Kernel: We now store the processes exit code

kernel/arch/x86_64/IDT.cpp

@@ -122,7 +122,7 @@ namespace IDT
 		{
 			auto message = BAN::String::formatted("{}, aborting\n", isr_exceptions[isr]);
 			(void)Kernel::Process::current().write(STDERR_FILENO, message.data(), message.size());
-			Kernel::Process::current().exit();
+			Kernel::Process::current().exit(1);
 		}
 		else
 		{

kernel/include/kernel/Process.h

@@ -40,7 +40,7 @@ namespace Kernel
 		static BAN::ErrorOr<Process*> create_userspace(BAN::StringView);
 		~Process();
 
-		[[noreturn]] void exit();
+		[[noreturn]] void exit(int status);
 
 		void add_thread(Thread*);
 		void on_thread_exit(Thread&);

kernel/kernel/Process.cpp

@@ -118,12 +118,13 @@ namespace Kernel
 			if (m_threads[i] == &thread)
 				m_threads.remove(i);
 		if (m_threads.empty())
-			exit();
+			exit(0);
 	}
 
-	void Process::exit()
+	void Process::exit(int status)
 	{
 		m_lock.lock();
+		m_exit_status.exit_code = status;
 		m_exit_status.exited = true;
 		while (m_exit_status.waiting > 0)
 		{

kernel/kernel/Shell.cpp

@@ -363,7 +363,7 @@ argument_done:
 		}
 		else if (arguments.front() == "exit")
 		{
-			Process::current().exit();
+			Process::current().exit(0);
 		}
 		else if (arguments.front() == "time")
 		{

kernel/kernel/Syscall.cpp

@@ -7,9 +7,9 @@
 namespace Kernel
 {
 
-	void sys_exit()
+	void sys_exit(int status)
 	{
-		Process::current().exit();
+		Process::current().exit(status);
 	}
 
 	long sys_read(int fd, void* buffer, size_t size)
@@ -162,7 +162,7 @@ namespace Kernel
 		switch (syscall)
 		{
 		case SYS_EXIT:
-			sys_exit();
+			sys_exit((int)arg1);
 			break;
 		case SYS_READ:
 			ret = sys_read((int)arg1, (void*)arg2, (size_t)arg3);