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NAME
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VtConn, vtconn, vtdial, vtfreeconn, vtsend, vtrecv, vtversion,
vtdebug, vthangup – Venti network connections
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SYNOPSIS
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#include <u.h>
#include <libc.h>
#include <venti.h>
typedef struct VtConn {
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int debug;
char *version;
char *uid;
char *sid;
char addr[256];
...
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} VtConn;
VtConn* vtconn(int infd, int outfd)
int vtreconn(VtConn *z, int infd, int outfd)
VtConn* vtdial(char *addr)
int vtredial(VtConn *z, char *addr)
int vtversion(VtConn *z)
int vtsend(VtConn *z, Packet *p)
Packet* vtrecv(VtConn *z)
void vtrecvproc(void *z)
void vtsendproc(void *z)
void vtdebug(VtConn *z, char *fmt, ...)
void vthangup(VtConn *z)
void vtfreeconn(VtConn *z)
extern int chattyventi;/* default 0 */
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DESCRIPTION
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A VtConn structure represents a connection to a Venti server (when
used by a client) or to a client (when used by a server). It contains
the following user-visible fields: debug, a flag enabling debugging
prints; version, the protocol version in use; uid, the (unverified)
name of the client; sid, the (unverified) name of the server;
and addr, the network
address of the remote side.
Vtconn initializes a new connection structure using file descriptors
infd and outfd (which may be the same) for reading and writing.
Vtdial dials the given network address (see dial(3)) and returns
a corresponding connection. It returns nil if the connection cannot
be established.
Vtversion exchanges version information with the remote side as
described in venti(7). The negotiated version is stored in z−>version.
Vtsend writes a packet (see venti-packet(3)) on the connection
z. The packet p should be a formatted Venti message as might be
returned by vtfcallpack; vtsend will add the two-byte length field
(see venti(7)) at the begnning. Vtsend frees p, even on error.
Vtrecv reads a packet from the connection z. Analogous to vtsend,
the data read from the connection must start with a two-byte length,
but the returned packet will omit them.
By default, vtsend and vtrecv block until the packet can be written
or read from the network. In a threaded program (see thread(3)),
this may not be desirable. If the caller arranges for vtsendproc
and vtrecvproc to run in their own procs (typically by calling
proccreate), then vtsend and vtrecv will yield the proc in which
they are run to other threads when
waiting on the network. The void* argument to vtsendproc and vtrecvproc
must be the connection structure z.
Vtdebug prints the formatted message to standard error when z−>debug
is set. Otherwise it is a no-op.
Vthangup hangs up a connection. It closes the associated file
descriptors and shuts down send and receive procs if they have
been started. Future calls to vtrecv or vtsend will return errors.
Additional calls to vthangup will have no effect.
Vtfreeconn frees the connection structure, hanging it up first
if necessary.
If the global variable chattyventi is set, the library prints
all Venti RPCs to standard error as they are sent or received.
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SOURCE
SEE ALSO
DIAGNOSTICS
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Routines that return pointers return nil on error. Routines returning
integers return 0 on success, –1 on error. All routines set errstr
on error.
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