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Date:      Fri, 23 Jun 2000 10:07:37 -0700 (PDT)
From:      FengYue <fengyue@bluerose.windmoon.nu>
To:        "Bohne, Peter" <Peter.Bohne@hboc.com>
Cc:        "'andrew@ugh.net.au'" <andrew@ugh.net.au>, hackers@FreeBSD.ORG
Subject:   RE: libc_r/_read(), should the errno be reset to 0?
Message-ID:  <Pine.BSF.4.10.10006231005010.36739-100000@bluerose.windmoon.nu>
In-Reply-To: <35BEC7ED0A15D21199F000805F6F6D6A01CB00E0@bldexc01ntms.clinicom.com>

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Wait, that's not going to do anything, the errno is set inside the
_thread_sys_read().  But I agree with Andrew, why bother to check
errno if read() returns no error.

On Fri, 23 Jun 2000, Bohne, Peter wrote:

> This means that *you* should set errno to 0 just before you do the read
> call.  At this point, you no longer care what it had been before.
> --
> pete
> 
> ====== pbohne at hboc dot com
> Peter Bohne -- McKessonHBOC -- Louisville, CO
> Work: 303-926-2218 -- Cell: 303-817-8312 -- Home Ofc: 970-586-9031
> ====== "Very funny, Scottie.  Now beam down my clothes!"
> 
> 
> 
> > -----Original Message-----
> > From: andrew@ugh.net.au [mailto:andrew@ugh.net.au]
> > Sent: Friday, June 23, 2000 3:02 AM
> > To: FengYue
> > Cc: hackers@FreeBSD.ORG
> > Subject: Re: libc_r/_read(), should the errno be reset to 0?
> > 
> > 
> > 
> > 
> > On Fri, 23 Jun 2000, FengYue wrote:
> > 
> > > My question is, shouldn't it be reset to zero?
> > 
> > From intro(2):
> > 
> > Successful calls never set errno; once set, it remains until 
> > another error
> > occurs.  It should only be examined after an error.
> > 
> > Andrew
> > 
> > 
> > 
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-hackers" in the body of the message
> > 



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