On Sat, Nov 15, 2003 at 12:44:54PM +0000, David Sainty wrote:
> 
> Module Name:	src
> Committed By:	dsainty
> Date:		Sat Nov 15 12:44:54 UTC 2003
> 
> Modified Files:
> 	src/bin/dd: dd.c
> 
> Log Message:
> Avoid corrupting the dd(1) IO streams.  This would happen by accidentally
> outputting to the files being manipulated by opening a file in the standard IO
> descriptor space.  In particular, an output file unlucky enough to be sitting
> on descriptor 2 (stderr) is certain to be corrupted.
> 
> Addresses PR bin/8521, and passes the recently committed regression test
> "bin/dd".

What is wrong with:
	new_fd = fcntl(fd, F_DUPFD, 3);
	close(fd);
	fd = newfd;

	David

-- 
David Laight: david@l8s.co.uk