On Nov 11, 2006, at 10:55 AM, Wenyen, Shih wrote:
Hi all, I have some questions. (1) I know how to delivery of a signal to a process.1. The kernel places a signal context on the user's stack.(user level) 2. The kernel places a signal-handler frame on the user's stack.(kernel level) 3. The user's signal handler returns to the sigtramp() routine, which pops the signal-handler context from the user's stack.(user level) 4. The sigtramp() routine finishes by calling the sigreturn system call. But, why don't implement signal handler routine in kernel level? Are there having any ideas to implement signal handler routine in kernel level? (2) The system-call exit code first checks for a posted signal and check to see whether any process has a priority higher than that of the currently running process. But, I don't know the signal be checked when returning from kernel mode to user mode. Anyone have any other methods to checked the signal in the other occasion ? Thanks, Wenyen
I would suggest asking this question on the freebsd-hackers list. -Garrett _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
