From 0c39f603441c542d0c7ba57d8e8a9aa4028286ce Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 12 Aug 2025 21:22:19 -0400
Subject: usr: kstat: Add support for '/ctl/vm/stat'

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 usr.bin/kstat/kstat.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'usr.bin/kstat')

diff --git a/usr.bin/kstat/kstat.c b/usr.bin/kstat/kstat.c
index e3b7e6a..2b0c52f 100644
--- a/usr.bin/kstat/kstat.c
+++ b/usr.bin/kstat/kstat.c
@@ -28,10 +28,34 @@
  */
 
 #include <sys/sched.h>
+#include <sys/vmstat.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
 
+static void
+get_vm_stat(void)
+{
+    struct vm_stat vmstat;
+    int retval, fd;
+
+    fd = open("/ctl/vm/stat", O_RDONLY);
+    if (fd < 0) {
+        printf("failed to open '/ctl/vm/stat'\n");
+        return;
+    }
+
+    retval = read(fd, &vmstat, sizeof(vmstat));
+    if (retval <= 0) {
+        printf("failed to read vmstat\n");
+        return;
+    }
+
+    close(fd);
+    printf("memory available: %d MiB\n", vmstat.mem_avail);
+    printf("memory used: %d MiB\n", vmstat.mem_used);
+}
+
 static void
 get_sched_stat(void)
 {
@@ -76,5 +100,6 @@ int
 main(void)
 {
     get_sched_stat();
+    get_vm_stat();
     return 0;
 }
-- 
cgit v1.2.3