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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2025, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* 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 2 of the *
* License, or (at your option) any later version. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* 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 <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include "utilities/exception.h"
#include "utilities/osutils.h"
#include <cstdio>
#include <ctime>
#include <iostream>
namespace regina {
std::tuple<unsigned long, unsigned long, unsigned long> resUsage() {
FILE* stat = fopen("/proc/self/stat", "r");
if (! stat)
throw FileError("Could not read /proc/self/stat");
std::tuple<unsigned long, unsigned long, unsigned long> ans;
int dtmp;
char stmp[256];
unsigned long lutmp;
long ldtmp;
if (fscanf(stat, "%d%255s%255s%d%d%d%d%d%lu%lu%lu%lu%lu"
"%lu%lu%ld%ld%ld%ld%ld%ld%lu%lu",
&dtmp, stmp, stmp, &dtmp, &dtmp, &dtmp, &dtmp, &dtmp,
&lutmp, &lutmp, &lutmp, &lutmp, &lutmp,
&std::get<0>(ans), &std::get<1>(ans),
&ldtmp, &ldtmp, &ldtmp, &ldtmp, &ldtmp, &ldtmp, &lutmp,
&std::get<2>(ans)) == 23) {
fclose(stat);
return ans;
} else {
fclose(stat);
throw FileError("Could not parse /proc/self/stat");
}
}
void writeResUsage(std::ostream& out) {
try {
auto [utime, stime, vsize] = resUsage();
out << "utime=" << utime << ", stime=" << stime << ", vsize=" << vsize;
} catch (const FileError& err) {
out << err.what();
}
}
} // namespace regina
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