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1 #//////////////////////////////////////////////////////////////////////
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2 #
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3 # unix_math.rb
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4 # Copyright 2015 Tassilo Philipp
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5 #
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6 # Dyncall sample loading libm and calling functions
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7 #
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8 #///////////////////////////////////////////////////////////////////////
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9
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10 require 'rbdc'
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11
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12 l = Dyncall::ExtLib.new
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13 if l.load('/usr/lib/libm.so') != nil and l.syms_init('/usr/lib/libm.so') != nil
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14 puts 'Symbols in libm: '+l.syms_count.to_s
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15 puts 'All symbol names in libm:'
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16 l.syms_each { |s| puts s }
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17
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18 puts 'libm has sqrtf()? ' + l.exists?(:sqrtf) .to_s
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19 puts 'libm has pow()? ' + l.exists?(:pow) .to_s
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20 puts 'libm has not_in_libm()? ' + l.exists?(:not_in_libm).to_s
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21
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22 puts 'sqrtf(36.f) = ' + l.call(:sqrtf, 'f)f', 36.0) .to_s
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23 puts 'pow(2.0, 10.0) = ' + l.call(:pow, 'dd)d', 2.0, 10.0).to_s
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24 end
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