On Mon, 20 Aug 2001, Carlos Fernández Sanz wrote:
> (sorry if this is a dupe, I haven't seen it come from the list, so I'm
> resending as plain ASCII in case majordomo kills messages with strange
> stuff)
>
> Hi,
>
> I need to do something similar to tail -f.
> I was hoping that select() or poll() would block my process after reaching
> EOF but (as the man says) EOF doesn't cause read() to block so select() and
> poll() both say I can read. The result is (obviously) that my program waits
> actively and uses all the CPU.
> What's the right way of doing this? I assume the kernel provides facilities
> to find out if there is new data to read (other than EOF).
>
> Thanks.
tail -f just alternates between open() and close(), keeping in memory the
current byte offest into the file.
-- Ignacio Vazquez-Abrams <ignacio@openservices.net>- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Aug 23 2001 - 21:00:37 EST