diff options
Diffstat (limited to 'winsup/cygwin/fhandler_socket.cc')
| -rw-r--r-- | winsup/cygwin/fhandler_socket.cc | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/winsup/cygwin/fhandler_socket.cc b/winsup/cygwin/fhandler_socket.cc index e279496..c3c24d2 100644 --- a/winsup/cygwin/fhandler_socket.cc +++ b/winsup/cygwin/fhandler_socket.cc @@ -804,14 +804,28 @@ int fhandler_socket::listen (int backlog) { int res = ::listen (get_socket (), backlog); - if (res) - set_winsock_errno (); - else + if (res && WSAGetLastError () == WSAEINVAL && get_addr_family () == AF_INET) + { + /* It's perfectly valid to call listen on an unbound INET socket. + In this case the socket is automatically bound to an unused + port number, listening on all interfaces. On Winsock, listen + fails with WSAEINVAL when it's called on an unbound socket. + So we have to bind manually here to have POSIX semantics. */ + struct sockaddr_in sa; + sa.sin_family = AF_INET; + sa.sin_port = 0; + sa.sin_addr.s_addr = INADDR_ANY; + if (!::bind (get_socket (), (struct sockaddr *) &sa, sizeof sa)) + res = ::listen (get_socket (), backlog); + } + if (!res) { if (get_addr_family () == AF_LOCAL && get_socket_type () == SOCK_STREAM) af_local_set_cred (); connect_state (connected); } + else + set_winsock_errno (); return res; } |