From: "Russ Cox" <rsc@swtch.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@9fans.net>
Subject: Re: [9fans] Why do we need syspipe() ?
Date: Sat, 3 Jan 2009 22:56:56 -0800 [thread overview]
Message-ID: <dd6fe68a0901032256i7a40c196odcc522a35202caea@mail.gmail.com> (raw)
In-Reply-To: <1231045486.11463.245.camel@goose.sun.com>
On Sat, Jan 3, 2009 at 9:04 PM, Roman V. Shaposhnik <rvs@sun.com> wrote:
> I'm confused. Is there any part of syspipe() that can NOT
> be done from userspace? Why does it have to be a syscall?
>
> P.S. I would also argue that sysdup() would seem to be superfluous
> if more feature-rich devdup was available.
I don't believe you can write a race-free implementation of
the pipe system call using #|.
I also don't believe you can implement the dup system call
(remember, it has two arguments) using #d.
If you disagree, show me the code.
Russ
next prev parent reply other threads:[~2009-01-04 6:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-04 5:04 Roman V. Shaposhnik
2009-01-04 6:56 ` Russ Cox [this message]
2009-01-05 4:39 ` Roman V. Shaposhnik
2009-01-05 6:20 ` Russ Cox
2009-01-05 7:28 ` lucio
2009-01-05 11:00 ` roger peppe
2009-01-08 23:36 ` Roman V. Shaposhnik
2009-01-06 17:40 ` Nathaniel W Filardo
2009-01-06 20:37 ` Charles Forsyth
2009-01-06 23:13 ` Roman V. Shaposhnik
2009-01-06 23:15 ` erik quanstrom
2009-01-08 23:45 ` Roman V. Shaposhnik
2009-01-08 23:48 ` erik quanstrom
2009-01-09 2:05 ` Roman V. Shaposhnik
2009-01-09 12:54 ` roger peppe
2009-01-07 3:48 ` lucio
2009-01-07 7:00 ` Roman Shaposhnik
2009-01-07 9:31 ` Charles Forsyth
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