Initial patch by Jelle Zijlstra.

Patch by Jelle Zijlstra.

Patch by Jelle Zijlstra.

Initial patch by Jelle Zijlstra.

Patch by Jelle Zijlstra.

Initial patch by Jelle Zijlstra.

Patch by Jelle Zijlstra.

Reported by Oleg Gromyak on docs@

SOCK_RAW is marked as optional in the POSIX specification:

    http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html

Patch by Ed Schouten.

Initial patch by Sahil Chelaramani.

gather will raise exception in case of problem but wait just returns done and pending lists of futures.
For getting error every future result should be retrieved, which is boring and error prone.