mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 03:01:05 +00:00
4eb375fea3
Build fix for systems which might lack POSIX timer support.
202 lines
5.8 KiB
C
202 lines
5.8 KiB
C
/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
|
|
Copyright (C) 2003,2004,2005,2006,2007 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
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
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. */
|
|
|
|
#include <sysdep.h>
|
|
#include <errno.h>
|
|
#include <time.h>
|
|
#include "kernel-posix-cpu-timers.h"
|
|
#include <kernel-features.h>
|
|
|
|
#ifndef HAVE_CLOCK_GETTIME_VSYSCALL
|
|
# undef INTERNAL_VSYSCALL
|
|
# define INTERNAL_VSYSCALL INTERNAL_SYSCALL
|
|
# undef INLINE_VSYSCALL
|
|
# define INLINE_VSYSCALL INLINE_SYSCALL
|
|
#else
|
|
# include <bits/libc-vdso.h>
|
|
#endif
|
|
|
|
#define SYSCALL_GETTIME \
|
|
retval = INLINE_VSYSCALL (clock_gettime, 2, clock_id, tp); \
|
|
break
|
|
|
|
#ifdef __ASSUME_POSIX_TIMERS
|
|
|
|
/* This means the REALTIME and MONOTONIC clock are definitely
|
|
supported in the kernel. */
|
|
# define SYSDEP_GETTIME \
|
|
SYSDEP_GETTIME_CPUTIME \
|
|
case CLOCK_REALTIME: \
|
|
case CLOCK_MONOTONIC: \
|
|
SYSCALL_GETTIME
|
|
|
|
# define __libc_missing_posix_timers 0
|
|
#elif defined __NR_clock_gettime
|
|
/* Is the syscall known to exist? */
|
|
int __libc_missing_posix_timers attribute_hidden;
|
|
|
|
static inline int
|
|
maybe_syscall_gettime (clockid_t clock_id, struct timespec *tp)
|
|
{
|
|
int e = EINVAL;
|
|
|
|
if (!__libc_missing_posix_timers)
|
|
{
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
int r = INTERNAL_VSYSCALL (clock_gettime, err, 2, clock_id, tp);
|
|
if (!INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
return 0;
|
|
|
|
e = INTERNAL_SYSCALL_ERRNO (r, err);
|
|
if (e == ENOSYS)
|
|
{
|
|
__libc_missing_posix_timers = 1;
|
|
e = EINVAL;
|
|
}
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
/* The REALTIME and MONOTONIC clock might be available. Try the
|
|
syscall first. */
|
|
# define SYSDEP_GETTIME \
|
|
SYSDEP_GETTIME_CPUTIME \
|
|
case CLOCK_REALTIME: \
|
|
case CLOCK_MONOTONIC: \
|
|
retval = maybe_syscall_gettime (clock_id, tp); \
|
|
if (retval == 0) \
|
|
break; \
|
|
/* Fallback code. */ \
|
|
if (retval == EINVAL && clock_id == CLOCK_REALTIME) \
|
|
retval = realtime_gettime (tp); \
|
|
else \
|
|
{ \
|
|
__set_errno (retval); \
|
|
retval = -1; \
|
|
} \
|
|
break;
|
|
#endif
|
|
|
|
#ifdef __NR_clock_gettime
|
|
/* We handled the REALTIME clock here. */
|
|
# define HANDLED_REALTIME 1
|
|
# define HANDLED_CPUTIME 1
|
|
|
|
# if __ASSUME_POSIX_CPU_TIMERS > 0
|
|
|
|
# define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
|
|
# define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */
|
|
|
|
# else
|
|
|
|
int __libc_missing_posix_cpu_timers attribute_hidden;
|
|
|
|
static int
|
|
maybe_syscall_gettime_cpu (clockid_t clock_id, struct timespec *tp)
|
|
{
|
|
int e = EINVAL;
|
|
|
|
if (!__libc_missing_posix_cpu_timers)
|
|
{
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
int r = INTERNAL_VSYSCALL (clock_gettime, err, 2, clock_id, tp);
|
|
if (!INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
return 0;
|
|
|
|
e = INTERNAL_SYSCALL_ERRNO (r, err);
|
|
# ifndef __ASSUME_POSIX_TIMERS
|
|
if (e == ENOSYS)
|
|
{
|
|
__libc_missing_posix_timers = 1;
|
|
__libc_missing_posix_cpu_timers = 1;
|
|
e = EINVAL;
|
|
}
|
|
else
|
|
# endif
|
|
{
|
|
if (e == EINVAL)
|
|
{
|
|
# ifdef HAVE_CLOCK_GETRES_VSYSCALL
|
|
/* Check whether the kernel supports CPU clocks at all.
|
|
If not, record it for the future. */
|
|
r = INTERNAL_VSYSCALL (clock_getres, err, 2,
|
|
MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
|
|
NULL);
|
|
# else
|
|
/* Check whether the kernel supports CPU clocks at all.
|
|
If not, record it for the future. */
|
|
r = INTERNAL_SYSCALL (clock_getres, err, 2,
|
|
MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
|
|
NULL);
|
|
# endif
|
|
if (INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
__libc_missing_posix_cpu_timers = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
# define SYSDEP_GETTIME_CPU \
|
|
retval = maybe_syscall_gettime_cpu (clock_id, tp); \
|
|
if (retval == 0) \
|
|
break; \
|
|
if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
|
|
{ \
|
|
__set_errno (retval); \
|
|
retval = -1; \
|
|
break; \
|
|
} \
|
|
retval = -1 /* Otherwise continue on to the HP_TIMING version. */;
|
|
|
|
static inline int
|
|
maybe_syscall_gettime_cputime (clockid_t clock_id, struct timespec *tp)
|
|
{
|
|
return maybe_syscall_gettime_cpu
|
|
(clock_id == CLOCK_THREAD_CPUTIME_ID
|
|
? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
|
|
: MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
|
|
tp);
|
|
}
|
|
|
|
# define SYSDEP_GETTIME_CPUTIME \
|
|
case CLOCK_PROCESS_CPUTIME_ID: \
|
|
case CLOCK_THREAD_CPUTIME_ID: \
|
|
retval = maybe_syscall_gettime_cputime (clock_id, tp); \
|
|
if (retval == 0) \
|
|
break; \
|
|
if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
|
|
{ \
|
|
__set_errno (retval); \
|
|
retval = -1; \
|
|
break; \
|
|
} \
|
|
retval = hp_timing_gettime (clock_id, tp); \
|
|
break;
|
|
# if !HP_TIMING_AVAIL
|
|
# define hp_timing_gettime(clock_id, tp) (__set_errno (EINVAL), -1)
|
|
# endif
|
|
|
|
# endif
|
|
#endif
|
|
|
|
#include <sysdeps/unix/clock_gettime.c>
|