62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
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//go:build linux
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package main
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import (
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"fmt"
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"os"
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"strconv"
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"strings"
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"syscall"
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)
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// spec:26174-planctl-context-tokens/R1.2+R6.3+D§3.3
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// ppidOf returns the parent PID of pid by reading /proc/<pid>/status.
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// Returns 0 on error.
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func ppidOf(pid int) int {
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data, err := os.ReadFile(fmt.Sprintf("/proc/%d/status", pid))
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if err != nil {
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return 0
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}
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for _, line := range strings.Split(string(data), "\n") {
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if strings.HasPrefix(line, "PPid:") {
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s := strings.TrimSpace(strings.TrimPrefix(line, "PPid:"))
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n, err := strconv.Atoi(s)
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if err != nil {
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return 0
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}
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return n
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}
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}
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return 0
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}
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// spec:26174-planctl-context-tokens/R6.3+D§3.3
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// processAlive reports whether a process with pid exists.
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func processAlive(pid int) bool {
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if pid <= 0 {
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return false
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}
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return syscall.Kill(pid, 0) == nil
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}
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// spec:26174-planctl-context-tokens/R6.3+D§3.3+D§4.1
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// processStartTimeSec returns the process start time as raw clock ticks since boot,
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// read from /proc/<pid>/stat field 22 (starttime). The hook writes the same units
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// (clock ticks) on Linux per §5.5/§4.1, so comparison units match.
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//
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// The name retains "Sec" for API symmetry with the macOS implementation (which
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// returns epoch seconds). Within a platform both sides match; cross-platform
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// comparison never happens.
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//
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// /proc/<pid>/stat is a single line: "pid (comm) state ppid ... starttime ...".
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// `comm` can contain spaces and parens. We find the LAST ')' and tokenize the
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// remainder so comm noise can't shift field indices.
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func processStartTimeSec(pid int) (int64, error) {
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data, err := os.ReadFile(fmt.Sprintf("/proc/%d/stat", pid))
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if err != nil {
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return 0, err
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}
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return parseStatStartTime(string(data))
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}
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