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Fix cygwin's GNU screen /tmp/uscreens permission errors

Note: The latest Cygwin release of screen works fine now.

The current (e.g., 4.3.1) GNU screen command generally fails to work correctly on cygwin due to directory permission checks - for example, on /tmp/uscreens. To remedy this problem, you can run mkpasswd / mkgroup for every Windows user that runs cygwin. But this isn't foolproof because /tmp can easily become unusable by screen. Or you can modify screen and avoid the checks entirely. Here's how.

1. Run cygwin's setup program and install:
  • Source for the screen package
  • gcc
  • libncurses-devel
2. After installing, run the cygwin prompt
3. cd /usr/src
4. tar -xzf screen*.gz
5. cd screen-*
6. ./configure
7. Edit Makefile

  • change the line ETCSCREENRC = to ETCSCREENRC = /etc/screenrc

8. Edit screen.c. See [1] for more details. Remove the statements that start with:
    1. if (((int)st.st_mode & 0777) != n) ...
    2. if ((st.st_mode & 0777) != 0700) ...
    3. if ((int)st.st_uid != real_uid)
    4. if ((int)st.st_uid != multi_uid)
9. make
10. cp screen /bin

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