The example below shows a simple server for a service called "echo" that provides a single function named echo.

This function accepts an argument, and responds with a copy of the request.

#include <err.h>
#include <stdlib.h>
#include <string.h>

#include <ipc.h>

/* Take a line of input and copy it to the output */
char *
echo(const char *input)
{
	return (strdup(input));
}

int main(int argc, char *argv[]) 
{
	int result;

	result = ipc_server_main(IPC_DOMAIN_USER, "echo");
	if (result < 0)
		errx(1, "ipc_server_main: %s", ipc_strerror(rv));
	
	exit(EXIT_SUCCESS);
}

The ipc_server_main starts an IPC server for the local user, and binds to the "echo" service. It will run in a loop servicing client requests.