getrpcbyname_r - Linux
Overview
getrpcbyname_r
is used to retrieve information about a RPC service based on its name, program number, protocol, or version number. It is a thread-safe version of getrpcbyname
.
Syntax
int getrpcbyname_r(const char *name, struct rpc_service *result, char *buffer, size_t buflen, struct rpc_service **res);
Options/Flags
The following options are supported:
name
: The name of the RPC service to be queried.result
: The RPC service structure to be filled with the retrieved information.buffer
: A buffer to store the RPC service name.buflen
: The size of the buffer provided.res
: A pointer to the RPC service structure.
Examples
To retrieve information about the RPC service named "rpcbind":
#include <rpc/rpc.h>
int main() {
struct rpc_service service;
char buffer[1024];
struct rpc_service *result;
if (getrpcbyname_r("rpcbind", &service, buffer, sizeof(buffer), &result) != 0) {
perror("getrpcbyname_r");
return 1;
}
printf("RPC service name: %s\n", service.rs_name);
printf("RPC program number: %d\n", service.rs_number);
printf("RPC protocol: %d\n", service.rs_proto);
printf("RPC version number: %d\n", service.rs_vers);
return 0;
}
Common Issues
- The program doesn’t terminate: Ensure that the
buffer
provided is large enough to store the RPC service name. - The program returns an error: Check the error code returned by
getrpcbyname_r
to determine the cause of the error. Common error codes include:RPC_SUCCESS
: The function succeeded.RPC_CANTENCODEARGS
: The arguments could not be encoded.RPC_CANTDECODEARGS
: The arguments could not be decoded.RPC_CANTRECV
: The RPC server could not be reached.RPC_CANTDECODERES
: The RPC response could not be decoded.
Integration
getrpcbyname_r
can be used with other RPC-related commands, such as rpcinfo
and rpcgen
. It can also be used with the getaddrinfo
function to retrieve the network address of an RPC service.
Related Commands
getrpcbynumber_r
getrpcbyport_r
rpcinfo
rpcgen
getaddrinfo