Merge branch 'sys_calls' of github.com:ilyanep/pintos-awesome into sys_calls

* 'sys_calls' of github.com:ilyanep/pintos-awesome:
  More file syscalls. Still not tested.
Merge branch 'sys_calls' of github.com:ilyanep/pintos-awesome into sys_calls

* 'sys_calls' of github.com:ilyanep/pintos-awesome: