[Python-Dev] End of the line

[M.-A. Lemburg]

Tim Peters wrote:
> 
> Anyone know offhand if there's a reliable way to determine whether an open
> file descriptor (a C FILE*) is seekable?

I'd simply use trial&error:

if (fseek(stream,0,SEEK_CUR) < 0) {
	if (errno != EBADF)) {
		/* Not seekable */
		errno = 0;
	}
	else
		/* Error */
		;
}
else
	/* Seekable */
	;

How to get this thread safe is left as exercise to the interested
reader ;)

Cheers,
-- 
Marc-Andre Lemburg
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