void explain_fgetpos_or_die(FILE *fp, fpos_t *pos);
int explain_fgetpos_on_error(FILE *fp, fpos_t *pos);
DESCRIPTION
The explain_fgetpos_or_die function is used to call the
fgetpos(3) system call. On failure an explanation will be printed
to stderr, obtained from the explain_fgetpos(3) function,
and then the process terminates by calling exit(EXIT_FAILURE).
The explain_fgetpos_on_error function is used to call the
fgetpos(3) system call. On failure an explanation will be printed
to stderr, obtained from the explain_fgetpos(3) function,
but still returns to the caller.
fp
The fp, exactly as to be passed to the fgetpos(3) system call.
pos
The pos, exactly as to be passed to the fgetpos(3) system call.
RETURN VALUE
The explain_fgetpos_or_die function only returns on success, see
fgetpos(3) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_fgetpos_on_error function always returns the value
return by the wrapped fgetpos(3) system call.
EXAMPLE
The explain_fgetpos_or_die function is intended to be used in a
fashion similar to the following example: