implement setid functions and unlink

Preliminary implementation of strtol()

correction to include guard of stat

Aarch64: Update syscall usage

Dan Robertson authored 7 years ago and Dan Robertson committed 7 years ago

Don't use syscalls that are non-existent on Aarch64 linux boxes. The
FORK and RMDIR syscalls are no longer present and the CLONE and UNLINKAT
syscalls are used instead.

Imp va_arg for fcntl; fcntl test

Implement atof

fcntl: open should use a va_list

Implement fcntl

The current implementation of open requires the user to pass all three
args to the function. It should use a va_list and allow a user to
provide only the filename and flags.