44 lines
1.2 KiB
Scheme
44 lines
1.2 KiB
Scheme
; some useful utilities
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(define (host-name-or-ip addr)
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(with-fatal-error-handler
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(lambda (condition more)
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(call-with-values
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(lambda () (socket-address->internet-address addr))
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(lambda (ip port)
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(format-internet-host-address ip))))
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(host-info:name (host-info addr))))
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(define (on-interrupt interrupt thunk)
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(let lp ((event (most-recent-sigevent)))
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(let ((next (next-sigevent event interrupt)))
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(thunk)
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(lp next))))
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(define (socket-address->string socket-address . with-port?)
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(let ((with-port? (:optional with-port? #t)))
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(receive (host-address service-port)
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(socket-address->internet-address socket-address)
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(if with-port?
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(format #f "~A:~A"
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(format-internet-host-address host-address)
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(format-port service-port))
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(format #f "~A"
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(format-internet-host-address host-address))))))
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(define (dump fd)
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(let loop ((c (read-char fd)))
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(cond ((not (eof-object? c))
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(write-char c)
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(loop (read-char fd))))))
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(define (system-fqdn)
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(let ((host (host-info (system-name))))
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(let loop ((addresses (host-info:addresses host)))
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(if (null? addresses)
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#f
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(or (dns-lookup-ip (car addresses))
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(loop (cdr addresses)))))))
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