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Page 28 Remote Procedure Call Programming Guide

5.2. TCP

Here is an example that is essentially rcp. The initiator of the RPC snd call takes its standard input and

sends it to the server rcv which prints it on standard output. The RPC call uses TCP. This also illustrates

an XDR procedure that behaves differently on serialization than on deserialization.

* The xdr routine:

* on decode, read from wire, write onto fp

* on encode, read from fp, write onto wire

#include <stdio.h>

#include <rpc/rpc.h>

xdr_rcp(xdrs, fp)

XDR *xdrs;

FILE *fp;

{

unsigned long size;

char buf[BUFSIZ], *p;

if (xdrs->x_op == XDR_FREE)/* nothing to free */

return 1;

while (1) {

if (xdrs->x_op == XDR_ENCODE) {

if ((size = fread(buf, sizeof(char), BUFSIZ,

fp)) == 0 && ferror(fp)) {

fprintf(stderr, "can’t fread\n");

return (1);

}

p = buf;

if (!xdr_bytes(xdrs, &p, &size, BUFSIZ))

return 0;

if (size == 0)

return 1;

if (xdrs->x_op == XDR_DECODE) {

if (fwrite(buf, sizeof(char), size,

fp) != size) {

fprintf(stderr, "can’t fwrite\n");

return (1);

}

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RPC -WR5441 Specifiche Pagina 28