46 lines
1.4 KiB
Clojure
46 lines
1.4 KiB
Clojure
;;; Basic set of JNA tests for use with Clojure
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(gen-interface
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:name jna.CLibrary
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:extends [com.sun.jna.Library]
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:methods [[printf [String] void]])
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(def libc (com.sun.jna.Native/loadLibrary "c" jna.CLibrary))
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(.printf libc "Hello, World\n")
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(defn- get-function [s]
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`(com.sun.jna.Function/getFunction ~(namespace s) ~(name s)))
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(defmacro jna-call
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"Call a native library function"
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[return-type function-symbol & args]
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`(.invoke ~(get-function function-symbol) ~return-type (to-array [~@args])))
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(jna-call Integer c/printf "-> %d\n" 42)
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; Write a macro that wraps a native library function call
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(defmacro jna-func
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[ret-type func-symbol]
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`(let [func# ~(get-function func-symbol)]
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(fn [& args#]
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(.invoke func# ~ret-type (to-array args#)))))
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(def c-printf (jna-func Integer c/printf))
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(c-printf "int: %d\nfloat: %.2f\n" 42 42.0)
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(defmacro jna-malloc [size]
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`(let [buffer# (java.nio.ByteBuffer/allocateDirect ~size)
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pointer# (com.sun.jna.Native/getDirectBufferPointer buffer#)]
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(.order buffer# java.nio.ByteOrder/LITTLE_ENDIAN)
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{:pointer pointer# :buffer buffer#}))
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(let [struct (jna-malloc 44)]
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(jna-call Integer c/statvfs "/tmp" (:pointer struct))
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(let [fbsize (.getInt (:buffer struct))
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frsize (.getInt (:buffer struct) 4)
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blocks (.getInt (:buffer struct) 8)
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bfree (.getInt (:buffer struct) 12)
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bavail (.getInt (:buffer struct) 16)]
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(c-printf "# ignore statvfs\n")))
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