Date: Thu, 14 Feb 2019 10:50:31 +0100 From: Christian Barthel <bch@online.de> To: freebsd-chat@freebsd.org Subject: siginfo_t content Message-ID: <875ztmitqw.fsf@x230.onfire.org>
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Hello,
I am interested in the historical development of the siginfo_t
record. I hope, this is the correct mailinglist and there are
still readers on it.
I've tried to write a very simple and minimalistic profiler for a
single threaded application by using setitimer(2) and SIGPROF
signal. When using the extended signal handler code described in
the EXAMPLES section of sigaction(2), I can access the faulting
code and the type of the signal by using `struct siginfo`:
File: <sys/signal.h>
struct siginfo_t *info {
....
int si_code; /* signal code */
void *si_addr; /* faulting instruction */
....
}
I've noticed that the si_code is always set to be SI_KERNEL and
the si_addr to be 0x0. Is there a specific reason for this?
I thought that the SIGPROF signal would be of type SI_TIMER.
After reading through the kernel sources, I've manipulated the
returned structure a bit and attached the patch to clarify what I
am meaning (I've just used the program counter of the first
thread which is not correct if there are multiple threads).
Kind regards,
--
Christian Barthel <bch@online.de>
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