38 lines
776 B
Go
38 lines
776 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pidowner
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import (
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"fmt"
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"os"
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"strings"
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"tailscale.com/util/lineread"
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)
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func ownerOfPID(pid int) (userID string, err error) {
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file := fmt.Sprintf("/proc/%d/status", pid)
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err = lineread.File(file, func(line []byte) error {
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if len(line) < 4 || string(line[:4]) != "Uid:" {
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return nil
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}
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f := strings.Fields(string(line))
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if len(f) >= 2 {
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userID = f[1] // real userid
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}
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return nil
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})
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if os.IsNotExist(err) {
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return "", ErrProcessNotFound
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}
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if err != nil {
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return
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}
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if userID == "" {
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return "", fmt.Errorf("missing Uid line in %s", file)
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}
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return userID, nil
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}
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