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#lang racket
(require racket/tcp)
(define outs '())
(define (write-all data out)
(for-each
(lambda (o)
(cond [(not (eq? o out)) (displayln data o)]))
outs))
(define (worker in out)
(define (loop msg)
(if (equal? msg eof)
(begin (close-input-port in)
(close-output-port out)
(set! outs (remove out outs)))
(let ([data (read-line in)])
(displayln data)
(write-all (string-append ">>> " data) out)
(loop data))))
(loop 'y))
(define (listener sock)
(define-values (in-conn out-conn) (tcp-accept sock))
(file-stream-buffer-mode in-conn 'none)
(file-stream-buffer-mode out-conn 'none)
(thread (lambda () (worker in-conn out-conn)))
(set! outs (cons out-conn outs))
(writeln (length outs))
(listener sock))
(define sock (tcp-listen 1678 4 #t))
(listener sock)
(tcp-close sock)
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