SRV(4)

NAME

srv, srvold9p, 9fs, srvssh − start network file service

SYNOPSIS

srv [ -abceCmq ] [ -s seconds ] [net!]system [!service] [ srvname [ mtpt ] ]

srvssh [ -r ] [ -R ] [ -s ] [ -u u9fspath ] system [ srvname [ mtpt ] ]

9fs [net!]system [mountpoint]

srvold9p [ -abcCd ] [ -u user ] [ -s | [ -m mountpoint ] ] [ -x command | -n network-addr | -f file ] [ -F ] [ -p servicename ]

DESCRIPTION

Srv dials the given machine and initializes the connection to serve the 9P protocol. It then creates in /srv a file named srvname. Users can then mount (see bind(1)) the service, typically on a name in /n, to access the files provided by the remote machine. If srvname is omitted, the first argument to srv is used. Option m directs srv to mount the service on /n/system or onto mtpt if it is given. Option q suppresses complaints if the /srv file already exists. The a, b, c, and C flags are used to control the mount flag as in bind(1). The e flag causes srv to treat system as a shell command to be executed rather than an address to be dialed. The s flag causes srv to sleep for the specified number of seconds after establishing the connection before posting and mounting it. This is sometimes needed by srvssh.

The specified service must serve 9P. Usually service can be omitted; when calling some non-Plan 9 systems, a service such as u9fs must be mentioned explicitly.

The 9fs command does the srv and the mount necessary to make available the files of system on network net. The files are mounted on mountpoint, if given; otherwise they are mounted on /n/system. If system contains / characters, only the last element of system is used in the /n name.

9fs recognizes some special names, such as dump to make the dump file system available on /n/dump. 9fs is an rc(1) script; examine it to see what local conventions apply.

Srvssh is an rc(1) connects to a remote Unix system via ssh(1) and starts u9fs(4). The -u option specifies the path to the u9fs binary on the remote system. (By default, an unrooted path of u9fs is used; if the binary is in the path of the remote SSH server, you don’t need the -u option.) For information about the other options, see the introductory comment in /rc/bin/srvssh. The arguments are the same as srv.

Srvold9p is a compatibilty hack to allow Fourth Edition Plan 9 systems to connect to older 9P servers. It functions as a variant of srv that performs a version translation on the 9P messages on the underlying connection. Some of its options are the same as those of srv; the special ones are:

-d Enable debugging

-u user
When connecting to the remote server, log in as user. Since srvold9p does no authentication, and since new kernels cannot authenticate to old services, the likeliest value of user is none.

-x command
Run command and use its standard input and output as the 9P service connection. If the command string contains blanks, it should be quoted.

-n network-addr
Dial network-addr to establish the connection.

-f file
Use file (typically an existing srv(3) file) as the connection.

-F Insert a special (internal) filter process to the connection to maintain message boundaries; usually only needed on TCP connections.

-p servicename
Post the service under srv(3) as /srv/servicename.

Srvold9p is run automatically when a cpu(1) call is received on the service port for the old protocol.

EXAMPLES

To see kremvax’s and deepthought’s files in /n/kremvax and /n/deepthought:

9fs kremvax
9fs hhgttg /n/deepthought

To mount as user none a connection to an older server kgbsun:

srvold9p -u none -m /n/kgbsun -p kgbsun -n il!kgbsun

Other windows may then mount the connection directly:

mount /srv/kgbsun /n/kgbsun

To connect to an instance of the Unix server u9fs(4) started via ssh(1):

srvssh unix

NOTE

The TCP port used for 9P is 564.

FILES

/srv/∗ ports to file systems and servers posted by srv and 9fs

SOURCE

/sys/src/cmd/srv.c
/rc/bin/9fs
/rc/bin/srvssh

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