[repost] Patch to make cpdup's stdout unbuffered

[Matthew Dillon]

:Now, we could add a flag for every single program to write unbuffered 
:(linebuffered) output. Or we could do some (non-POSIX?) magic in libc 
:to get most of this just fixed by doing a env 
:LIBC_STDOUT_BUFFERING=line $program or whatever...
:
:opinions about this?
:
:cheers
:   simon
 
    Say what?  No, we are not hacking up libc to turn off buffering in some
    magic way.  Buffering is what you want for the vast, vast majority
    of programs that are run from the command line.  We certainly are not
    going to add yet another environment variable that libc has to check
    every time a program is started up.

    Just add an option to cpdup that calls setvbuf() on stdout.

						-Matt