[lkml]   [2001]   [Aug]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Fw: select(), EOF...
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 <>

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:57    [W:0.061 / U:1.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site