Report EMFILE/ENFILE from xs_socket()

This patch propoagates the error from signaler and mailbox
initialisation up the stack.

To achieve this signaler and mailbox classes were re-written
is C-like syntax.

Finally, shutdown_stress test now ignores EMFILE/ENFILE errors.
Thus, the tests should pass even on OSX which sets the max
number of file descriptors pretty low by default.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/socket_base.hpp b/src/socket_base.hpp
index 100b5c5..740fdde 100644
--- a/src/socket_base.hpp
+++ b/src/socket_base.hpp
@@ -130,6 +130,11 @@ namespace xs
 
     private:
 
+        //  Initialise the object. This function is separate from constructor
+        //  so that it can return errors. If not successful, it deallocates
+        //  the socket straight away.
+        int init ();
+
         //  To be called after processing commands or invoking any command
         //  handlers explicitly. If required, it will deallocate the socket.
         void check_destroy ();
@@ -174,6 +179,7 @@ namespace xs
 
         //  Socket's mailbox object.
         mailbox_t mailbox;
+        bool initialised;
 
         //  List of attached pipes.
         typedef array_t <pipe_t, 3> pipes_t;