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linux: Add support for clock_getres64 vDSO

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No architecture currently defines the vDSO symbol.  On archictures
with 64-bit time_t the HAVE_CLOCK_GETRES_VSYSCALL is renamed to
HAVE_CLOCK_GETRES64_VSYSCALL, it simplifies clock_gettime code.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Adhemerval Zanella
2019-12-11 16:39:01 -03:00
parent cdae973b6a
commit 0dc1a378b1
8 changed files with 24 additions and 12 deletions
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17
sysdeps/unix/sysv/linux/clock_getres.c
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@ -30,20 +30,23 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res)
{
#ifdef __ASSUME_TIME64_SYSCALLS
/* 64 bit ABIs or Newer 32-bit ABIs that only support 64-bit time_t. */
# ifdef __NR_clock_getres_time64
return INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# ifndef __NR_clock_getres_time64
# define __NR_clock_getres_time64 __NR_clock_getres
# endif
# ifdef HAVE_CLOCK_GETRES64_VSYSCALL
return INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
# else
# ifdef HAVE_CLOCK_GETRES_VSYSCALL
return INLINE_VSYSCALL (clock_getres, 2, clock_id, res);
# else
return INLINE_SYSCALL_CALL (clock_getres, clock_id, res);
# endif
return INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# endif
#else
int r;
/* Old 32-bit ABI with possible 64-bit time_t support. */
# ifdef __NR_clock_getres_time64
# ifdef HAVE_CLOCK_GETRES64_VSYSCALL
r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
# else
r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# endif
if (r == 0 || errno != ENOSYS)
return r;
# endif