37 lines
700 B
Go
37 lines
700 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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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/lineiter"
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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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for lr := range lineiter.File(file) {
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line, err := lr.Value()
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if err != nil {
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if os.IsNotExist(err) {
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return "", ErrProcessNotFound
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}
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return "", err
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}
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if len(line) < 4 || string(line[:4]) != "Uid:" {
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continue
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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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}
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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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