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Re: PIPE_BUF and read with SIZE < 0

From: Robert Millan
Subject: Re: PIPE_BUF and read with SIZE < 0
Date: Fri, 25 Apr 2003 12:26:01 +0200
User-agent: Mutt/1.5.4i

On Wed, Apr 23, 2003 at 05:50:49PM -0400, James A. Morrison wrote:
> On Wed, 2003-04-23 at 16:20, Robert Millan wrote:
> > - is the behaviour of read() undefined when the SIZE argument is a
> > negative value?
>  [...]
>  So, it can return a negative value, but size_t is, at least on
> GNU systems, unsigned.  So specifing -1 will give you a rather large
> value, perhaps even 2^32 - 1.

I don't understand that. If size_t is an unsigned int, and i try to pass it
a signed int, shouldn't the compiler require a cast? so that "(size_t) -1"
should bring 2^32-1 and "-1" should fail to compile?

sign conversions like that are dangerous, maybe i should file a wishlist
bug on gcc?

Robert Millan

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