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Finally, this source uses the inetd superserver to create a simple network server that will echo
any characters received back to the client. This can be demonstrated by telnetting into the host
board and typing some characters.
// echo.c
//
// All this file does is echo any data written to its standard
// input to it’s standard output. If run from the commandline
it
// will echo typed characters. If you add this line to your
// /etc/inetd.conf file
//
// 24 root tcp nowait /path/to/echo
//
// And then try to telnet to port 24 of your dimmPCI develop-
ment
// board it will echo any charcters sent via the telnet
// connection.
#include <unistd.h>
#include <stdio.h>
int main (void)
{
char c;
while (read (fileno (stdin), &c, 1) >= 0) {
write (fileno (stdout), &c, 1);
}
return 0;
}