The explain_ferror_or_die function
is used to call the ferror(3) system
call. On failure an explanation will be
printed to stderr,
obtained from explain_ferror(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_ferror_or_die(fp);
It is essential that this function cal be placed as close as
possible to the I/O code that has caused the problem, otherwise
intervening code could have altered the errno global
variable.
fp
The fp, exactly as to be passed to the ferror(3) system call.
Returns:
This function only returns on success.
On failure, prints an explanation and exits.