On Sat, May 08, 2010 at 02:15:09PM +0300, Ali Polatel wrote: > Does FreeBSD's ptrace have a way to tell the difference between normal > traps and those caused by a system call? > > On Linux? 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. > > ?: http://linux.die.net/man/2/ptrace
There is already procfs(5)-based interface to get a reason for stop. Look at the ioctl PIOCSTATUS. Yes, you have to mount procfs. The interface can be lifted to ptrace(2), but I think using the capacity of procfs is not wrong there.
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