+ getSharedMemory

src/internal.cpp

@@ -1,5 +1,27 @@
 #include "internal.h"
+#include <sys/shm.h>
+Impl impl;
 
-Internal internal;
+void *getSharedMemory(){
+    impl.sharedMemorySize = 8000;
 
+    auto id = shmget(impl.sharedMemoryKey, impl.sharedMemorySize, 0644 | IPC_CREAT);
+    if(id == -1){
+        //error
+        impl.sharedMemorySize = 0;
+        return nullptr;
+    }
 
+    void *data = shmat(id, nullptr, 0);
+    if(data == (char*)(-1)){
+        //error
+        impl.sharedMemorySize = 0;
+        return nullptr;
+    }
+
+    return data;
+}
+
+int getSharedMemorySize(){
+    return impl.sharedMemorySize;
+}

src/internal.h

@@ -6,13 +6,14 @@
 #include "LayoutVersion.h"
 #include "GraphicMode.h"
 #include "Color.h"
+#include <sys/types.h>
 
 /**
  * the Control Registers
  * @author Julian Hinxlage
  * @since 0.1.0
  */
-struct Registers{
+struct Registers {
     int layout_version;
     int trigger_reset;
     int width_pixels;
@@ -34,7 +35,7 @@ struct Registers{
     int keyboardBuffer_index_r;
 };
 
-struct InterruptEntry{
+struct InterruptEntry {
     int pid;
     int signum;
 };
@@ -42,10 +43,16 @@ struct InterruptEntry{
 /**
  * internal values for the library.
  */
-struct Internal{
+struct Impl {
     int sharedMemoryPid;
+    key_t sharedMemoryKey;
+    int sharedMemorySize;
 };
-extern Internal internal;
+extern Impl impl;
+
+void *getSharedMemory();
+
+int getSharedMemorySize();
 
 /**
  * set layout version.

src/vkvm.cpp

@@ -2,5 +2,7 @@
 #include "internal.h"
 
 void initialize(int pid) {
-    internal.sharedMemoryPid = pid;
+    impl.sharedMemoryPid = pid;
+    impl.sharedMemoryKey = 892348;
+    impl.sharedMemorySize = 0;
 }