72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* uptime.c
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* Tell how long the system has been running.
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*/
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <time.h>
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size_t Seconds(uintmax_t usecs)
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{
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return (usecs / (1000ULL * 1000ULL)) % (60ULL);
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}
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size_t Minutes(uintmax_t usecs)
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{
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return (usecs / (1000ULL * 1000ULL * 60ULL)) % (60ULL);
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}
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size_t Hours(uintmax_t usecs)
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{
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return (usecs / (1000ULL * 1000ULL * 60ULL * 60ULL)) % (24ULL);
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}
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size_t Days(uintmax_t usecs)
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{
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return usecs / (1000ULL * 1000ULL * 60ULL * 60ULL * 24ULL);
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}
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void PrintElement(size_t num, const char* single, const char* multiple)
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{
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static const char* prefix = "";
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if ( !num ) { return; }
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const char* str = (num>1) ? multiple : single;
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printf("%s%zu %s", prefix, num, str);
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prefix = ", ";
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}
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int main(void)
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{
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struct timespec uptime;
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if ( clock_gettime(CLOCK_BOOTTIME, &uptime) < 0 )
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error(1, errno, "clock_gettime(CLOCK_BOOTTIME)");
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uintmax_t usecssinceboot = uptime.tv_sec * 1000000ULL +
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uptime.tv_nsec / 1000ULL;
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PrintElement(Days(usecssinceboot), "day", "days");
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PrintElement(Hours(usecssinceboot), "hour", "hours");
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PrintElement(Minutes(usecssinceboot), "min", "mins");
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PrintElement(Seconds(usecssinceboot), "sec", "secs");
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printf("\n");
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return 0;
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}
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