On Mon, Mar 3, 2014 at 10:15 PM, enh <e...@google.com> wrote: > On Sun, Mar 2, 2014 at 3:39 AM, Philippe Ombredanne > <pombreda...@nexb.com> wrote: >> On Tue, Feb 25, 2014 at 8:49 PM, enh <e...@google.com> wrote: [...] >> On the pipes side, I am a bit more puzzled as what more could be done.... >> >> pipe(2) has nothing we could decode afaik? >> >> Are you talking about decoding more of dup(2) dup2/3 and fcntl(2) with >> F_DUPFD when there is a pipe involved? >> >> I think that for pipes the only thing that can be done on a per >> syscall is to have a the pipe fd... and that tracing what went into >> the pipe is only something that can be done by reasoning not on a >> single syscall but across multiple calls and eventually multiple >> processes, in effect parsing a whole strace output, or is there >> something you think could be done at the syscall level? > > what i've done in the past is match the ids across processes to see > what process is on the other end. i don't know of any better way to do > this that go through all of /proc. i suppose strace could model fd > inheritance, but it all sounds hard and not worth the trouble. (i've > had to do this probably twice in the last decade!) i was just throwing > it out there.
Makes sense. I actually wrote a rather ugly piece of code to post-process a -tttff strace output and track files, pipes and sockets IOs across calls and processes. IMHO the best would be to wait a bit when we have a structure output and have a few example scripts that can do such whole trace analysis, the most interesting areas to me being files/descriptors, pipes and sockets operations. -- Philippe Ombredanne ------------------------------------------------------------------------------ Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. With Perforce, you get hassle-free workflows. Merge that actually works. Faster operations. Version large binaries. Built-in WAN optimization and the freedom to use Git, Perforce or both. Make the move to Perforce. http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk _______________________________________________ Strace-devel mailing list Strace-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/strace-devel
