1/* vi: set sw=4 ts=4: */ 2/* 3 * Utility routines. 4 * 5 * Copyright (C) 2007 Denis Vlasenko 6 * 7 * Licensed under GPL version 2, see file LICENSE in this tarball for details. 8 */ 9 10#include "libbb.h" 11 12#if ENABLE_MONOTONIC_SYSCALL 13#include <sys/syscall.h> 14 15/* libc has incredibly messy way of doing this, 16 * typically requiring -lrt. We just skip all this mess */ 17unsigned long long monotonic_us(void) 18{ 19 struct timespec ts; 20 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts)) 21 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed"); 22 return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000; 23} 24unsigned monotonic_sec(void) 25{ 26 struct timespec ts; 27 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts)) 28 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed"); 29 return ts.tv_sec; 30} 31#else 32unsigned long long monotonic_us(void) 33{ 34 struct timeval tv; 35 gettimeofday(&tv, NULL); 36 return tv.tv_sec * 1000000ULL + tv.tv_usec; 37} 38 39unsigned monotonic_sec(void) 40{ 41 return time(NULL); 42} 43#endif 44