The explain_setsockopt_or_die function is used to call the setsockopt(2) system call. On failure an
explanation will be printed to stderr, obtained from explain_setsockopt(3), and then the process
terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
explain_setsockopt_or_die(fildes, level, name, data, data_size);
fildes The fildes, exactly as to be passed to the setsockopt(2) system call.
level The level, exactly as to be passed to the setsockopt(2) system call.
name The name, exactly as to be passed to the setsockopt(2) system call.
data The data, exactly as to be passed to the setsockopt(2) system call.
data_size
The data_size, exactly as to be passed to the setsockopt(2) system call.
Returns:
This function only returns on success. On failure, prints an explanation and exits.