VENTI-SERVER(2) VENTI-SERVER(2)
NAME
vtsrvhello, vtlisten, vtgetreq, vtrespond - Venti server
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <venti.h>
typedef struct VtReq
{
VtFcall tx;
VtFcall rx;
...
} VtReq;
int vtsrvhello(VtConn *z)
VtSrv* vtlisten(char *addr)
VtReq* vtgetreq(VtSrv *srv)
void vtrespond(VtReq *req)
DESCRIPTION
These routines execute the server side of the venti(6) pro-
tocol.
Vtsrvhello executes the server side of the initial hello
transaction. It sets z->uid with the user name claimed by
the other side. Each new connection must be initialized by
running vtversion and then vtsrvhello. The framework below
takes care of this detail automatically; vtsrvhello is pro-
vided for programs that do not use the functions below.
Vtlisten, vtgetreq, and vtrespond provide a simple framework
for writing Venti servers.
Vtlisten announces at the network address addr, returning a
fresh VtSrv structure representing the service.
Vtgetreq waits for and returns the next read, write, sync,
or ping request from any client connected to the service
srv. Hello and goodbye messages are handled internally and
not returned to the client. The interface does not distin-
guish between the different clients that may be connected at
any given time. The request can be found in the tx field of
the returned VtReq.
Once a request has been served and a response stored in
r->rx, the server should call vtrespond to send the response
Page 1 Plan 9 (printed 11/23/24)
VENTI-SERVER(2) VENTI-SERVER(2)
to the client. Vtrespond frees the structure r as well as
the packets r->tx.data and r->rx.data.
EXAMPLE
/sys/src/cmd/venti contains two simple Venti servers ro.c
and devnull.c written using these routines. Ro is a read-
only Venti proxy (it rejects write requests). Devnull is a
dangerous write-only Venti server: it discards all blocks
written to it and returns error on all reads.
SOURCE
/sys/src/libventi
SEE ALSO
venti(2), venti-conn(2), venti-packet(2), venti(6), venti(8)
Page 2 Plan 9 (printed 11/23/24)