jscanner

commit 0c9cf3e014fcdb2b3db790accccbe9c8425f5e5f
parent 05d1676032a732c72fb03ac358f8e3cdbb498a95
Author: Matthias Jaros <jaros@mailbox.org>
Date:   Thu, 22 Jan 2026 21:39:21 +0100

Added baseline fd

Diffstat:
M
src/main/java/com/it_jaros/networkScanner/App.java
 | 
1
+
M
src/main/java/com/it_jaros/networkScanner/FdCounter.java
 | 
6
++++++

2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/src/main/java/com/it_jaros/networkScanner/App.java b/src/main/java/com/it_jaros/networkScanner/App.java
@@ -17,6 +17,7 @@ public class App {
             fd.start(20); // sample every 20ms
             List<Integer> openPorts = scanner.scanPorts(target, 10000);
             printPorts(target, openPorts);
+            System.out.println("FD baseline: " + fd.baseline());
             System.out.println("FD limit: " + fd.maxFds());
             System.out.println("Peak open FDs during scan: " + fd.peakOpenFds());
         }
diff --git a/src/main/java/com/it_jaros/networkScanner/FdCounter.java b/src/main/java/com/it_jaros/networkScanner/FdCounter.java
@@ -14,8 +14,10 @@ public final class FdCounter implements AutoCloseable {
     private final ScheduledExecutorService ses =
             Executors.newSingleThreadScheduledExecutor(Thread.ofPlatform().daemon().factory());
     private final AtomicLong peak = new AtomicLong(0);
+    private long baseline;
 
     public void start(long everyMillis) {
+        this.baseline = os.getOpenFileDescriptorCount();
         ses.scheduleAtFixedRate(() -> {
             long now = os.getOpenFileDescriptorCount();
             peak.accumulateAndGet(now, Math::max);
@@ -29,6 +31,10 @@ public final class FdCounter implements AutoCloseable {
     public long maxFds() {
         return os.getMaxFileDescriptorCount();
     }
+    
+    public long baseline() {
+        return this.baseline;
+    }
 
     @Override public void close() {
         ses.shutdownNow();