On Thu, May 22, 2014 at 08:45:44PM +0530, Zubin Mithra wrote: > I've restructured it a bit more, added in dup* calls, please see commit at > [1] and sample output at [2]. > > [1] > https://github.com/eQu1NoX/strace/commit/3d471ba8fccc531b8bc33b6467644b2d17ba8cc0 > [2] https://gist.github.com/eQu1NoX/ccd6e2f9d45e2e0e82f9 > > > There is a receive call, that allows to forward open file descriptors > > between > > processes. I do not known, if you call those received fds "socket fds", > > since > > they could be any (unresolvable) fd -- unless you poke into /proc for more > > information. > > Could you please give more information on which syscall you are referring > to? I couldn't find a syscall that matched your description.
recvmsg and recvmmsg, decoded using printcmsghdr (see SCM_RIGHTS). I suppose it should just use printfd. These syscalls don't return file descriptors, they may receive them from the kernel in a way more similar to pipe/pipe2/socketpair rather than open/creat/dup/dup2/dup3. -- ldv
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