Re: Update: Failing tests: Re: RFC: [PATCH] SCM_CREDS support

[Svante Signell]

On Mon, 2016-03-14 at 00:57 +0100, Samuel Thibault wrote:
> Hello,
> 
> Svante Signell, on Sun 13 Mar 2016 14:19:35 +0100, wrote:
> > Running the code reveals that the current implementation in glibc is buggy:
> > 
> > ./scm_rights+creds_recv
> > Number of SCM_RIGHTS [<=3], SCM_CREDS [<=2]: [1,1] 
> > Input error: Using defaults: 
> > NRIGHTS = 1, NCREDS = 1
> > scm_rights+creds_send.c: msgh.msg_controllen = 112 (from control_un)
> > Receiving via datagram socket
> > recvmsg: (os/kern) invalid right
> 
> I've had a closer look, what happens here is that the
> mach_port_mod_refs() call on the rendezvous port fails because the port
> type of the rendezvous port is DEADNAME, i.e. the other end dropped the
> port.  Indeed, your sending program terminates as soon as it has sent
> its message.  You need to make it wait at least a bit for the receiver
> to get to receive the credentials.

Well, the program works perfectly on kFreeBSD (Linux is different). And with my
old implementation it worked perfectly too. Maybe the recvmsg/sendmsg code has
to be modified?