On Monday, August 25, 2014 9:28:16 pm Mateusz Guzik wrote: > On Mon, Aug 25, 2014 at 01:35:58PM -0400, John Baldwin wrote: > > On Monday, August 25, 2014 07:02:41 PM Mateusz Guzik wrote: > > > On Mon, Aug 25, 2014 at 10:23:19AM -0400, John Baldwin wrote: > > > > On Sunday, August 24, 2014 09:04:09 AM Mateusz Guzik wrote: > > > > > Author: mjg > > > > > Date: Sun Aug 24 09:04:09 2014 > > > > > New Revision: 270444 > > > > > URL: http://svnweb.freebsd.org/changeset/base/270444 > > > > > > > > > > Log: > > > > > Fix getppid for traced processes. > > > > > > > > > > Traced processes always have the tracer set as the parent. > > > > > Utilize proc_realparent to obtain the right process when needed. > > > > > > > > Are you sure this won't break things? I know of several applications > > > > that > > > > expect a debugger to be the parent when attached and change behavior as > > > > a > > > > result (e.g. inserting a breakpoint on an assertion failure rather than > > > > generating a core). > > > > > > Well, this is what linux and solaris do. > > > > Interesting. > > > > > I don't feel strongly about this change. If you really want I'm happy to > > > revert. > > > > In general I'd like to someday have the debugger-debuggee relationship not > > override parent-child and this is a step in that direction. However, this > > will break existing applications, so this needs to be clearly documented in > > the release notes. In addition, we should probably advertise how a process > > can correctly determine if it is being run under a debugger (right now you > > can > > do 'getppid()' and use strcmp or strstr on the p_comm of that pid so you > > can > > do different things for "gdb" vs "gcore", etc. so just checking P_TRACED > > from > > kinfo_proc wouldn't be equivalent in functionality) > > > > Is any of programs you mentioned opensource or at least publicly > available?
The only ones I can currently think of are not publicly available. > In linux they provide TracerPid in /proc/<pid>/status. > > We could add a specific sysctl or extend kinfo with the same data. A tracer pid would be sufficient. -- John Baldwin _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
