clnt_spcreateerror - Linux


clnt_spcreateerror is a command-line tool used to create a Server-Per-Connection (SPC) error service. This service allows RPC applications to handle specific errors within their own processes, providing finer-grained control and customization over error handling.


clnt_spcreateerror [options] <transport> <prog> <vers> <proc>


  • -s: Server hostname
  • -p: Server port number (default: 0, auto-assigned)
  • -t: Transport type (e.g., tcp, udp)
  • -u: RPC protocol version (default: 1)
  • -R: Request number
  • -e: Error number
  • -a: Auxiliary string
  • -c: Callback function
  • -f: Use foreground instead of background mode
  • -n: Use non-blocking I/O


Create a SPC error service for RPC program 1, version 1, procedure 2 with error 5 and auxiliary string "My error":

clnt_spcreateerror -t tcp -p 6000 -R 1 -e 5 -a "My error" 1 1 2

Create a non-blocking SPC error service using foreground mode:

clnt_spcreateerror -t udp -n -f 1 1 2

Common Issues

  • Permission denied: Ensure you have proper permissions to create a SPC error service.
  • Invalid arguments: Verify that all provided arguments, such as transport type, program, version, and procedure, are valid.
  • Service already exists: Avoid creating multiple instances of the same SPC error service.


clnt_spcreateerror can be combined with other RPC commands and tools to enhance error handling. For example, it can be used with clnt_call to specify error handling callbacks during RPC calls.

Related Commands

  • rpcgen: Generates C code for RPC programs
  • rpcinfo: Displays information about RPC programs and services
  • clnt_call: Invokes RPC procedures on a remote host