Тестовые примеры / ch12 / call_back / aclk_cls

#include <netconfig.h>
#include "aclock.h"
#include "RPC.h"

RPC_svc *svcp = 0;

#define CLNTPROGNUM 0x20000105

int callback( SVCXPRT* xtrp )
{
    u_long timv;
    if (svcp->getargs( xtrp, (xdrproc_t)xdr_u_long, (caddr_t)&timv)!=RPC_SUCCESS)
    {
       cerr << "client: get alarm time fails\n";
       return -1;
    }
    cerr << "client: alarm time left is: " << timv << endl;

    if (svcp->reply(xtrp, (xdrproc_t)xdr_void, 0)!=RPC_SUCCESS) 
    {
       cerr << "client: send reply failed\n";
       return -2;
    }
    /* do work */
    exit(0);
}

/* register a call back with a RPC server */
int register_callback( char* local_host, char* svc_host, u_long alarm_time)
{
    struct arg_rec argRec;

    /* tell remote server the process's hotsname, prog no, vers. no,  proc. no, 
       and the alarm time
    */
    argRec.hostname = local_host;
    argRec.prognum  = svcp->progno();
    argRec.versnum  = CLNTVERNUM;
    argRec.procnum  = CLNTPROCNUM;
    argRec.atime    = alarm_time;  

    RPC_cls clnt( svc_host, ACLKPROG, ACLKVER, "netpath");
    if (!clnt.good()) return 1;
    
    if (clnt.call( ACLKPROC, (xdrproc_t)xdr_arg_rec, (caddr_t)&argRec, 
                      (xdrproc_t)xdr_void, (caddr_t)0 ) !=RPC_SUCCESS) {
       return 2;
    }
    cerr << "client: " << getpid() <<": RPC called done\n";
    return 0;
}

/* client main function */
int main (int argc, char* argv[])
{
    if (argc!=4) {
       cerr << "usage: " << argv[0] << " <local-host> <svc-host> <transport>\n";
       return 1;
    }

    /* create a server object to receieve call back from a remote server */
    if (!(svcp= new RPC_svc( CLNTPROGNUM, CLNTVERNUM, argv[3] )))
       return 2;

    svcp->add_proc( CLNTPROCNUM, callback );  // define the callback function

    /* register the callback with a remote server */
    if (register_callback( argv[1], argv[2], 10)) return 3;

    /* do work here .... */

    svcp->run(); /* wait for alarm to expire */
    return 0;
}