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sortix--sortix/utils/uptime.cpp

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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
uptime.cpp
Tell how long the system has been running.
*******************************************************************************/
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#include <errno.h>
#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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{
return (usecs / (1000ULL * 1000ULL)) % (60ULL);
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}
size_t Minutes(uintmax_t usecs)
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{
return (usecs / (1000ULL * 1000ULL * 60ULL)) % (60ULL);
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}
size_t Hours(uintmax_t usecs)
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{
return (usecs / (1000ULL * 1000ULL * 60ULL * 60ULL)) % (24ULL);
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}
size_t Days(uintmax_t usecs)
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{
return usecs / (1000ULL * 1000ULL * 60ULL * 60ULL * 24ULL);
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}
void PrintElement(size_t num, const char* single, const char* multiple)
{
static const char* prefix = "";
if ( !num ) { return; }
const char* str = (num>1) ? multiple : single;
printf("%s%zu %s", prefix, num, str);
prefix = ", ";
}
int main(int /*argc*/, char* /*argv*/[])
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{
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struct timespec uptime;
if ( clock_gettime(CLOCK_BOOT, &uptime) < 0 )
error(1, errno, "clock_gettime(CLOCK_BOOT)");
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uintmax_t usecssinceboot = uptime.tv_sec * 1000000ULL +
uptime.tv_nsec / 1000ULL;
PrintElement(Days(usecssinceboot), "day", "days");
PrintElement(Hours(usecssinceboot), "hour", "hours");
PrintElement(Minutes(usecssinceboot), "min", "mins");
PrintElement(Seconds(usecssinceboot), "sec", "secs");
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printf("\n");
return 0;
}