Swift - server socket cannot rebind - swift

Question

I am trying to program a simple server socket. It is successful to connect to client. But after I disconnect, and try to re-establish the server socket, during binding I got an error (errno = 48, EADDRINUSE). Anyone know how to fix it?
func initServerSocket(serverSocket: Int32) -> Int32 {
var clientSocket: Int32 = -1
var server_addr_size: Int
var client_addr_size = socklen_t(MemoryLayout<sockaddr_in>.size)
var server_addr = sockaddr_in()
var client_addr = sockaddr_in()
server_addr_size = MemoryLayout<sockaddr_in>.size
memset(&server_addr, 0, server_addr_size);
server_addr.sin_family = sa_family_t(AF_INET)
server_addr.sin_port = UInt16(8080).bigEndian
server_addr.sin_addr.s_addr = UInt32(0x00000000)
let bind_server = withUnsafePointer(to: &server_addr) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
bind(serverSocket, $0, socklen_t(MemoryLayout<sockaddr_in>.stride))
}
}
if bind_server == -1 {
print("[Fail] Bind Port, Error: \(errno)");
exit(1);
} else {
print("[Success] Binded Port \(bind_server)");
}
if listen(serverSocket, 5) == -1 {
print("[Fail] Listen");
exit(1);
} else {
print("[Success] Listening : \(server_addr.sin_port) Port ...");
}
clientSocket = withUnsafeMutablePointer(to: &client_addr) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
accept(serverSocket, $0, &client_addr_size)
}
}
if clientSocket == -1 {
print("[Fail] Accept Client Connection \(errno)");
exit(1);
} else {
print("[Success] Accepted Client : \(inet_ntoa(client_addr.sin_addr)!) : \(client_addr.sin_port)!");
}
return clientSocket
}
Disconnect function:
func disconnect() {
if clientSocket != -1 {
self.inputStream.close()
self.outputStream.close()
if close(HiveConfig.clientSocket) == -1 {
print("serverSocket close error")
}
if close(HiveConfig.serverSocket) == -1 {
print("serverSocket close error")
}
}
}

Answer 1

I figure out that on my code before bind need to add the following code to make the address reused.
var opt:Int = 1
setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR, &opt, socklen_t(MemoryLayout.size(ofValue: opt)));