Add DoSysctrl() to Linux's common utilities.

internal/common/common_linux.go

@@ -2,7 +2,31 @@
 
 package common
 
-import "os"
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func DoSysctrl(mib string) ([]string, error) {
+	err := os.Setenv("LC_ALL", "C")
+	if err != nil {
+		return []string{}, err
+	}
+	sysctl, err := exec.LookPath("/sbin/sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	out, err := exec.Command(sysctl, "-n", mib).Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
 
 func NumProcs() (uint64, error) {
 	f, err := os.Open(HostProc())