Editing Plan 9 from Bell Labs (section)

=== Special virtual filesystem ===

==== /proc ====
[[File:Plan 9 from Bell Labs (process management).png|thumb|right|Listing processes with [[ls|list contents of directory (ls, lc) command]]<ref name="unix-plan9-command-translation" /> in {{mono|/proc}}]]
{{Main |procfs}}
Instead of having system calls specifically for [[process management (computing)|process management]], Plan 9 provides the {{mono|/proc}} file system. Each [[Process (computing)|process]] appears as a directory containing information and control files which can be manipulated by the ordinary file IO system calls.<ref name = "design-paper" />

The file system approach allows Plan 9 processes to be managed with simple file management tools such as [[ls]] and [[cat (Unix)|cat]]; however, the processes cannot be copied and moved as files.<ref name="design-paper" />

==== /net ====
Plan 9 does not have specialised system calls or [[ioctl]]s for accessing the networking stack or networking hardware. Instead, the {{mono|/net}} file system is used. Network connections are controlled by reading and writing control messages to control files.  Sub-directories such as {{mono|/net/tcp}} and {{mono|/net/udp}} are used as an interface to their respective protocols.<ref name="design-paper" />