Add host_processor_info to Mac System B library

CHANGES.md

@@ -8,6 +8,7 @@ Next Release (4.2.1)
 Features
 --------
 * [#510](https://github.com/java-native-access/jna/pull/510): Added `GetCommState`, `GetCommTimeouts` `SetCommState` and `SetCommTimeouts` to `com.sun.jna.platform.win32.Kernel32`. Added `DCB` structure to `com.sun.jna.platform.win32.WinBase` - [@MBollig](https://github.com/MBollig)
+* [#514](https://github.com/java-native-access/jna/pull/514): Added `host_processor_info` to `com.sun.jna.platform.mac.SystemB`  - [@dbwiddis](https://github.com/dbwiddis)
 
 Bug Fixes
 ---------

contrib/platform/src/com/sun/jna/platform/mac/SystemB.java

@@ -26,6 +26,7 @@
 import com.sun.jna.Structure;
 import com.sun.jna.ptr.IntByReference;
 import com.sun.jna.ptr.LongByReference;
+import com.sun.jna.ptr.PointerByReference;
 
 /**
  * Author: Daniel Widdis Date: 6/5/15
@@ -50,6 +51,10 @@ public interface SystemB extends Library {
     static int CPU_STATE_IDLE = 2;
     static int CPU_STATE_NICE = 3;
 
+    // host_processor_info() flavor
+    static int PROCESSOR_BASIC_INFO = 1;
+    static int PROCESSOR_CPU_LOAD_INFO = 2;
+
     // Data size
     static int UINT64_SIZE = Native.getNativeSize(long.class);
     static int INT_SIZE = Native.getNativeSize(int.class);
@@ -304,4 +309,23 @@ int sysctlbyname(String name, Pointer oldp, IntByReference oldlenp,
      * @return 0 on success; sets errno on failure
      */
     int sysctlnametomib(String name, Pointer mibp, IntByReference size);
+
+    /**
+     * The host_processor_info function returns information about processors.
+     * 
+     * @param machPort
+     *            The control port for the host for which information is to be
+     *            obtained.
+     * @param flavor
+     *            The type of information requested.
+     * @param procCount
+     *            Pointer to the number of processors
+     * @param procInfo
+     *            Pointer to the structure corresponding to the requested flavor
+     * @param procInfoCount
+     *            Pointer to number of elements in the returned structure
+     * @return 0 on success; sets errno on failure
+     */
+    int host_processor_info(int machPort, int flavor, IntByReference procCount,
+        PointerByReference procInfo, IntByReference procInfoCount);
 }

contrib/platform/test/com/sun/jna/platform/mac/SystemBTest.java

@@ -17,16 +17,19 @@
 package com.sun.jna.platform.mac;
 
 import junit.framework.TestCase;
+
 import com.sun.jna.platform.mac.SystemB.HostCpuLoadInfo;
 import com.sun.jna.platform.mac.SystemB.HostLoadInfo;
 import com.sun.jna.platform.mac.SystemB.VMStatistics;
 import com.sun.jna.platform.mac.SystemB.VMStatistics64;
 
 import com.sun.jna.Memory;
+import com.sun.jna.Native;
 import com.sun.jna.Platform;
 import com.sun.jna.Pointer;
 import com.sun.jna.ptr.IntByReference;
 import com.sun.jna.ptr.LongByReference;
+import com.sun.jna.ptr.PointerByReference;
 
 /**
  * Exercise the {@link SystemB} class.
@@ -134,6 +137,23 @@ SystemB.HOST_CPU_LOAD_INFO, hostLoadInfo, new IntByReference(
 		assertTrue(hostLoadInfo.avenrun[0] > 0);
 	}
 
+	public void testHostProcessorInfo() {
+		int machPort = SystemB.INSTANCE.mach_host_self();
+		assertTrue(machPort > 0);
+
+		IntByReference procCount = new IntByReference();
+		PointerByReference procCpuLoadInfo = new PointerByReference();
+		IntByReference procInfoCount = new IntByReference();
+		int ret = SystemB.INSTANCE.host_processor_info(machPort,
+				SystemB.PROCESSOR_CPU_LOAD_INFO, procCount, procCpuLoadInfo,
+        			procInfoCount);
+		assertEquals(ret, 0);
+
+		assertTrue(procCount.getValue() > 0);
+		assertEquals(procCpuLoadInfo.getValue().getIntArray(0,
+				procInfoCount.getValue()).length, procInfoCount.getValue());
+	}
+
 	public static void main(java.lang.String[] argList) {
 		junit.textui.TestRunner.run(SystemBTest.class);
 	}