ca4f574f4c
This patch adds prinicipal support for transmitting socket descriptors as RPC payload. Socket descriptors are handled by the linux-specific implementation of the capability marshalling and unmarshalling functions in 'ipc.h'. The 'Message' type in 'src/platform/linux_socket.h' has been extended to carry multiple descriptors in a single message. Unfortuately, we hit a problem (and potential show stopper) here: lx_sendmsg failed with -109 in lx_call() The error code corresponds to ETOOMANYREFS. There is only one place in the Linux kernel where this error code is used (net/unix/af_unix.c). The code for 'unix_attach_fds()' suggests that there is a limit with regard to the maximum number of references for a given Unix domain socket. When the error occurs, core and init are running. The socket of core's server entrypoint is present in the '/proc/pid/fd' of those processes 8 times. The error occurs when core tries to perform an RPC to the entrypoint to perform 'Ram_session::transfer_quota()' (base/include/base/child.h at line 248). |
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This repository contains the Linux-specific implementation of Genode.