Add mallinfo2 implementation.

4 files changed, 66 insertions, 0 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java
new file mode 100644
index 00000000000..1db73710d76
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java
@@ -0,0 +1,29 @@
+package com.yahoo.nativec;
+
+import com.sun.jna.Structure;
+
+public class MallInfo2 extends NativeC {
+    private final static Throwable initException = loadLibrary();
+    public static Throwable init() {
+        return initException;
+    }
+    // Equivalent JNA mapping
+    private static class MallInfo2Struct extends Structure {
+        public static class ByValue extends MallInfo2Struct implements Structure.ByValue { }
+        public long arena;     /* Non-mmapped space allocated (bytes) */
+        public long ordblks;   /* Number of free chunks */
+        public long smblks;    /* Number of free fastbin blocks */
+        public long hblks;     /* Number of mmapped regions */
+        public long hblkhd;    /* Space allocated in mmapped regions (bytes) */
+        public long usmblks;   /* See below */
+        public long fsmblks;   /* Space in freed fastbin blocks (bytes) */
+        public long uordblks;  /* Total allocated space (bytes) */
+        public long fordblks;  /* Total free space (bytes) */
+        public long keepcost;  /* Top-most, releasable space (bytes) */
+    }
+    private static native MallInfo2Struct.ByValue mallinfo2();
+    public MallInfo2() {
+        mallinfo = mallinfo2();
+    }
+    private final MallInfo2Struct mallinfo;
+}
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java b/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java
new file mode 100644
index 00000000000..e86fe16d3f7
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java
@@ -0,0 +1,20 @@
+package com.yahoo.nativec;
+
+import com.sun.jna.Native;
+import com.sun.jna.Platform;
+
+class NativeC {
+    protected static Throwable loadLibrary() {
+        if (Platform.isLinux()) {
+            try {
+                Native.register(Platform.C_LIBRARY_NAME);
+            } catch (Throwable e) {
+                return e;
+            }
+        } else {
+            return new RuntimeException("Platform is unsúpported. Only supported on linux.");
+        }
+        return null;
+    }
+
+}
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java b/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java
new file mode 100644
index 00000000000..b29ff889a25
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java
@@ -0,0 +1,12 @@
+package com.yahoo.nativec;
+
+import com.sun.jna.LastErrorException;
+
+public class PosixFAdvise extends NativeC {
+    public static final int POSIX_FADV_DONTNEED = 4; // See /usr/include/linux/fadvise.h
+    private final static Throwable initException = loadLibrary();
+    public static Throwable init() {
+        return initException;
+    }
+    public static native int posix_fadvise(int fd, long offset, long len, int flag) throws LastErrorException;
+}
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/package-info.java b/vespajlib/src/main/java/com/yahoo/nativec/package-info.java
new file mode 100644
index 00000000000..cdf497ea39b
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/package-info.java
@@ -0,0 +1,5 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+@ExportPackage
+package com.yahoo.nativec;
+
+import com.yahoo.osgi.annotation.ExportPackage;