TUN-528: Move cloudflared into a separate repo

vendor/github.com/mholt/caddy/rlimit_posix.go

@@ -0,0 +1,37 @@
+// Copyright 2015 Light Code Labs, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !windows,!plan9,!nacl
+
+package caddy
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// checkFdlimit issues a warning if the OS limit for
+// max file descriptors is below a recommended minimum.
+func checkFdlimit() {
+	const min = 8192
+
+	// Warn if ulimit is too low for production sites
+	rlimit := &syscall.Rlimit{}
+	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, rlimit)
+	if err == nil && rlimit.Cur < min {
+		fmt.Printf("WARNING: File descriptor limit %d is too low for production servers. "+
+			"At least %d is recommended. Fix with \"ulimit -n %d\".\n", rlimit.Cur, min, min)
+	}
+
+}