+ register and call event

src/internal.cpp

@@ -35,3 +35,15 @@ void sendSignal(pid_t pid, int signalNumber) {
 void onSignal(int signalNumber, void(*callback)(int)) {
     signal(signalNumber, callback);
 }
+
+InterruptEntry *getInterrupTable(){
+    return (InterruptEntry*)((char*)getSharedMemory() + sizeof(Registers) + 1024/*reserved*/);
+}
+
+bool callEvent(EventType type) {
+    auto ivt = getInterrupTable();
+    if(ivt[type].pid != 0){
+        sendSignal(ivt[type].pid, ivt[type].signum);
+    }
+    return true;
+}

src/internal.h

@@ -7,6 +7,8 @@
 #include "GraphicMode.h"
 #include "Color.h"
 #include <sys/types.h>
+#include <vector>
+#include <functional>
 
 /**
  * the Control Registers
@@ -47,7 +49,10 @@ struct Impl {
     int sharedMemoryPid;
     key_t sharedMemoryKey;
     int sharedMemorySize;
+    int interruptEntyCount = 64;
+    std::vector<std::function<void()>> eventTable;
 };
+
 extern Impl impl;
 
 void *getSharedMemory();
@@ -67,6 +72,9 @@ void sendSignal(pid_t pid, int signalNumber);
  */
 void onSignal(int signalNumber, void(*callback)(int));
 
+
+InterruptEntry *getInterrupTable();
+
 /**
  * set layout version.
  * @param newValue new layout version number.

src/vkvm.cpp

@@ -1,8 +1,28 @@
 #include "vkvm.h"
 #include "internal.h"
+#include <unistd.h>
+#include <csignal>
 
 void initialize(int pid) {
     impl.sharedMemoryPid = pid;
     impl.sharedMemoryKey = 892348;
     impl.sharedMemorySize = 0;
 }
+
+bool registerEvent(EventType type, std::function<void()> handler) {
+    int signum = SIGUSR1 + impl.eventTable.size();
+
+    auto ivt = getInterrupTable();
+    ivt[type].pid = getpid();
+    ivt[type].signum = signum;
+
+    onSignal(signum, [](int sig){
+        if(sig >= SIGUSR1){
+            if((sig - SIGUSR1) < impl.eventTable.size()){
+                impl.eventTable[sig - SIGUSR1]();
+            }
+        }
+    });
+
+    return true;
+}