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01185e436f
This adds a new generic result type (motivated by golang/go#70084) to try it out, and uses it in the new lineutil package (replacing the old lineread package), changing that package to return iterators: sometimes over []byte (when the input is all in memory), but sometimes iterators over results of []byte, if errors might happen at runtime. Updates #12912 Updates golang/go#70084 Change-Id: Iacdc1070e661b5fb163907b1e8b07ac7d51d3f83 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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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