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Date: Sat, 8 May 2010 14:15:09 +0300
From: Ali Polatel <alip@exherbo.org>
To: freebsd-hackers@freebsd.org
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Subject: Ability to tell the difference between normal and syscall traps
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Does FreeBSD's ptrace have a way to tell the difference between normal
traps and those caused by a system call?

On Linux=B9 this is possible by passing PTRACE_O_TRACESYSGOOD option to the
ptrace request PTRACE_SETOPTIONS which makes the kernel set bit 7 in the
syscall number when delivering system call traps,
(i.e., deliver (SIGTRAP | 0x80)).

I'm not sure if this is possible on FreeBSD. PT_LWPINFO request looks
related but can't be sure.

=B9: http://linux.die.net/man/2/ptrace

--=20
Regards,
Ali Polatel

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