// see docs/client_master_handshake.md func handleClientConnection(tree *processtree.ProcessTree, usock *unixsocket.Usock) { defer usock.Close() // we have established first contact to the client. command, clientPid, arguments, err := receiveCommandArgumentsAndPid(usock, nil) commandNode, slaveNode, err := findCommandAndSlaveNodes(tree, command, err) if err != nil { // connection was established, no data was sent. Ignore. return } command = commandNode.Name // resolve aliases clientFile, err := receiveTTY(usock, err) defer clientFile.Close() if err == nil && slaveNode.Error != "" { // we can skip steps 3-5 as they deal with the command process we're not spawning. // Write a fake pid (step 6) usock.WriteMessage("0") // Write the error message to the terminal clientFile.Write([]byte(slaveNode.Error)) // Skip step 7, and write an exit code to the client (step 8) usock.WriteMessage("1") return } commandUsock, err := bootNewCommand(slaveNode, command, err) defer commandUsock.Close() err = sendClientPidAndArgumentsToCommand(commandUsock, clientPid, arguments, err) err = sendTTYToCommand(commandUsock, clientFile, err) cmdPid, err := receivePidFromCommand(commandUsock, err) err = sendCommandPidToClient(usock, cmdPid, err) exitStatus, err := receiveExitStatus(commandUsock, err) err = sendExitStatus(usock, exitStatus, err) if err != nil { slog.Error(err) } // Done! Hooray! }