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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 2007 Denys Vlasenko
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#if ENABLE_MONOTONIC_SYSCALL
#include <sys/syscall.h>
/* Old glibc (< 2.3.4) does not provide this constant. We use syscall
* directly so this definition is safe. */
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC 1
#endif
/* libc has incredibly messy way of doing this,
* typically requiring -lrt. We just skip all this mess */
static void get_mono(struct timespec *ts)
{
if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
}
unsigned long long FAST_FUNC monotonic_ns(void)
{
struct timespec ts;
get_mono(&ts);
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
}
unsigned long long FAST_FUNC monotonic_us(void)
{
struct timespec ts;
get_mono(&ts);
return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
}
unsigned FAST_FUNC monotonic_sec(void)
{
struct timespec ts;
get_mono(&ts);
return ts.tv_sec;
}
#else
unsigned long long FAST_FUNC monotonic_ns(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
}
unsigned long long FAST_FUNC monotonic_us(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000ULL + tv.tv_usec;
}
unsigned FAST_FUNC monotonic_sec(void)
{
return time(NULL);
}
#endif
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