SHR(3) SHR(3) NAME shr - global mountpoints SYNOPSIS bind '#σ' /shr #σ/share1 #σc/share1/service1 #σc/share1/service2 ... DESCRIPTION The shr device provides global mountpoints in the form of share directories where 9P services can be mounted. Effectively, it is a global mountpoint registry that is sep- arate from private namespaces. The shr device exports a mount tree and a control tree. The directories in the mount tree #σ are the share mountpoints themselves, while the directories in #σc contain the service files of the share. To create a new share, create the directory #σc/myshare To mount a service in that share, create the file #σc/myshare/myserv and then write a text string (suitable for strtoul; see atof(2)) giving the file descriptor number of an open 9P service. Any process with the proper permis- sion may then access #σ/myshare on the mount tree. The service file can be reopened and passed to mount (see bind(2)) or added to another share. Multiple services can be mounted under a share forming a union directory. New services get mounted before old ones. Removing the service file unmounts the service from the share. Creating shares and mounts requires read-write access in the share directory. The special user none is prohibited from these operations. EXAMPLES To mount a 9p service from srv(3) to the shr device mkdir '#σc'/myshare echo 3 > '#σc'/myshare/myserv <>/srv/myserv SOURCE SHR(3) SHR(3) /sys/src/9/port/devshr.c HISTORY Shr first appeared in 9front (July, 2011).