Module: ProcessShared::PosixCall

Included in:
RT
Defined in:
lib/process_shared/posix_call.rb

Instance Method Summary collapse

Instance Method Details

#error_check(*syms, &is_err) ⇒ Object

Replace methods in syms with error checking wrappers that invoke the original method and raise a SystemCallError with the current errno if the return value is an error.

Errors are detected if the block returns true when called with the original method’s return value.



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/process_shared/posix_call.rb', line 11

def error_check(*syms, &is_err)
  unless block_given?
    is_err = lambda { |v| (v == -1) }
  end

  syms.each do |sym|
    method = self.method(sym)
    define_singleton_method(sym) do |*args|
      ret = method.call(*args)
      if is_err.call(ret)
        raise SystemCallError.new("error in #{sym}", LibC.errno)
      else
        ret
      end
    end
  end
end