Gah. I always get those backwards. I actually typed "SCM_RIGHTS" and then changed it to "SCM_CREDENTIALS". I still don't understand why fd passing is called "rights".
On Tue, Jan 27, 2015 at 11:25 AM, Simon McVittie < simon.mcvit...@collabora.co.uk> wrote: > On 27/01/15 15:55, Jasper St. Pierre wrote: > > Wayland requires two features that would perhaps make it unportable: FD > > passing (SCM_CREDENTIALS), and shared memory (allocate a temporary > > files, ftruncate it, mmap it, unlink it and then send the fd across the > > wire). Everything else is just a simple Unix domain socket. Does OS X > > support those two features? > > I think you mean SCM_RIGHTS? > > SCM_RIGHTS is "here's a message with an open fd attached". It's how > D-Bus does fd-passing, so if D-Bus fd-passing works on your favourite > platform, Wayland fd-passing should too. > > SCM_CREDENTIALS is "here's a message with my uid, gid and pid[1] > attached, the kernel will check that I haven't lied to you" (also called > SCM_CREDS on e.g. FreeBSD). Basically every Unix has either this or a > syscall to query those things or both, but most Unixes also have their > own unique spelling for the API, because standards are hard.[2] > > S > > [1] Strictly speaking "the uid, gid and pid I had at the time I opened > this socket" > [2] Except that FreeBSD, Dragonfly BSD and Hurd share SCM_CREDS, and > several platforms (sadly not including Linux) share getpeereid(). For > the gory details see libdbus source code. > > _______________________________________________ > gtk-devel-list mailing list > gtk-devel-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtk-devel-list > -- Jasper
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