35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
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package main
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// spec:26174-planctl-context-tokens/R6.3+D§3.3
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// parseStatStartTime extracts field 22 (starttime — clock ticks since boot)
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// from a /proc/<pid>/stat line. The `comm` field at position 2 is wrapped in
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// parens and can contain any bytes including spaces and parens; we tokenize
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// only the remainder after the LAST ')' so comm contents can't shift indices.
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//
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// Lives in a non-build-tagged file so it compiles — and is testable — on all
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// platforms. Only proc_linux.go's processStartTimeSec actually consumes it.
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func parseStatStartTime(stat string) (int64, error) {
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i := strings.LastIndex(stat, ")")
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if i < 0 || i+1 >= len(stat) {
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return 0, fmt.Errorf("stat: no ')' terminator")
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}
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// After the ')' we have: " state ppid ... starttime ..."
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// Fields counted from 1 in the man page: (1) pid, (2) (comm), (3) state, ..., (22) starttime.
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// Remainder starts at field 3, so starttime is index 19 (22-3).
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fields := strings.Fields(stat[i+1:])
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if len(fields) < 20 {
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return 0, fmt.Errorf("stat: only %d tail fields", len(fields))
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}
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n, err := strconv.ParseInt(fields[19], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("stat: starttime parse: %w", err)
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}
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return n, nil
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}
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