bastion 0.53.2

client-go/procidentity_linux.go

@@ -0,0 +1,31 @@
+//go:build linux
+
+package main
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+// osProcIdentity reads /proc/<pid>/stat: field 22 (starttime, in clock ticks
+// since boot) is the identity — a reused pid has a later one — and field 3
+// (state) says whether the process is already stopped ('T', or 't' when
+// stopped by a tracer). Parsed after the LAST ')' so a name containing spaces
+// or parentheses cannot shift the fields.
+func osProcIdentity(pid int) (id string, stopped bool, ok bool) {
+	raw, err := os.ReadFile("/proc/" + strconv.Itoa(pid) + "/stat")
+	if err != nil {
+		return "", false, false
+	}
+	s := string(raw)
+	i := strings.LastIndex(s, ")")
+	if i < 0 || i+2 > len(s) {
+		return "", false, false
+	}
+	f := strings.Fields(s[i+2:])
+	if len(f) < 20 {
+		return "", false, false
+	}
+	return f[19], f[0] == "T" || f[0] == "t", true
+}