Hello,
The observation and hence the question that I asked was wrong in first place.
Anyone who might have read it might have gained a notion that the signal is always delivered to the main thread. I confirmed that when we use the kill command from the shell, it is actually going to the <pid-of-thread> from sys_kill !
I have still not explored who handles that signal @ user space, is it always the main thread -OR- as per standards, a dedicated thread from application should handle the signal.
Thanks,
Peyush
-----Original Message-----
From: kernelnewbies-bounce@xxxxxxxxxxxx on behalf of Peyush Marwaha
Sent: Sun 3/13/2005 8:43 PM
To: kernelnewbies@xxxxxxxxxxxx
Cc:
Subject: Signals to threads
Hi,
I am working on RH9 with kernel 2.4.20-31.9smp
I have a process "A" spawning thread "B". (using pthreads)
ps -aefm | grep "A" gives me two pids, one of "A" and one of "B"
When I send a signal to pid-B, it is actually delivered to "A". (I know this because I have my hook in sys_kill)
Is this always the case ? Can I not send a signal directly to a thread (not the main thread) ?
If there is some transformation of converting and sending the signal to thread group leader, who does this transformation ? Kernel ? Libc ? shell ? ....
Please assist.
Thanks,
Peyush
