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Change most internal uses of time to __clock_gettime.

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As for gettimeofday, time will be implemented based on clock_gettime
on all platforms and internal code should use clock_gettime
directly.  In addition to removing a layer of indirection, this will
allow us to remove the PLT-bypass gunk for gettimeofday.

The changed code always assumes __clock_gettime (CLOCK_REALTIME)
or __clock_gettime (CLOCK_REALTIME_COARSE) (for Linux case) cannot
fail, using the same rationale for gettimeofday change.  And internal
helper was added (time_now).

Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
powerpc64-linux-gnu, and powerpc-linux-gnu.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Adhemerval Zanella
2019-10-24 21:01:40 +00:00
parent 0d56378349
commit f9a7554009
14 changed files with 53 additions and 121 deletions
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34
sysdeps/unix/sysv/linux/x86/time.c
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@ -17,43 +17,31 @@
<https://www.gnu.org/licenses/>. */
#include <time.h>
#include <sysdep.h>
#ifdef SHARED
#include <dl-vdso.h>
#include <errno.h>
#ifdef HAVE_TIME_VSYSCALL
# define HAVE_VSYSCALL
#endif
#include <sysdep-vdso.h>
static time_t
__time_syscall (time_t *t)
time_vsyscall (time_t *t)
{
INTERNAL_SYSCALL_DECL (err);
return INTERNAL_SYSCALL (time, err, 1, t);
return INLINE_VSYSCALL (time, 1, t);
}
# ifndef time_type
/* The i386 time.c includes this file with a defined time_type macro.
For x86_64 we have to define it to time as the internal symbol is the
ifunc'ed one. */
# define time_type time
# endif
#ifdef SHARED
# include <dl-vdso.h>
# include <libc-vdso.h>
#undef INIT_ARCH
#define INIT_ARCH()
/* If the vDSO is not available we fall back on the syscall. */
libc_ifunc_hidden (time_type, time,
(get_vdso_symbol ("__vdso_time") ?: __time_syscall))
libc_hidden_def (time)
libc_ifunc (time, (get_vdso_symbol ("__vdso_time") ?: time_vsyscall))
#else
# include <sysdep.h>
time_t
time (time_t *t)
{
INTERNAL_SYSCALL_DECL (err);
return INTERNAL_SYSCALL (time, err, 1, t);
return time_vsyscall (t);
}
#endif