From a4eba7639e29c0dae1a97d56bb3628686dc9bcac Mon Sep 17 00:00:00 2001
From: Morritz <tomeks33@gmail.com>
Date: Fri, 30 Apr 2021 15:23:31 +0200
Subject: Fix: GetPhysicalRamUsage on FreeBSD (UNIX) - webadmin display (#5213)

* Fix: GetPhysicalRamUsage on FreeBSD (UNIX) - webadmin display

* fixed cast type

* Fix: GetPhysicalRamUsage on FreeBSD - webadmin display / style and failing build fixes

* added myself to contributors

Co-authored-by: 12xx12 <44411062+12xx12@users.noreply.github.com>
---
 CMake/AddDependencies.cmake |  3 +++
 CONTRIBUTORS                |  1 +
 src/Root.cpp                | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/CMake/AddDependencies.cmake b/CMake/AddDependencies.cmake
index 584fcb011..9655d217b 100644
--- a/CMake/AddDependencies.cmake
+++ b/CMake/AddDependencies.cmake
@@ -85,4 +85,7 @@ function(link_dependencies TARGET)
 
 	# Prettify jsoncpp_static name in VS solution explorer:
 	set_property(TARGET jsoncpp_static PROPERTY PROJECT_LABEL "jsoncpp")
+	if(${CMAKE_SYSTEM_NAME} MATCHES FreeBSD)
+		target_link_libraries(${TARGET} PRIVATE kvm)
+	endif()
 endfunction()
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 175218c50..e8c1bbb47 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -49,6 +49,7 @@ mBornand
 MeMuXin
 mgueydan
 MikeHunsinger
+Morritz (TJ)
 morsmordere (Anzhelika Iugai)
 mtilden
 nesco
diff --git a/src/Root.cpp b/src/Root.cpp
index 62d50c28c..f100a242a 100644
--- a/src/Root.cpp
+++ b/src/Root.cpp
@@ -20,6 +20,11 @@
 		#endif
 	#elif defined(__APPLE__)
 		#include <mach/mach.h>
+	#elif defined(__FreeBSD__)
+		#include <kvm.h>
+		#include <fcntl.h>
+		#include <sys/sysctl.h>
+		#include <sys/user.h>
 	#endif
 #endif
 
@@ -885,6 +890,37 @@ int cRoot::GetPhysicalRAMUsage(void)
 			return static_cast<int>(t_info.resident_size / 1024);
 		}
 		return -1;
+	#elif defined (__FreeBSD__)
+		/*
+		struct rusage self_usage;
+		int status = getrusage(RUSAGE_SELF, &self_usage);
+		if (!status)
+		{
+			return static_cast<int>(self_usage.ru_maxrss);
+		}
+		return -1;
+		*/
+		// Good to watch: https://www.youtube.com/watch?v=Os5cK0H8EOA - getrusage.
+		// Unfortunately, it only gives peak memory usage a.k.a max resident set size
+		// So it is better to use FreeBSD kvm function to get the size of resident pages.
+
+		static kvm_t* kd = NULL;
+
+		if (kd == NULL)
+		{
+			kd = kvm_open(NULL, "/dev/null", NULL, O_RDONLY, "kvm_open");  // returns a descriptor used to access kernel virtual memory
+		}
+		if (kd != NULL)
+		{
+			int pc = 0;  // number of processes found
+			struct kinfo_proc* kp;
+			kp = kvm_getprocs(kd, KERN_PROC_PID, getpid(), &pc);
+			if ((kp != NULL) && (pc >= 1))
+			{
+				return static_cast<int>(kp->ki_rssize * getpagesize() / 1024);
+			}
+		}
+		return -1;
 	#else
 		LOGINFO("%s: Unknown platform, cannot query memory usage", __FUNCTION__);
 		return -1;
-- 
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