From 077869e1bdf42433947b52d8787683ea431196ca Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Tue, 26 Apr 2022 15:17:53 +0200
Subject: Add MallInfo

---
 .../main/java/com/yahoo/nativec/GLibcVersion.java  | 14 +++++++++++
 .../src/main/java/com/yahoo/nativec/MallInfo.java  | 29 ++++++++++++++++++++++
 .../src/main/java/com/yahoo/nativec/MallInfo2.java |  4 +--
 .../src/main/java/com/yahoo/nativec/NativeC.java   |  4 +--
 .../main/java/com/yahoo/nativec/PosixFAdvise.java  |  4 +--
 5 files changed, 49 insertions(+), 6 deletions(-)
 create mode 100644 vespajlib/src/main/java/com/yahoo/nativec/GLibcVersion.java
 create mode 100644 vespajlib/src/main/java/com/yahoo/nativec/MallInfo.java

(limited to 'vespajlib/src/main')

diff --git a/vespajlib/src/main/java/com/yahoo/nativec/GLibcVersion.java b/vespajlib/src/main/java/com/yahoo/nativec/GLibcVersion.java
new file mode 100644
index 00000000000..b404e5b00df
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/GLibcVersion.java
@@ -0,0 +1,14 @@
+package com.yahoo.nativec;
+
+public class GLibcVersion {
+    private final static Throwable initException = NativeC.loadLibrary(GLibcVersion.class);
+    public static Throwable init() {
+        return initException;
+    }
+    private final String version;
+    public GLibcVersion() {
+        version = gnu_get_libc_version();
+    }
+    private native static String gnu_get_libc_version();
+    public String version() { return version; }
+}
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/MallInfo.java b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo.java
new file mode 100644
index 00000000000..c9d781ddd4d
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo.java
@@ -0,0 +1,29 @@
+package com.yahoo.nativec;
+
+import com.sun.jna.Structure;
+
+public class MallInfo {
+    private final static Throwable initException = NativeC.loadLibrary(MallInfo.class);
+    public static Throwable init() {
+        return initException;
+    }
+    // Equivalent JNA mapping
+    private static class MallInfoStruct extends Structure {
+        public static class ByValue extends MallInfoStruct implements Structure.ByValue { }
+        public int arena;     /* Non-mmapped space allocated (bytes) */
+        public int ordblks;   /* Number of free chunks */
+        public int smblks;    /* Number of free fastbin blocks */
+        public int hblks;     /* Number of mmapped regions */
+        public int hblkhd;    /* Space allocated in mmapped regions (bytes) */
+        public int usmblks;   /* See below */
+        public int fsmblks;   /* Space in freed fastbin blocks (bytes) */
+        public int uordblks;  /* Total allocated space (bytes) */
+        public int fordblks;  /* Total free space (bytes) */
+        public int keepcost;  /* Top-most, releasable space (bytes) */
+    }
+    private static native MallInfoStruct.ByValue mallinfo();
+    public MallInfo() {
+        mallinfo = mallinfo();
+    }
+    private final MallInfoStruct mallinfo;
+}
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java
index 1db73710d76..73adcc5f9a2 100644
--- a/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java
+++ b/vespajlib/src/main/java/com/yahoo/nativec/MallInfo2.java
@@ -2,8 +2,8 @@ package com.yahoo.nativec;
 
 import com.sun.jna.Structure;
 
-public class MallInfo2 extends NativeC {
-    private final static Throwable initException = loadLibrary();
+public class MallInfo2 {
+    private final static Throwable initException = NativeC.loadLibrary(MallInfo2.class);
     public static Throwable init() {
         return initException;
     }
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java b/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java
index e86fe16d3f7..4d808b4b155 100644
--- a/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java
+++ b/vespajlib/src/main/java/com/yahoo/nativec/NativeC.java
@@ -4,10 +4,10 @@ import com.sun.jna.Native;
 import com.sun.jna.Platform;
 
 class NativeC {
-    protected static Throwable loadLibrary() {
+    static Throwable loadLibrary(Class<?> cls) {
         if (Platform.isLinux()) {
             try {
-                Native.register(Platform.C_LIBRARY_NAME);
+                Native.register(cls, Platform.C_LIBRARY_NAME);
             } catch (Throwable e) {
                 return e;
             }
diff --git a/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java b/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java
index b29ff889a25..3e2c26d2ef2 100644
--- a/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java
+++ b/vespajlib/src/main/java/com/yahoo/nativec/PosixFAdvise.java
@@ -2,9 +2,9 @@ package com.yahoo.nativec;
 
 import com.sun.jna.LastErrorException;
 
-public class PosixFAdvise extends NativeC {
+public class PosixFAdvise {
     public static final int POSIX_FADV_DONTNEED = 4; // See /usr/include/linux/fadvise.h
-    private final static Throwable initException = loadLibrary();
+    private final static Throwable initException = NativeC.loadLibrary(PosixFAdvise.class);
     public static Throwable init() {
         return initException;
     }
-- 
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