75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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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_BOOT, &uptime) < 0 )
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error(1, errno, "clock_gettime(CLOCK_BOOT)");
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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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