't initialized the `freq'
- variable yet. Do this now. We don't have to protect this
- code against multiple execution since all of them should
- lead to the same result. */
- freq = __get_clockfreq ();
- if (__builtin_expect (freq == 0, 0))
- /* Something went wrong. */
- return -1;
- }
-
- if (clock_id != CLOCK_PROCESS_CPUTIME_ID
- && __pthread_clock_gettime != NULL)
- return __pthread_clock_gettime (clock_id, freq, tp);
-
- /* Get the current counter. */
- HP_TIMING_NOW (tsc);
-
- /* Compute the offset since the start time of the process. */
- tsc -= GL(dl_cpuclock_offset);
-
- /* Compute the seconds. */
- tp->tv_sec = tsc / freq;
-
- /* And the nanoseconds. This computation should be stable until
- we get machines with about 16GHz frequency. */
- tp->tv_nsec = ((tsc % freq) * UINT64_C (1000000000)) / freq;
-
- return 0;
-}
-#endif
-
-
-static inline int
-realtime_gettime (struct timespec *tp)
-{
- struct timeval tv;
- int retval = gettimeofday (&tv, NULL);
- if (retval == 0)
- /* Convert into `timespec'. */
- TIMEVAL_TO_TIMESPEC (&tv, tp);
- return retval;
-}
-
+#include <shlib-compat.h>
/* Get current value of CLOCK and store it in TP. */
int
-clock_gettime (clockid_t clock_id, struct timespec *tp)
+__clock_gettime (clockid_t clock_id, struct timespec *tp)
{
int retval = -1;
- struct timeval tv;
switch (clock_id)
{
-#ifdef SYSDEP_GETTIME
- SYSDEP_GETTIME;
-#endif
-
-#ifndef HANDLED_REALTIME
case CLOCK_REALTIME:
- retval = gettimeofday (&tv, NULL);
- if (retval == 0)
- TIMEVAL_TO_TIMESPEC (&tv, tp);
+ {
+ struct timeval tv;
+ retval = __gettimeofday (&tv, NULL);
+ if (retval == 0)
+ TIMEVAL_TO_TIMESPEC (&tv, tp);
+ }
break;
-#endif
default:
-#ifdef SYSDEP_GETTIME_CPU
- SYSDEP_GETTIME_CPU;
-#endif
-#if HP_TIMING_AVAIL
- if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
- == CLOCK_THREAD_CPUTIME_ID)
- retval = hp_timing_gettime (clock_id, tp);
- else
-#endif
- __set_errno (EINVAL);
+ __set_errno (EINVAL);
break;
-
-#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
- case CLOCK_PROCESS_CPUTIME_ID:
- retval = hp_timing_gettime (clock_id, tp);
- break;
-#endif
}
return retval;
}
-librt_hidden_def (clock_gettime)
+libc_hidden_def (__clock_gettime)
+
+versioned_symbol (libc, __clock_gettime, clock_gettime, GLIBC_2_17);
+/* clock_gettime moved to libc in version 2.17;
+ old binaries may expect the symbol version it had in librt. */
+#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
+strong_alias (__clock_gettime, __clock_gettime_2);
+compat_symbol (libc, __clock_gettime_2, clock_gettime, GLIBC_2_2);
+#endif