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Date:      Sun, 18 Sep 2011 14:54:34 +0300
From:      Mikolaj Golub <trociny@freebsd.org>
To:        "Ronald Klop" <ronald-freebsd8@klop.yi.org>
Cc:        "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, Jeremy Chadwick <freebsd@jdc.parodius.com>, cperciva@freebsd.org
Subject:   Re: /usr/bin/script eating 100% cpu with portupgrade and xargs
Message-ID:  <868vpmdq11.fsf@kopusha.home.net>
In-Reply-To: <op.v1z4ooot8527sy@pinky> (Ronald Klop's message of "Sun, 18 Sep 2011 13:25:26 %2B0200")
References:  <op.v1y8gdtf8527sy@pinky> <20110918045413.GA63773@DataIX.net> <20110918053901.GA31617@icarus.home.lan> <op.v1zrszht8527sy@pinky> <86d3eydsmf.fsf@kopusha.home.net> <op.v1z4ooot8527sy@pinky>

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On Sun, 18 Sep 2011 13:25:26 +0200 Ronald Klop wrote:

 RK> It is a while since I programmed C, but why will writing 0 bytes give
 RK> the reader an end-of-file? Shouldn't the fd be closed to indicate
 RK> end-of-file?

AFAIR, this trick with writing 0 to emulate EOF because we can't close the fd
-- we still want to read from it.  Poor shutdown(2) for non-socket :-).

Colin might tell more...

-- 
Mikolaj Golub



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