JNI: load ARM sf/hf according to JVM binary. Linux Lines Status Update.

README.txt

@@ -1,4 +1,32 @@
-jSSC-2.8.0 Release version (24.01.2014)
+[VinceOPS] jSSC-2.8.0 - First Fork and Changes (28.01.2015)
+
+Essentially working on Linux (PC & ARM), this fork will contain small fixes/changes which match my projetcs requirements.
+
+In this build:
+	Fixes:
+		* DSR "off" event (DSR state 0) was not emitted using (PC) Ubuntu 13.10 and (ARM SF) Debian Wheezy.
+		* Using the current JVM "arm type" (Soft-Float / Hard-Float) to define which library (sf or hf) should be loaded. Indeed, on MULTIARCH systems (like Debian), it is possible to use a Soft-Float JVM whereas the rootfs is Hard-Float. Reading /proc/self/exe ELF format tells what is the rootfs "arm type", not the JVM (loading an ARMHF library with an ARMSF JVM obviously fails).
+
+Note:
+	How did I compile the .so libraries on my PC (x86_64) running on Ubuntu 13.10:
+		* PC (x86_64): g++ jssc.cpp  -I/<jdk_path>/include -I/<jdk_path>/include/linux -shared -fPIC -o libjSSC-2.8_x86_64.so
+		* PC (x86), using g++-multilib: g++ jssc.cpp  -I/usr/lib/jvm/jdk1.8.0_25/include -I/usr/lib/jvm/jdk1.8.0_25/include/linux -shared -fPIC -m32 -o libjSSC-2.8_x86.so
+
+		* ARM (SF): arm-linux-gnueabi-g++ jssc.cpp  -I/<jdk_path>/include -I/<jdk_path>/include/linux -shared -o libjSSC-2.8_armsf.so
+		* ARM (HF): arm-linux-gnueabihf-g++-4.8 jssc.cpp  -I/<jdk_path>/include -I/<jdk_path>/include/linux -shared -fPIC -o libjSSC-2.8_armhf.so
+
+		Any version of the ARM toolchain > 4.7 was fine.
+		Optimisation level 2 (-O2).
+
+
+
+
+
+============= Previous Builds ==============
+
+///////////////////////////////////////////
+//jSSC-2.8.0 Release version (24.01.2014)//
+///////////////////////////////////////////
 
 This version contains native libs for Windows(x86, x86-64), Linux(x86, x86-64, ARM soft & hard float), Solaris(x86, x86-64), Mac OS X(x86, x86-64, PPC, PPC64).
 All native libs contains in the jssc.jar file and you don't need manage native libs manually.
@@ -15,8 +43,6 @@ In this build:
 
 With Best Regards, Sokolov Alexey aka scream3r.
 
-============= Previous Builds ==============
-
 ///////////////////////////////////////////
 //jSSC-2.6.0 Release version (01.06.2013)//
 ///////////////////////////////////////////

src/cpp/_nix_based/jssc.cpp

@@ -654,7 +654,12 @@ JNIEXPORT jboolean JNICALL Java_jssc_SerialNativeInterface_sendBreak
  */
 int getLinesStatus(jlong portHandle) {
     int statusLines;
-    ioctl(portHandle, TIOCMGET, &statusLines);
+
+    if(ioctl(portHandle, TIOCMGET, &statusLines) != 0) {
+        // return 0 in case of failure, otherwise statusLines stays unchanged
+        return 0;
+    }
+
     return statusLines;
 }
 

src/java/jssc/SerialNativeInterface.java

@@ -122,7 +122,8 @@ else if(architecture.equals("arm")) {//since 2.1.0
             }
             else {
                 try {
-                    Process readelfProcess =  Runtime.getRuntime().exec("readelf -A /proc/self/exe");
+                    // get the ELF format of the JVM binary to know which library should be loaded (soft-float or hard-float)
+                    Process readelfProcess = Runtime.getRuntime().exec("readelf -A " + System.getProperty("java.home") + "/bin/java");
                     BufferedReader reader = new BufferedReader(new InputStreamReader(readelfProcess.getInputStream()));
                     String buffer = "";
                     while((buffer = reader.readLine()) != null && !buffer.isEmpty()){