From: eQuiNoX <equ...@gm...> - 2014-03-04 13:16:23
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On Mon, Mar 3, 2014 at 6:26 PM, Dmitry V. Levin <ld...@al...> wrote: > On Mon, Mar 03, 2014 at 10:52:48AM +0530, Zubin Mithra wrote: >> >> I believe that the first step would be to document and note down the system >> >> calls that belong to one or more of the above categories and their system >> >> call numbers, and if the -yy flag is used, check the tcp->scno against >> >> these numbers and act accordingly. >> >> >> >> Is there something I'm missing? I'd love any kind of feedback! >> > >> > You probably don't need to care about tcp->scno to implement -yy mode. >> >> Just a little something I'd like to clarify -- did you mean I should >> use tcp->s_ent->sys_name instead? Just to make sure I'm not terribly >> misunderstanding something. :) > > The way how strace decodes each syscall is, shortly speaking, this: > 1. take a syscall number (tcp->scno); > 2. filter out those syscalls that should not be decoded; > 3. call the handler assigned for the syscall (tcp->s_ent->sys_func). > > At the point of syscall decoding where absolute paths decoding should > be implemented, the syscall handler is already called, so neither > tcp->scno nor tcp->s_ent->sys_func is required for decoding. > > Only when you are changing syscall filtering algorithms you may need > to know scno/sys_func in advance. > > Just have a look at the code. :) Already on it, thanks heaps Dmitry ! > > > -- > ldv > > ------------------------------------------------------------------------------ > 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 > Str...@li... > https://lists.sourceforge.net/lists/listinfo/strace-devel > |