UserspaceEmulator: Add the access syscall

DevTools/UserspaceEmulator/Emulator.cpp

@@ -250,6 +250,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
     dbgprintf("Syscall: %s (%x)\n", Syscall::to_string((Syscall::Function)function), function);
 #endif
     switch (function) {
+    case SC_access:
+        return virt$access(arg1, arg2, arg3);
     case SC_getcwd:
         return virt$getcwd(arg1, arg2);
     case SC_ttyname:
@@ -1268,4 +1270,10 @@ int Emulator::virt$getcwd(FlatPtr buffer, size_t buffer_size)
     return rc;
 }
 
+int Emulator::virt$access(FlatPtr path, size_t path_length, int type)
+{
+    auto host_path = mmu().copy_buffer_from_vm(path, path_length);
+    return syscall(SC_access, host_path.data(), host_path.size(), type);
+}
+
 }

DevTools/UserspaceEmulator/Emulator.h

@@ -77,6 +77,7 @@ private:
 
     int virt$fork();
     int virt$execve(FlatPtr);
+    int virt$access(FlatPtr, size_t, int);
     int virt$sigaction(int, FlatPtr, FlatPtr);
     int virt$sigreturn();
     int virt$get_dir_entries(int fd, FlatPtr buffer, ssize_t);