https://manpages.ubuntu.com/manpages/xenial/man3/ModPerl::CScan.3pm.html
Ubuntu Manpage: ModPerl::CScan - scan C language files for easily recognized constructs.
scan C language files for easily recognized constructs.
c language
https://lwn.net/Articles/178088/
CSCAN I/O scheduler for 2.6.10 kernel [LWN.net]
scheduler