Ability to tell the difference between normal and syscall traps

[Ali Polatel]

Does FreeBSD's ptrace have a way to tell the difference between normal
traps and those caused by a system call?

On Linux¹ 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.

¹: http://linux.die.net/man/2/ptrace

-- 
Regards,
Ali Polatel
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