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RPC routines allow C programs to make procedure calls on other machines across the network. First, the client calls a procedure to send a request to the server. Upon receipt of the request, the server calls a dispatch routine to perform the requested service, and then sends back a reply. Finally, the procedure call returns to the client.
These routines are associated with the server side of the RPC mechanism. Some of them are called by the server side dispatch function, while others (such as svc_run()) are called when the server is initiated.
The SVCXPRT data structure is defined in the RPC/XDR Library Definitions of the [a manual with the abbreviation NETP].
#include <rpc/rpc.h>
int svc_fds;
Similar to
svc_fdset,
but limited to 32 descriptors. This
interface is obsoleted by
svc_fdset.
fd_set svc_fdset;
A global variable reflecting the
RPC
server's read file descriptor bit mask; it is suitable as a parameter
to the
select()
system call. This is only of interest
if a service implementor does not call
svc_run(),
but rather does their own asynchronous event processing.
This variable is read-only (do not pass its address to
select()!),
yet it may change after calls to
svc_getreqset()
or any creation routines.
bool_t svc_freeargs(xprt, inproc, in) SVCXPRT *xprt; xdrproc_t inproc; char *in;
Free any data allocated by the
RPC/XDR
system when it decoded the arguments to a service procedure
using
svc_getargs().
This routine returns
TRUE
if the results were successfully
freed,
and
FALSE
otherwise.
bool_t svc_getargs(xprt, inproc, in) SVCXPRT *xprt; xdrproc_t inproc; char *in;
Decode the arguments of an
RPC
request
associated with the
RPC
service transport handle,
xprt.
The parameter
in
is the address where the arguments will be placed;
inproc
is the
XDR
routine used to decode the arguments.
This routine returns
TRUE
if decoding succeeds, and
FALSE
otherwise.
struct sockaddr_in * svc_getcaller(xprt) SVCXPRT *xprt;
The approved way of getting the network address of the caller
of a procedure associated with the
RPC
service transport handle,
xprt.
void svc_getreq(rdfds) int rdfds;
Similar to
svc_getreqset(),
but limited to 32 descriptors. This interface is obsoleted by
svc_getreqset().
void svc_getreqset(rdfdsp) fd_set *rdfdsp;
This routine is only of interest if a service implementor
does not use
svc_run(),
but instead implements custom asynchronous event processing.
It is called when the
select()
system call has determined that an
RPC
request has arrived on some
RPC
socket(s) ;
rdfdsp
is the resultant read file descriptor bit mask.
The routine returns when all sockets associated with the
value of
rdfdsp
have been serviced.
void svc_run()
Normally, this routine only returns in the case of some errors.
It waits for
RPC
requests to arrive, and calls the appropriate service
procedure using
svc_getreq()
when one arrives. This procedure is usually waiting for a
select()
system call to return.
bool_t svc_sendreply(xprt, outproc, out) SVCXPRT *xprt; xdrproc_t outproc; char *out;
Called by an RPC service's dispatch routine to send the results of a remote procedure call. The parameter xprt is the request's associated transport handle; outproc is the XDR routine which is used to encode the results; and out is the address of the results. This routine returns TRUE if it succeeds, FALSE otherwise.
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Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97