text / binary mounts (sorry)

Chris Faylor cgf@cygnus.com
Fri Jun 2 19:33:00 GMT 2000


On Fri, Jun 02, 2000 at 05:35:29PM -0400, David Bolen wrote:
>Earnie Boyd [earnie_boyd@yahoo.com] writes:
>>Are you sure of this, Ron?  AFAIK CYGWIN=binmode only affects the pipes
>>and redirection and not file I/O.  BTW CYGWIN=binmode is the default.
>
>One minor caveat with respect to "default" - the default behavior for
>the stdin/stdout handles changed from b20.1 to the net releases,
>dependent on whether you explicitly had the environment variable or
>not.  If you put CYGWIN=binmode in your environment it also affects
>stdin/stdout default behavior, but if you leave the variable out they
>will default to text mode and not binary.

It only affects stdin/stdout behavior when the program is run from the
Windows command shell.

>It's my understanding this was done for some issues with interactive
>tool use, but unfortunately it also comes into play when utilities
>fork() a copy of themselves to process data on stdin/stdout (I ran into
>this with the rsync utility).

I'm not sure how this could be.  Reading the code, I see this line right
before the part that sets the stdin/stdout based on CYGWIN=binmode.

  if (!parent_alive && NOTSTATE(myself, PID_CYGPARENT))

fork() is a cygwin function which produces an additional copy of a running
program.  That means that the child has a a cygwin parent and so stdin should
be in the same state in the child as in the parent.

cgf

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