BUG: "Can't set selection" error in emacs when emacs started from remote shell

[vincent-opdarw@…]

When I run emacs (from the emacs-devel port) in an environment where the SECURITYSESSIONID variable isn't set (this can happen when emacs is started from the screen utility), copy-paste between emacs and other applications fails. For instance, when I click with the middle button to paste in emacs, I get the error "Kill ring is empty".

[vincent-opdarw@…]

In fact the behavior is quite random. Sometimes it works. Sometimes it works only when the selection has been pasted first to Sticky. Strange...

[vincent-opdarw@…]

I'm changing the summary because this has nothing to do with SECURITYSESSIONID: even when set manually, I can get an error. To reproduce the problem:

1. Connect to the Mac OS X machine with ssh.
2. Start the "screen" utility.
3. Detach the screen session (and quit ssh).
4. Reattach the screen session from a Mac OS X terminal (in my case, iTerm).
5. Type /Applications/DarwinPorts/Emacs.app/Contents/MacOS/Emacs.
6. Type something in Emacs and select something.

In the messages, I get the error:

x-set-selection: Can't set selection

Copy-paste (with the mouse or the keyboard) works inside Emacs, but only inside Emacs, not with the other Mac OS X applications, i.e. the Mac OS X clipboard is not transmitted to Emacs, ditto for the other way round. Cutting a selection by double-clicking with the right mouse button doesn't work either.

My current active port: emacs-devel @22.0.50.1-20060622_2+atsui+carbon+darwin_8

[jmroot (Joshua Root)]

Closing: emacs-devel was removed in r33465.

[vinc17@…]

I'm reopening the bug since it applies to the emacs port too (not surprising, since this is the same software). I reproduced it with: emacs @22.2_1+atsui+carbon

[(none)]

Milestone Port Bugs deleted

[vinc17@…]

archive containing the dump files obtained with ktrace/kdump and the corresponding environment

[vinc17@…]

The bug still occurs with Emacs 22.3.1. The attachment kdump-mp6495.tar.lzma contains the dump files obtained with

  ktrace /Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs \
    -q -no-site-file -eval '(setq inhibit-splash-screen t)'

and kdump, and the corresponding environments. In the Emacs window, I typed "asd" and selected it with a double-click. Then I quit Emacs with C-x C-c.

*-fail when Emacs has been started from screen (see above).

*-ok when Emacs has been started from a normal iTerm tab.

In kdump-ok, the PID has been changed to the PID from kdump-fail in order to be able to do a "diff".

It seems that the main differences in the kdump files are the failures of shm_open in kdump-fail: "shm_open -1 errno 2 No such file or directory".