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sortix--sortix/libc/sys/resource/getrusage.cpp
Jonas 'Sortie' Termansen efc0eb2829 Add getrusage(3).
2013-12-17 14:30:41 +01:00

58 lines
1.7 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
sys/resource/getrusage.cpp
Get resource usage statistics.
*******************************************************************************/
#include <sys/resource.h>
#include <sys/syscall.h>
#include <errno.h>
#include <time.h>
#include <timespec.h>
static struct timeval timeval_of_timespec(struct timespec ts)
{
struct timeval tv;
tv.tv_sec = ts.tv_sec;
tv.tv_usec = ts.tv_nsec / 1000;
return tv;
}
extern "C" int getrusage(int who, struct rusage* usage)
{
struct tmns tmns;
if ( timens(&tmns) != 0 )
return -1;
if ( who == RUSAGE_SELF )
{
usage->ru_utime = timeval_of_timespec(tmns.tmns_utime);
usage->ru_stime = timeval_of_timespec(tmns.tmns_stime);
}
else if ( who == RUSAGE_CHILDREN )
{
usage->ru_utime = timeval_of_timespec(tmns.tmns_cutime);
usage->ru_stime = timeval_of_timespec(tmns.tmns_cstime);
}
else
return errno = EINVAL, -1;
return 0;
}