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Module: FFI::IO

Relationships & Source Files
Defined in: lib/ffi/io.rb

Overview

This module implements a couple of class methods to play with IO.

Class Method Summary

Class Method Details

.for_fd(fd, mode = "r") ⇒ ::IO

Synonym for .for_fd.

Parameters:

  • fd (Integer) —

    file decriptor

  • mode (String) (defaults to: "r") —

    mode string

[ GitHub ] 

  


# File 'lib/ffi/io.rb', line 39



def self.for_fd(fd, mode = "r")
  ::IO.for_fd(fd, mode)
end


  








  

    .native_read(io, buf, len)  ⇒ Integer 
  



  

    

A version of IO#read that reads data from an IO and put then into a native buffer.



This will be optimized at some future time to eliminate the double copy.


  





  
Parameters:


    
  
  • 
    io
    (#read)
—    
    

    io to read from
    

    
  
    • 
  
  • 
    buf
    (AbstractMemory)
—    
    

    destination for data read from io
    

    
  
    • 
  
  • 
    len
    (nil, Integer)
—    
    

    maximul number of bytes to read from io. If nil, read until end of file.
    

    
  
    • 



Returns:


    
  
  • 
    (Integer)
—    
    

    length really read, in bytes
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/ffi/io.rb', line 53



def self.native_read(io, buf, len)
  tmp = io.read(len)
  return -1 unless tmp
  buf.put_bytes(0, tmp)
  tmp.length
end