Hi, On Fri, Apr 15, 2016 at 05:30:12PM -0700, Josh Stone wrote: > Hi folks, > > Just wanted to give an update on this project, running strace over the > gdbserver protocol. I've quoted my original message below, in case you > missed it the first time, and source is here: > https://github.com/cuviper/strace/ > > The code has been rebased onto a much newer development branch, as of a > couple weeks ago. I'll push new rebases occasionally to keep up. > There's still plenty of hacky/prototype hooks in place, so this isn't > ready for integration yet. I need to address testing too. > > Feature-wise, I've added file and piped-command support for gdbserver > communication, so you can connect in three ways: > > - tcp: strace -G host:port > - file: strace -G /dev/ttyS0 > - piped-command: strace -G '|vgdb' > > That last is how you can connect to a valgrind process. Support for > QCatchSyscalls is now in valgrind trunk. With this, you can strace a > process under valgrind without seeing the activity of valgrind itself! > > GDB 7.11 was release in February, with support for QCatchSyscalls, so > new gdbserver builds will now have everything "strace -G" needs. > > Stan Cox has started to get this working in gdbserver's non-stop mode. > Right now it runs all-stop, which means a multithreaded target will stop > every thread when any event is reported. That's usually what you want > for an interactive debugger, but in strace it may cause a lot of > interrupted syscalls -- full of EINTR/EAGAIN/ERESTARTSYS. So non-stop > will let other threads keep running freely while we process any event. > > Dmitry pointed out -P and -y path-based options before, which I haven't > found a solution for. Technically /proc/pid/fd access will work just > fine if the gdbserver is local anyway, but that's cheating, and can't be > assumed in general. It may just be that some strace features won't be > able to mix with this -G gdbserver mode.
Fair enough. > Anyway, work continues, and I hope people find this interesting. Josh, thanks for keeping us posted. -- ldv
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