SRV9(3)SRV9(3)NAME
srv9 - plan 9 server registry
SYNOPSIS
bind -c #₪ /srv
/srv/service1
/srv/service2
...
DESCRIPTION
On Inferno hosted on Plan 9, srv9 serves a one-level directory that
gives Inferno applications direct access to Plan 9 services posted in
its #s server registry, and allows Inferno applications to post ser‐
vices for access by Plan 9 applications. A service is represented by a
file descriptor, usually serving the common file service protocol
described in intro(5), allowing it to be mounted (see bind(1) and sys-
bind(2)) in the name space of an application in the other system.
To access a Plan 9 service in Inferno, open the desired service file;
the resulting file descriptor is connected to the associated Plan 9
service. When that service is a shared Plan 9 file service, srv9 auto‐
matically starts Plan 9's exportfs with appropriate options to make the
service accessible from Inferno. It can safely be shared with Plan 9
applications, but note that any path names mentioned in the attach
specifier (see mount(1) and attach(5)) will be in the Plan 9 applica‐
tion's name space, not the Inferno application's. (Indeed, a similar
caveat applies in Plan 9 itself.)
To export an Inferno service to Plan 9, create a new file such as
/srv/myserv using Sys->create with mode Sys->ORDWR (see sys-open(2))
and any desired permissions for the new service file. (Note that the
#₪ device must have been bound in with the -c option, as shown above,
to allow file creation.) If the create is successful, Plan 9's service
registry will have a new entry myserv, and the file descriptor returned
from create acts as a pipe to any Plan 9 application that opens the
associated service file in Plan 9. Typically on the Inferno side the
file descriptor is passed to sys-export(2) or made the standard input
of an Inferno file service (see intro(4)). The Plan 9 service file is
automatically removed when the Inferno file descriptor is no longer
referenced.
EXAMPLES
To make Plan 9's factotum available in Inferno:
mount -Aa /srv/factotum /mnt
(Note the -A option to suppress Inferno authentication.)
To mount the Plan 9 file service from which a Plan 9 machine booted:
mount -9 /srv/boot /n/local
The -9 option to mount(1) requests Plan 9 authentication; that could
also have been used instead of -A in the previous example.
To make the environment variables of the current Inferno name space
available to Plan 9:
fd := sys->create("/srv/infenv", Sys->ORDWR, 8r600);
sys->export(fd, "/env", Sys->EXPWAIT);
SOURCE
/emu/Plan9/devsrv9.c
SEE ALSOsys-bind(2), sys-open(2), sys-export(2), import(4), 9srvfs(4)
Plan 9 SRV9(3)