/**

 * XMPP - libpurple transport

 *

 * Copyright (C) 2009, Jan Kaluza <hanzz@soc.pidgin.im>

 *

 * 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.

 *

 * 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA

 */

#include "memoryusage.h"

#include <iostream>

#include <cstring>

#include <sstream>

#include <fstream>

#include <algorithm>

#include <sys/param.h>

#ifdef BSD

#include <sys/types.h>

#include <sys/sysctl.h>

#include <sys/param.h>

#include <sys/sysctl.h>

#include <sys/user.h>

#endif

namespace Transport {

#ifndef WIN32

#ifdef BSD

void process_mem_usage(double& vm_usage, double& resident_set) {

	int mib[4];

	size_t size;

	mib[0] = CTL_KERN;

	mib[1] = KERN_PROC;

	mib[2] = KERN_PROC_PID;

	mib[3] = getpid();

	struct kinfo_proc proc;

	size = sizeof(struct kinfo_proc);

	if (sysctl((int*)mib, 4, &proc, &size, NULL, 0) == -1) {

		vm_usage = 0;

		resident_set = 0;

		return;

	}

	// sysctl stores 0 in the size if we can't find the process information.

	// Set errno to ESRCH which will be translated in NoSuchProcess later on.

	if (size == 0) {

		vm_usage = 0;

		resident_set = 0;

		return;

	}

	int pagesize,cnt;

	size = sizeof(pagesize);

	sysctlbyname("hw.pagesize", &pagesize, &size, NULL, 0);

	resident_set = (double) (proc.ki_rssize * pagesize / 1024);

	vm_usage = (double) proc.ki_size;

}

#else /* BSD */

void process_mem_usage(double& shared, double& resident_set) {

	using std::ios_base;

	using std::ifstream;

	using std::string;

	shared       = 0.0;

	resident_set = 0.0;

	// 'file' stat seems to give the most reliable results

	//

	ifstream stat_stream("/proc/self/statm",ios_base::in);

	if (!stat_stream.is_open()) {

		shared = 0;

		resident_set = 0;

		return;

	}

	// dummy vars for leading entries in stat that we don't care about

	//

	string pid, comm, state, ppid, pgrp, session, tty_nr;

	string tpgid, flags, minflt, cminflt, majflt, cmajflt;

	string utime, stime, cutime, cstime, priority, nice;

	string O, itrealvalue, starttime;

	// the two fields we want

	//

	unsigned long shared_;

	long rss;

	stat_stream >> O >> rss >> shared_; // don't care about the rest

	long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // in case x86-64 is configured to use 2MB pages

	shared     = shared_ * page_size_kb;

	resident_set = rss * page_size_kb;

}

#endif /* else BSD */

#endif /* WIN32 */

}

/**

 * libtransport -- C++ library for easy XMPP Transports development

 *

 * Copyright (C) 2011, Jan Kaluza <hanzz.k@gmail.com>

 *

 * 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.

 *

 * 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA

 */

#pragma once

#include <vector>

namespace Transport {

#ifndef WIN32

	void process_mem_usage(double& shared, double& resident_set);

#endif

}