### Home Classes Methods

### In Files

- lib/ffi/io.rb

### Methods

- ::for_fd
- ::native_read

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# FFI::IO

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

### Public Class Methods

for_fd(fd, mode = "r") click to toggle source

@param [Integer] fd file decriptor @param [String] mode mode string @return [::IO] Synonym for IO::for_fd.

    # File lib/ffi/io.rb, line 29
    def self.for_fd(fd, mode = "r")
      ::IO.for_fd(fd, mode)
    end

native_read(io, buf, len) click to toggle source

@param [read] io io to read from @param [AbstractMemory] buf destination for data read from `io` @param [nil, Numeric] len maximul number of bytes to read from `io`. If `nil`,

    read until end of file.

@return [Numeric] length really read, in bytes

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.

    # File lib/ffi/io.rb, line 43
    def self.native_read(io, buf, len)
      tmp = io.read(len)
      return -1 unless tmp
      buf.put_bytes(0, tmp)
      tmp.length
    end

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