TODO
====
* comments: mark "emulated" (windows) functions
* unsetenv winapi? see http://old.nabble.com/-patch--(msvc)-use-more-modern-facilities-for-setenv()-unsetenv()-td15877005.html
* investigate F_FULLFSYNC fcntl and fsync on Mac OS
* nanosleep
* fdtruncate win32
* waitid
DONE
====
* INRIA request for extended UNIX:
http://caml.inria.fr/mantis/view.php?id=5063
http://caml.inria.fr/mantis/view.php?id=2533
http://caml.inria.fr/mantis/view.php?id=3851
http://caml.inria.fr/mantis/view.php?id=480
* mkdtemp (see Jane Street Core)
* sysconf: get system configuration constants. In particular, PAGESIZE,
_SC_PHYS_PAGES, _SC_AVPHYS_PAGES, _SC_NPROCESSORS_CONF, _SC_NPROCESSORS_ONLN
(see Jane Street Core)
* sysinfo (see Jane Street Core)