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