The %listen() function marks the specified socket as accepting incoming connections and limits the number of outstanding connections in the system queue.
code = %listen(fd, backlog)
| fd | File descriptor of the local socket returned by a previous call to the FlashBASIC C function %socket(). |
| backlog | Maximum number of outstanding connections. The maximum value for this number is SOMAXCONN defined in the include file: dm,bp,unix.h socket.h. |
To compile successfully, the statement cfunction socket.builtin must be included in the source code. Upon successful completion, a value of 0 is returned in code. In case of error, a value of -1 is returned and the system(0) function is set to the value of errno.
cfunction socket.builtin include dm,bp,includes sysid.inc include dm,bp,unix.h socket.h * Create a socket fd=%socket(af$inet, sock$stream, 0) * Bind the socket to a local Ethernet port. * Use default address. char buffer[1024] if %bind(fd, af$inet, inaddr$any, 1024)<0 then crt ’bind failed’; stop end * Wait for incoming connection and allow up to * three more to be waiting. %listen(fd, 3) * Accept a connection until got them all loop address=0; port=0 socket=%accept(fd, &address, &port) until socket<0 do crt ’Called by address ’:addr:’, port #’:port * Read data from the data link %recv(socket, buffer, 1024) char buff[1024] * Done with this connection, close it %closesocket(socket) repeat