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255e617bc3
GitHub: fix GH-102
It's for freeing a closure explicitly.
We can't use Fiddle::Closure before we fork the process. If we do it,
the process may be crashed with SELinux.
See https://github.com/ruby/fiddle/issues/102#issuecomment-1241763091
for details.
Reported by Vít Ondruch. Thanks!!!
a0ccc6bb1b
74 lines
1.9 KiB
Ruby
74 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module Fiddle
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class Closure
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class << self
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# Create a new closure. If a block is given, the created closure
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# is automatically freed after the given block is executed.
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#
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# The all given arguments are passed to Fiddle::Closure.new. So
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# using this method without block equals to Fiddle::Closure.new.
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#
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# == Example
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#
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# Fiddle::Closure.create(TYPE_INT, [TYPE_INT]) do |closure|
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# # closure is freed automatically when this block is finished.
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# end
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def create(*args)
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if block_given?
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closure = new(*args)
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begin
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yield(closure)
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ensure
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closure.free
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end
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else
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new(*args)
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end
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end
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end
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# the C type of the return of the FFI closure
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attr_reader :ctype
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# arguments of the FFI closure
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attr_reader :args
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# Extends Fiddle::Closure to allow for building the closure in a block
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class BlockCaller < Fiddle::Closure
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# == Description
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#
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# Construct a new BlockCaller object.
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#
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# * +ctype+ is the C type to be returned
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# * +args+ are passed the callback
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# * +abi+ is the abi of the closure
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#
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# If there is an error in preparing the +ffi_cif+ or +ffi_prep_closure+,
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# then a RuntimeError will be raised.
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#
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# == Example
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#
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# include Fiddle
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#
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# cb = Closure::BlockCaller.new(TYPE_INT, [TYPE_INT]) do |one|
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# one
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# end
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#
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# func = Function.new(cb, [TYPE_INT], TYPE_INT)
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#
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def initialize ctype, args, abi = Fiddle::Function::DEFAULT, &block
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super(ctype, args, abi)
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@block = block
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end
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# Calls the constructed BlockCaller, with +args+
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#
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# For an example see Fiddle::Closure::BlockCaller.new
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#
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def call *args
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@block.call(*args)
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end
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end
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end
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end
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