implement Selector.selectNow() and select()

classpath/java-nio.cpp

@@ -626,7 +626,17 @@ Java_java_nio_channels_SocketSelector_natDoSocketSelect(JNIEnv *e, jclass,
   }
 #endif
 
-  timeval time = { interval / 1000, (interval % 1000) * 1000 };
+  timeval time;
+  if (interval > 0) {
+    time.tv_sec = interval / 1000;
+    time.tv_usec = (interval % 1000) * 1000;
+  } else if (interval < 0) {
+    time.tv_sec = 0;
+    time.tv_usec = 0;
+  } else {
+    time.tv_sec = INT32_MAX;
+    time.tv_usec = 0;
+  }
   int r = ::select(max + 1, &(s->read), &(s->write), &(s->except), &time);
 
   if (r < 0) {

classpath/java/nio/channels/Selector.java

@@ -42,7 +42,11 @@ public abstract class Selector {
 
   public abstract Selector wakeup();
 
+  public abstract int selectNow() throws IOException;
+
   public abstract int select(long interval) throws IOException;
 
+  public abstract int select() throws IOException;
+
   public abstract void close();
 }

classpath/java/nio/channels/SocketSelector.java

@@ -48,7 +48,21 @@ class SocketSelector extends Selector {
     }
   }
 
+  public synchronized int selectNow() throws IOException {
+    return doSelect(-1);
+  }
+
+  public synchronized int select() throws IOException {
+    return doSelect(0);
+  }
+
   public synchronized int select(long interval) throws IOException {
+    if (interval < 0) throw new IllegalArgumentException();
+
+    return doSelect(interval);
+  }
+
+  public int doSelect(long interval) throws IOException {
     selectedKeys.clear();
 
     if (clearWoken()) return 0;