From c0168cf082c31410261a0abc5617a39f19b3c7d1 Mon Sep 17 00:00:00 2001
From: Jan Kaluza <hanzz.k@gmail.com>
Date: Mon, 18 Jul 2011 14:45:50 +0200
Subject: [PATCH] Memory stats

---
 src/memoryusage.cpp | 114 ++++++++++++++++++++++++++++++++++++++++++++
 src/memoryusage.h   |  31 ++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 src/memoryusage.cpp
 create mode 100644 src/memoryusage.h

diff --git a/src/memoryusage.cpp b/src/memoryusage.cpp
new file mode 100644
index 00000000..280768e1
--- /dev/null
+++ b/src/memoryusage.cpp
@@ -0,0 +1,114 @@
+/**
+ * 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 */
+
+}
diff --git a/src/memoryusage.h b/src/memoryusage.h
new file mode 100644
index 00000000..d2080e21
--- /dev/null
+++ b/src/memoryusage.h
@@ -0,0 +1,31 @@
+/**
+ * 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
+
+}
\ No newline at end of file