From: H. Peter Anvin <hpa@zytor.com>
Date: Sun, 04 Jun 2006 18:25:30 GMT
Subject: Re: Clean up sha1 file writing
Message-ID: <4483259A.7090806@zytor.com>
In-Reply-To: <Pine.LNX.4.64.0606021416040.5498@g5.osdl.org>

Linus Torvalds wrote:
> 
> On Fri, 2 Jun 2006, H. Peter Anvin wrote:
>> Linus Torvalds wrote:
>>> Any POSIX-conformant OS/filesystem should always do a full write for a
>>> regular file, unless a serious error happens.
>>>
>> Actually, at least Linux won't, if the object is larger than 2 GB on a 64-bit
>> system :)
> 
> Yeah, true.
> 
> In the end, you should always have the loop. That way, you never have to 
> worry about what kind of file descriptor it is, what kind of filesystem 
> you're running on, and what the limits of ssize_t might be.
> 

Or if you're getting a SIGWINCH in the middle of it.

Any POSIX system will interrupt the transfer and return a short read on 
receiving a signal.

	-hpa