#5 Snow Leopard 10.6.1: OK and Cancel not responding

[GnarfUser]

Hi,

I have been testing my maintenance scripts and I have found out that latest version of iHook does not fully work in Snow Leopard 10.6.1.

Latest version is 1.2.0, I guess?
Finder info on the latest iHook.app shows still 1.1.1?

While running scripts in 10.6.1 OK and/or Cancel buttons in iHook are not responding so there is no way to cancel or advance running iHook notification.

I have tested my scripts parallel in Mac OS X 10.5.8 on the same machine and OK and Cancel respond correctly.

Could the developer please verify this problem and hopefully release an new updated version of iHook with 10.6 compatibility.

Thanks,

GnarfUser

[Andrew Yarmola]

Hi,

This problem is the result of the new lib_dispatch in 10.6 (Grand Central Dispatch). There is a bug in lib_dispatch where a processes created with execve() on a global dispatch queue (the way iHook tuns a script) does not receive some signals. The cancel button in iHook sends the script process a SIGTERM, which that process never receives.

A work around we came up with involves moving away from using NSOperationQueue (which uses global dispatch queues in 10.6) and using a POSIX thread. This edit is just a few lines in the code. A patch file is posted in the "Does iHook work in Snow Leopard" page in the Help topic (https://sourceforge.net/projects/ihook/forums/forum/829203/topic/3436157).

The Best,

Andrew Yarmola
Stanford University
Academic Computing Services