clnt_create - Linux
Overview
The clnt_create
command is a core function within Sun’s RPC (Remote Procedure Call) library, used for creating a client handle for remote procedure calls. It establishes a connection with a server and allows the client to make remote procedure calls to that server.
Syntax
clnt_create(const char* host, u_long prog, u_long vers, const char* proto)
Options/Flags
- host: Specifies the hostname or IP address of the server to connect to.
- prog: The program number of the RPC service on the server.
- vers: The version number of the RPC service on the server.
- proto: The protocol to use for the RPC connection. Valid options include "tcp" and "udp".
Examples
Simple Example: Create a client handle to the rpcbind
service on the remote host example.com
:
clnt_create("example.com", RPCBINDPROGRAM, RPCBINDVERSION, "tcp");
Advanced Example: Create a client handle to the nfs
service on the remote host 192.168.1.100
using UDP:
clnt_create("192.168.1.100", NFS_PROGRAM, NFS_VERSION, "udp");
Common Issues
- Connection refused: Ensure that the RPC service is running on the server and that the hostname or IP address is correct.
- RPC protocol not supported: Verify that the protocol specified in the
proto
argument is supported by the server. - RPC program or version not found: Confirm that the program number and version number provided are valid for the RPC service on the server.
Integration
The client handle created by clnt_create
can be used with other RPC library functions, such as clnt_call
and clnt_destroy
, to make remote procedure calls and manage the RPC connection.
Related Commands
clnt_call
: Makes a remote procedure call using a client handle created byclnt_create
.clnt_destroy
: Destroys a client handle, closing the RPC connection.rpcinfo
: Provides information about RPC services on remote hosts.