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32 lines
1.4 KiB
Scheme
32 lines
1.4 KiB
Scheme
;; net.scm -- the high-level network interface
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;; Copyright (c) 2010 Alex Shinn. All rights reserved.
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;; BSD-style license: http://synthcode.com/license.txt
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(define (open-net-io host service)
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(let lp ((addr (get-address-info host
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(if (integer? service)
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(number->string service)
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service)
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#f)))
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(if (not addr)
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(error "couldn't find address" host service)
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(let ((sock (socket (address-info-family addr)
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(address-info-socket-type addr)
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(address-info-protocol addr))))
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(if (negative? sock)
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(lp (address-info-next addr))
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(if (negative?
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(connect sock
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(address-info-address addr)
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(address-info-address-length addr)))
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(lp (address-info-next addr))
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(list (open-input-file-descriptor sock)
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(open-output-file-descriptor sock))))))))
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(define (with-net-io host service proc)
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(let ((io (open-net-io host service)))
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(if (not (pair? io))
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(error "couldn't find address" host service)
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(let ((res (proc (car io) (car (cdr io)))))
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(close-input-port (car io))
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res))))
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