The explain_fwrite_or_die function
is used to call the fwrite(3) system
call. On failure an explanation will be
printed to stderr,
obtained from explain_fwrite(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:
size_t result = explain_fwrite_or_die(ptr, size, nmemb, fp);
ptr
The ptr, exactly as to be passed to the fwrite(3) system call.
size
The size, exactly as to be passed to the fwrite(3) system call.
nmemb
The nmemb, exactly as to be passed to the fwrite(3) system call.
fp
The fp, exactly as to be passed to the fwrite(3) system call.
Returns:
This function only returns on success.
On failure, prints an explanation and exits.