SYSCALL2(_SysOpen, SYS_OPEN) // char*, int
SYSCALL3(_SysOpenChild, SYS_OPENCHILD) // int, char*, int
SYSCALL3(_SysReopen, SYS_REOPEN) // int, char*, int
SYSCALL2(_SysOpen, SYS_OPEN) // char*, int
SYSCALL3(_SysOpenChild, SYS_OPENCHILD) // int, char*, int
SYSCALL3(_SysReopen, SYS_REOPEN) // int, char*, int