basic fork foo, function itself is empty

kernel/syscall/handler.cc

@@ -80,8 +80,8 @@ extern "C" size_t syscall_handler(size_t sysnum, size_t p1, size_t p2,
             return Skeleton::receive(Guard::enter().vault(), (void*)(p1), p2);
          case Syscall::ID::REPLY:
             return Skeleton::reply(Guard::enter().vault(), (void*)(p1), p2);
-      //   case Syscall::ID::FORK:
-      //      return Skeleton::fork(v, user);
+         case Syscall::ID::FORK:
+            return Skeleton::fork(Guard::enter().vault(), user);
             break;
 
 

kernel/syscall/skeleton.cc

@@ -392,7 +392,9 @@ bool reply(Vault& v, const void* buffer, size_t size) {
   return true;
 }
 
-
+int fork(Vault &vault, InterruptContext *user_context) {
+  return 0;
+}
 
 
   }  // namespace Skeleton

kernel/syscall/skeleton.h

@@ -1,4 +1,5 @@
 #pragma once
+#include "arch/idt.h"
 
 #include "types.h"
 #include "../memory/pagetable.h"
@@ -29,7 +30,7 @@ void invlpg(uintptr_t virt_addr);
 bool send(Vault &vault, int pid, const void* sbuffer, size_t ssize, void* rbuffer, size_t rsize);
 int receive(Vault &vault, void* buffer, size_t size);
 bool reply(Vault &vaul, const void* buffer, size_t size);
-//int fork(Vault &vault, InterruptContext *user);
+int fork(Vault &vault, InterruptContext *user);
 
 
 }  // namespace Skeleton

kernel/syscall/stub.h

@@ -22,7 +22,7 @@ namespace Syscall {
     SEND = 13,
     RECEIVE = 14,
     REPLY = 15,
-    //	FORK = 16
+    FORK = 16
 };
 }  // namespace Syscall
 
@@ -97,3 +97,8 @@ extern "C" ssize_t sys_safe_call(Syscall::ID id, size_t p1, size_t p2,
 [[gnu::always_inline]] static inline bool reply(const void* buffer, size_t size) {
 	return sys_call(Syscall::ID::REPLY, (size_t)buffer, size,0,0,0);
 }
+
+
+[[gnu::always_inline]] static inline int fork() {
+	return sys_call(Syscall::ID::FORK,0,0,0,0,0);
+}