From: Shaya Potter <spotter@cs.columbia.edu>
To: Jamie Lokier <jamie@shareable.org>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: sys_poll/do_poll/f_op->poll
Date: Thu, 02 Mar 2006 03:47:03 -0500 [thread overview]
Message-ID: <1141289223.1557.2.camel@localhost.localdomain> (raw)
In-Reply-To: <20060302080930.GA20193@mail.shareable.org>
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 :)
prev parent reply other threads:[~2006-03-02 8:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
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 ` Shaya Potter [this message]
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