cmd/utils: Cross platform compatible fd limit test

cmd/utils/fdlimit_freebsd.go

@@ -52,3 +52,11 @@ func getFdLimit() (int, error) {
 	}
 	return int(limit.Cur), nil
 }
+
+func getFdMaxLimit() (int, error) {
+	var limit syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+		return 0, err
+	}
+	return int(limit.Max), nil
+}

cmd/utils/fdlimit_test.go

@@ -27,10 +27,11 @@ import (
 func TestFileDescriptorLimits(t *testing.T) {
 	target := 4096
 	var limit syscall.Rlimit
-	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+	hardlimit, err := getFdMaxLimit()
+	if err != nil {
 		t.Fatal(err)
 	}
-	if int(limit.Max) < target {
+	if hardlimit < target {
 		t.Skip(fmt.Sprintf("system limit is less than desired test target: %d < %d", limit.Max, target))
 	}
 

cmd/utils/fdlimit_unix.go

@@ -48,3 +48,11 @@ func getFdLimit() (int, error) {
 	}
 	return int(limit.Cur), nil
 }
+
+func getFdMaxLimit() (int, error) {
+	var limit syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+		return 0, err
+	}
+	return int(limit.Max), nil
+}

cmd/utils/fdlimit_windows.go

@@ -39,3 +39,7 @@ func getFdLimit() (int, error) {
 	// Please see raiseFdLimit for the reason why we use hard coded 16K as the limit
 	return 16384, nil
 }
+
+func getFdMaxLimit() (int, error) {
+	return getFdLimit()
+}