* sys_poll/do_poll/f_op->poll
@ 2006-03-02 7:16 Shaya Potter
2006-03-02 8:09 ` sys_poll/do_poll/f_op->poll Jamie Lokier
0 siblings, 1 reply; 3+ messages in thread
From: Shaya Potter @ 2006-03-02 7:16 UTC (permalink / raw)
To: linux-fsdevel
am I missing something or do none of the in kernel file system use this
code (and would therefore sys_poll() not work on them?)
I figure I'm probably blind to something obvious, just unsure what it
is.
thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: sys_poll/do_poll/f_op->poll
2006-03-02 7:16 sys_poll/do_poll/f_op->poll Shaya Potter
@ 2006-03-02 8:09 ` Jamie Lokier
2006-03-02 8:47 ` sys_poll/do_poll/f_op->poll Shaya Potter
0 siblings, 1 reply; 3+ messages in thread
From: Jamie Lokier @ 2006-03-02 8:09 UTC (permalink / raw)
To: Shaya Potter; +Cc: linux-fsdevel
Shaya Potter wrote:
> am I missing something or do none of the in kernel file system use this
> code (and would therefore sys_poll() not work on them?)
sys_poll() is _required_ by tradition and standards
to return (at least) POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM
for regular files.
That's why there are no poll operations for files in any filesystem.
-- Jamie
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: sys_poll/do_poll/f_op->poll
2006-03-02 8:09 ` sys_poll/do_poll/f_op->poll Jamie Lokier
@ 2006-03-02 8:47 ` Shaya Potter
0 siblings, 0 replies; 3+ messages in thread
From: Shaya Potter @ 2006-03-02 8:47 UTC (permalink / raw)
To: Jamie Lokier; +Cc: linux-fsdevel
On Thu, 2006-03-02 at 08:09 +0000, Jamie Lokier wrote:
> Shaya Potter wrote:
> > am I missing something or do none of the in kernel file system use this
> > code (and would therefore sys_poll() not work on them?)
>
> sys_poll() is _required_ by tradition and standards
> to return (at least) POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM
> for regular files.
>
> That's why there are no poll operations for files in any filesystem.
and I wasn't thinking right either, poll would generally be used for a
place where read/write would block indefintely, which i guess is "never"
for a regular file ("never" in quotes as not literally true, but when
compared to a socket or a pipe).
strange that at 4am I realized what at midnight I didn't :)
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2006-03-02 8:48 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2006-03-02 7:16 sys_poll/do_poll/f_op->poll Shaya Potter
2006-03-02 8:09 ` sys_poll/do_poll/f_op->poll Jamie Lokier
2006-03-02 8:47 ` sys_poll/do_poll/f_op->poll Shaya Potter
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