SRV(3) Library Functions Manual SRV(3)NAME
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)NAME
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 kfs.name 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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