tailscale/metrics/fds_linux.go

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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package metrics
import "os"
func currentFDs() int {
// TODO(bradfitz): do this without so many allocations on Linux.
ents, _ := os.ReadDir("/proc/self/fd")
return len(ents)
}