Hi, kern_exit.c:wait1() has the following lines in -STABLE: > if ((p->p_sigparent != SIGCHLD) ^ ((uap->options & WLINUXCLONE) != 0)) > continue;
As it is, if you ptrace(PT_ATTACH) to a process started with rfork(flags|RFLINUXTHPN), and do a waitpid() as you normally would, this causes waitpid() to fail with ECHILD, because the original parent/child relationship doesn't hold, and the debugger doesn't know that the debugee was started in this fashion. This can also mean that the ptrace(PT_DETACH) ends up killing the process, because you can't guarantee that it is stopped by the time you get to do the ptrace(PT_DETACH). In order to allow existing ptrace(2)-using programs to attach to such processes, would the following be more appropriate? > if ((p->p_sigparent != SIGCHILD && (p->p_flag & PTRACED) == 0) ^ > ((uap->options & WLINUXCLONE) != 0)) (BTW: Why "^" rather than "!=" ? I would have thought a boolean operator more natural here.) Cheers, Peter. To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
