rpc_broadcast_exp Subroutine

Purpose

Invokes the remote procedure associated with specified program and version by broadcasting the call message through all connectionless transports of the specified class with initial wait time and the maximum wait-time constraints.

Library

Network Services Library (libnsl.a)

Syntax

#include <rpc/rpc.h>
enum clnt_stat rpc_broadcast_exp(prognum, versnum, procnum, in_proc, input, out_proc, output, 
result, itime, wtime, nettype)
const rpcprog_t prognum;
const rpcvers_t versnum;
const rpcproc_t procnum;
const xdrproc_t in_proc;
caddr_t input;
const xdrproc_t out_proc;
caddr_t output;
const resultproc_t result;
const int itime;
const int wtime;
const char *nettype;

Description

The rpc_broadcast_exp subroutine calls the remote procedure associated with the specified program and version. When calling the procedure, the subroutine broadcasts the call message through all connectionless transports of the specified class. You can specify an eXternal Data Representation (XDR) procedure that encodes the procedure parameters along with the address of the parameters. Similarly, you can specify an XDR procedure that decodes the procedure results along with the address where those results are to be placed. Every time the rpc_broadcast_exp subroutine receives a response, the subroutine calls the following subroutine: 
 bool_t result(caddr_t output, const struct netbuf *addr, const struct netconfig *nconf);
The output parameter of the subroutine is the same as that of the rpc_broadcast_exp subroutine. The addr parameter holds the address of the machine that sent the results. The nconf parameter specifies the transport used by the machine to respond. You can specify the initial time before the request is resent in milliseconds. Similarly, after the request is resent for the first time, the retransmission interval increases exponentially until it exceeds the maximum value that you can also specify in milliseconds. If the result subroutine returns a value of 0, the rpc_broadcast_exp subroutine waits for more replies. Otherwise, the subroutine returns with an appropriate status.

Parameters

Item Description
prognum Specifies the program number of the remote program.
versnum Specifies the version number of the remote program.
procnum Specifies the remote procedure number.
in_proc Specifies the XDR procedure for encoding the procedure parameters.
input Specifies the address of the procedure arguments.
out_proc Specifies the XDR procedure for decoding the procedure results.
output Specifies the address where the results will be placed.
result Specifies the subroutine that is invoked when the rpc_broadcast_exp receives a response.
itime Specifies the initial timeout before the request is resent.
wtime Specifies the maximum timeout.
nettype Defines a class of transports which can be used for a particular application.

Return Values

The rpc_broadcast_exp subroutine returns failure when one or more of the following codes are true.

Item Description
RPC_UNKNOWNPROTO
  • The value of the nettype parameter is not valid.
  • The value of the nettype parameter is set to netpath, and the NETPATH environment variable is set to a transport service that is not valid.
RPC_TIMEDOUT
  • The timeout value has expired.
  • The specified version is not registered at the server.
  • The remote procedure is not available.
RPC_PROGVERSMISMATCH The specified version is not registered at the server.
RPC_FAILED An unspecified error occurred. The procedure specified by the in_proc or out_proc parameter might not be valid.
RPC_CANTDECODEARGS The arguments or results are not valid.
RPC_SYSTEMERROR All of the process memory is exhausted (heap).

Examples

#include <rpc/rpc.h>

bool_t result(caddr_t output, const struct netbuf *addr, const struct netconfig *nconf)
{
    /* result() subroutine code */
}

int main()
{
    rpcprog_t program_number = 0x3fffffffL;
    rpcvers_t version_number = 0x1L;
    rpcproc_t procedure_number = 0x1L;
    enum clnt_stat cs ;    
    char *nettype = "visible";
    const int itime = 5 ;
    const int wtime = 25 ;
    cs = rpc_broadcast_exp( program_number, version_number, procedure_number, 
                       (xdrproc_t)xdr_void, NULL,(xdrproc_t)xdr_void, NULL, 
                        result, itime, wtime, nettype);
    if (cs != RPC_SUCCESS)
    {
       fprintf(stderr,"\n RPC Call failed\n");
       exit(1);
    }
    return 0;
}