SRV9(3)                     (Plan 9)                      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 direc-
          tory that gives Inferno applications direct access to Plan 9
          services posted in its #s server registry, and allows
          Inferno applications to post services for access by Plan 9
          applications.  A service is represented by a file descrip-
          tor, 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 ser-
          vice file; the resulting file descriptor is connected to the
          associated Plan 9 service.  When that service is a shared
          Plan 9 file service, srv9 automatically starts Plan 9's
          exportfs with appropriate options to make the service acces-
          sible 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 application'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 cre-
          ation.)  If the create is successful, Plan 9's service reg-
          istry will have a new entry myserv, and the file descriptor
          returned from create acts as a pipe to any Plan 9 applica-
          tion that opens the associated service file in Plan 9.  Typ-
          ically 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 automati-
          cally removed when the Inferno file descriptor is no longer
          referenced.

     EXAMPLES
          To make Plan 9's factotum available in Inferno:

     SRV9(3)                     (Plan 9)                      SRV9(3)

               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 ALSO
          sys-bind(2), sys-open(2), sys-export(2), import(4),
          9srvfs(4)