initial commit

electron/services/jlink/jlinkSessionPorts.cjs

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+const { canBindTcpPort } = require('./jlinkPortCheck.cjs');
+
+/** Preferred ports per session (dynamic fallback if busy). */
+const JLINK_PORTS_BY_SESSION = {
+    receiver: {
+        gdb: 29021,
+        swo: 29022,
+        rtt: 19021,
+    },
+    transmitter: {
+        gdb: 29031,
+        swo: 29032,
+        rtt: 19022,
+    },
+};
+
+const GDB_PORT_RANGE = { min: 29000, max: 29199 };
+const SWO_PORT_RANGE = { min: 29000, max: 29199 };
+const RTT_PORT_RANGE = { min: 19020, max: 19199 };
+
+const portCandidates = (preferred, min, max) => {
+    const ordered = [preferred];
+    for (let port = min; port <= max; port++) {
+        if (port !== preferred) ordered.push(port);
+    }
+    return ordered;
+};
+
+const pickTcpPort = async (preferred, range, reserved) => {
+    for (const port of portCandidates(preferred, range.min, range.max)) {
+        if (reserved.has(port)) continue;
+        if (await canBindTcpPort('127.0.0.1', port)) {
+            reserved.add(port);
+            return port;
+        }
+    }
+
+    throw new Error(
+        `사용 가능한 TCP 포트가 없습니다 (선호 ${preferred}, 범위 ${range.min}-${range.max}). JLinkGDBServerCL을 모두 종료한 뒤 다시 시도하세요.`
+    );
+};
+
+const allocateSessionPorts = async (sessionId, reserved = new Set()) => {
+    const preferred = JLINK_PORTS_BY_SESSION[sessionId];
+    if (!preferred) {
+        throw new Error(`Unknown session for port allocation: ${sessionId}`);
+    }
+
+    return {
+        gdb: await pickTcpPort(preferred.gdb, GDB_PORT_RANGE, reserved),
+        swo: await pickTcpPort(preferred.swo, SWO_PORT_RANGE, reserved),
+        rtt: await pickTcpPort(preferred.rtt, RTT_PORT_RANGE, reserved),
+    };
+};
+
+module.exports = {
+    JLINK_PORTS_BY_SESSION,
+    allocateSessionPorts,
+};