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srv(3) [plan9 man page]

SRV(3)							     Library Functions Manual							    SRV(3)

srv - server registry SYNOPSIS
bind #s /srv #s/service1 #s/service2 ... DESCRIPTION
The srv device provides a one-level directory holding already-open channels to services. In effect, srv is a bulletin board on which pro- cesses may post open file descriptors to make them available to other processes. To install a channel, create a new file such as /srv/myserv and then write a text string (suitable for strtoul; see atof(2)) giving the file descriptor number of an open file. Any process may then open /srv/myserv to acquire another reference to the open file that was reg- istered. An entry in srv holds a reference to the associated file even if no process has the file open. Removing the file from /srv releases that reference. It is an error to write more than one number into a server file, or to create a file with a name that is already being used. EXAMPLE
To drop one end of a pipe into /srv, that is, to create a named pipe: int fd, p[2]; char buf[32]; pipe(p); fd = create("/srv/namedpipe", 1, 0666); sprint(buf, "%d", p[0]); write(fd, buf, strlen(buf)); close(fd); close(p[0]); write(p[1], "hello", 5); At this point, any process may open and read /srv/namedpipe to receive the hello string. Data written to /srv/namedpipe will be received by executing read(p[1], buf, sizeof buf); in the above process. SOURCE
/sys/src/9/port/devsrv.c SRV(3)

Check Out this Related Man Page

KFS(4)							     Kernel Interfaces Manual							    KFS(4)

kfs - disk file system SYNOPSIS
disk/kfs [ -rc ] [ -b n ] [ -f file ] [ -n name ] [ -s ] DESCRIPTION
Kfs is a local user-level file server for a Plan 9 terminal with a disk. It maintains a hierarchical Plan 9 file system on the disk and offers 9P (see intro(5)) access to it. Kfs begins by checking the file system for consistency, rebuilding the free list, and placing a file descriptor in /srv/name, where name is the service name (default kfs). If the file system is inconsistent, the user is asked for per- mission to ream (q.v.) the disk. The file system is not checked if it is reamed. The options are b n If the file system is reamed, use n byte blocks. Larger blocks make the file system faster and less space efficient. 1024 and 4096 are good choices. N must be a multiple of 512. c Do not check the file system. f file Use file as the disk. The default is /dev/sd0fs. n name Use as the name of the service. r Ream the file system, erasing all of the old data and adding all blocks to the free list. s Post file descriptor zero in /srv/service and read and write protocol messages on file descriptor one. EXAMPLES
Create a file system with service name kfs.local and mount it on /n/kfs. % kfs -rb4096 -nlocal % mount -c /srv/kfs.local /n/kfs FILES
/dev/sd0fs Default file holding blocks. SOURCE
/sys/src/cmd/disk/kfs SEE ALSO
kfscmd(8), mkfs(8), prep(8), wren(3) KFS(4)
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