From 75987c50d6db9107526fdf8321a191c9527300e0 Mon Sep 17 00:00:00 2001
From: bch <bch>
Date: Wed, 26 Dec 2018 18:46:16 +0000
Subject: [PATCH] freebsd memory usage

---
 get_mem_fbsd.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 get_mem_fbsd.c

diff --git a/get_mem_fbsd.c b/get_mem_fbsd.c
new file mode 100644
index 0000000..2ba9cc0
--- /dev/null
+++ b/get_mem_fbsd.c
@@ -0,0 +1,113 @@
+/*  $Id: get_mem_fbsd.c,v 1.1 2018/12/26 18:46:16 bch Exp $
+ * 
+ * Author: Christian Barthel <bch@online.de>
+ */
+
+
+#include <sys/types.h>	/* DEV_BSIZE MAXCOMLEN PZERO */
+#include <sys/sysctl.h>
+
+#include <unistd.h>
+#include <kvm.h>
+
+#include <X11/Xos.h>
+#include <X11/Intrinsic.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <err.h>
+#include "MemStripChart.h"
+
+static int pageshift = -1; 
+static int pagesize  = 0;
+static kvm_t *kd = 0;
+#define pagetok(size) ((size) << pageshift)
+#define LOG1024 10 
+
+static unsigned int allmem_pages = 0; 
+
+static void initPageShift(void)
+{
+	pagesize = getpagesize();
+	size_t len = sizeof(allmem_pages);
+	int mib[len];
+	pageshift = 0;
+	while (pagesize > 1) {
+		pageshift++;
+		pagesize >>= 1;
+	}
+	pageshift -= LOG1024;
+
+	kd = kvm_open(NULL, "/dev/null" ,NULL, O_RDONLY, "kvm_open");
+
+	if (sysctlbyname("vm.stats.vm.v_page_count", &allmem_pages, &len, NULL, 0) == -1)
+			perror("sysctl");
+#ifdef DEBUG
+	printf("page_count: %d\n", allmem_pages);
+#endif
+}
+
+static double getSwapFrac() 
+{
+		/* XXX Borrowed from top(1) code: */
+		int n;
+		struct kvm_swap swapary[1];
+		static int pagesize = 0;
+		static unsigned long swap_maxpages = 0;
+		size_t sz = sizeof(swap_maxpages);
+
+		int retavail = 0;
+		int retfree = 0;
+
+
+		n = kvm_getswapinfo(kd, swapary, 1, 0);
+		if (n < 0 || swapary[0].ksw_total == 0)
+				return (0);
+		
+		if (swap_maxpages == 0)
+				sysctlbyname("vm.swap_maxpages", &swap_maxpages, &sz, NULL, 0);
+
+		if ( swapary[0].ksw_total > swap_maxpages )
+				swapary[0].ksw_total = swap_maxpages;
+		
+		retavail = swapary[0].ksw_total;
+		retfree = swapary[0].ksw_total - swapary[0].ksw_used;
+
+#ifdef DEBUG
+		printf("swap: %d %d %d %d\n", retavail, retavail, swapary[0].ksw_total,
+					 swapary[0].ksw_used);
+#endif
+		return (double)(retavail-retfree)/(double)retavail;
+}
+
+void GetMemLoadPoint(Widget w, caddr_t closure, caddr_t call_data)	
+{
+	MemStripChartCallbackData ret;
+	int a, b;
+	size_t sz = sizeof(int);
+	double cache = 0;
+	
+	if (pageshift < 0) 
+		initPageShift(); 
+
+	sysctlbyname("vm.stats.vm.v_wire_count", &a, &sz, NULL, 0);
+	ret.code = (double)a / (double)allmem_pages;
+
+	sysctlbyname("vm.stats.vm.v_active_count", &a, &sz, NULL, 0);
+	ret.buffer = (double)a / (double)allmem_pages;
+	
+	/* v_cache_count and v_inactive_count are treated similarly */
+	sysctlbyname("vm.stats.vm.v_inactive_count", &a, &sz, NULL, 0);
+	sysctlbyname("vm.stats.vm.v_cache_count", &b, &sz, NULL, 0);
+	ret.cached = (double)(a + b) / allmem_pages;
+
+
+	sysctlbyname("vm.stats.vm.v_free_count", &a, &sz, NULL, 0);
+	ret.free = (double)a / allmem_pages;
+	ret.swap = getSwapFrac();
+
+#ifdef DEBUG
+	printf("%u  %lf %lf  %lf %lf\n", allmem_pages, 
+				 ret.code, ret.cached, ret.free, ret.swap);
+#endif
+	memcpy(call_data, &ret, sizeof(MemStripChartCallbackData));
+}