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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package pidowner
import (
"fmt"
"os"
"strings"
"tailscale.com/util/lineiter"
)
func ownerOfPID(pid int) (userID string, err error) {
file := fmt.Sprintf("/proc/%d/status", pid)
for lr := range lineiter.File(file) {
line, err := lr.Value()
if err != nil {
if os.IsNotExist(err) {
return "", ErrProcessNotFound
}
return "", err
}
if len(line) < 4 || string(line[:4]) != "Uid:" {
continue
}
f := strings.Fields(string(line))
if len(f) >= 2 {
userID = f[1] // real userid
}
}
if userID == "" {
return "", fmt.Errorf("missing Uid line in %s", file)
}
return userID, nil
}
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