Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753069AbZGCHkj (ORCPT ); Fri, 3 Jul 2009 03:40:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752216AbZGCHkc (ORCPT ); Fri, 3 Jul 2009 03:40:32 -0400 Received: from qw-out-2122.google.com ([74.125.92.26]:31809 "EHLO qw-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751709AbZGCHkb convert rfc822-to-8bit (ORCPT ); Fri, 3 Jul 2009 03:40:31 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=M921dwhshht7vow2+IHppa7oUFkDRPzO9/Zxmomv+aMYgkvEXRNvAWDTMnse7iC1X4 d+6CulEiDcYTHmGeOM2DLgRs07SAKKkLUpIc8c4gDDtI9ZtyaOsQEmHX4SCGcfy+4lBL 2w+cmBAQKEQoGo+rdD55vwu1vT0+GBAKkgBnM= MIME-Version: 1.0 In-Reply-To: <20090703071504.GG5880@cr0.nay.redhat.com> References: <20090702094620.GE6372@cr0.nay.redhat.com> <20090702102138.GF6372@cr0.nay.redhat.com> <412e6f7f0907021743m6ed8ae10uecd13c4fc4ec7cbb@mail.gmail.com> <20090703015554.GB5880@cr0.nay.redhat.com> <412e6f7f0907021910w64af0525h17afb518f0e18f97@mail.gmail.com> <20090703030008.GD5880@cr0.nay.redhat.com> <412e6f7f0907022108p7c533ed2wd16fceb0f282ed62@mail.gmail.com> <20090703051917.GE5880@cr0.nay.redhat.com> <412e6f7f0907022242r52ad981fyd51c2a55f41ab228@mail.gmail.com> <20090703071504.GG5880@cr0.nay.redhat.com> Date: Fri, 3 Jul 2009 15:40:34 +0800 Message-ID: <412e6f7f0907030040v6133badat7058186a01d78f44@mail.gmail.com> Subject: Re: PROPOSAL: extend pipe() to support NULL argument. From: Changli Gao To: Amerigo Wang Cc: Linus Torvalds , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 918 Lines: 26 On Fri, Jul 3, 2009 at 3:15 PM, Amerigo Wang wrote: > > If saving one fd really helps here, probably you want to > save more, you will need a syscall like: > >  int splice_without_new_fd(int infd, int outfd); Do you know sendfile()? Its current implementation is buggy, and will be blocked on outfd. Anyway, the above code is just a use case, there are other cases sendfile can't cover. > > But splice(2) is designed to be as it is. You need to increase > your fd limit, instead of saving one by pipe(). > I don't agree with you. We should save resource as much as we can, and not work around it. -- Regards， Changli Gao(xiaosuo@gmail.com) -- 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/