nachos.network
Class NetProcess

java.lang.Object
  nachos.userprog.UserProcess
      nachos.vm.VMProcess
          nachos.network.NetProcess

public class NetProcess
extends VMProcess

A VMProcess that supports networking syscalls.

Field Summary

Fields inherited from class nachos.userprog.UserProcess

coff, numPages, pageTable, stackPages

Constructor Summary

NetProcess()
Allocate a new process.

Method Summary

int	handleSyscall(int syscall, int a0, int a1, int a2, int a3) Handle a syscall exception.

Methods inherited from class nachos.vm.VMProcess

handleException, loadSections, restoreState, saveState, unloadSections

Methods inherited from class nachos.userprog.UserProcess

execute, initRegisters, newUserProcess, readVirtualMemory, readVirtualMemory, readVirtualMemoryString, writeVirtualMemory, writeVirtualMemory

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NetProcess

public NetProcess()

Allocate a new process.

Method Detail

handleSyscall

public int handleSyscall(int syscall,
                         int a0,
                         int a1,
                         int a2,
                         int a3)

Handle a syscall exception. Called by handleException(). The syscall argument identifies which syscall the user executed:

syscall#	syscall prototype
11	int connect(int host, int port);
12	int accept(int port);

Overrides:

handleSyscall in class UserProcess

Parameters:

syscall - the syscall number.

a0 - the first syscall argument.

a1 - the second syscall argument.

a2 - the third syscall argument.

a3 - the fourth syscall argument.

Returns:

the value to be returned to the user.