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Re: GNU coreutils does not work on Cygwin because of freopen() ?


Larry Hall (Cygwin) wrote:
dazjorz wrote:
Hey all,

I'm not very great with the inner workings of GNU or Cygwin libc, so please bear with me if I make any mistakes or misunderstandings.

I was trying to get GNU coreutils to work on Cygwin. Maybe this seems weird to you guys, because Cygwin has coreutils, but there are a few reasons:
- Cygwin didn't have md5sum, GNU coreutils did (and I need md5sum)

<http://cygwin.com/cgi-bin2/package-grep.cgi?grep=bin%2Fmd5sum>


Did you miss this?

Hmm. I guess. Oh well, I didn't have md5sum before, I think :/


- It should work, and "Because I Can" is always a valid reason in UNIX world
- I'm trying to bootstrap Debian on Cygwin, and coreutils from Debian is my first try; getting coreutils from Cygwin may be done later.


However, I noticed there are some very weird bugs happening. See for example, this bug in cat (don't look at the title of the page, I blamed bash first)
http://paster.dazjorz.com/?p=3845

Your example works fine for me with the latest coreutils. Perhaps you're working with a buggy locally built version?


Did you try with Cygwin coreutils or GNU coreutils? :)


By the way, list, I've been looking for some other things. This problem is caused by:
- cat calling freopen to make the handle binary (shouldn't it be binary in the first place? shouldn't it check if it's already opened in binary mode?)
- freopen() not checking if O_APPEND is set, etc. (is it possible to check this?)


I'll write a test case for freopen(), that shows O_APPEND is being missed, causing this bug.

Sjors

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