Method: Bio::Command.call_command_fork

Defined in:

lib/bio/command.rb

.call_command_fork(cmd, options = {}) ⇒ Object

Executes the program via fork (by using IO.popen(“-”)) and exec. A block must be given. An IO object is passed to the block.

From the view point of security, this method is recommended rather than call_command_popen.

---

Arguments:

• (required) cmd: Array containing String objects

• (optional) options: Hash

Returns

(undefined)

# File 'lib/bio/command.rb', line 196

def call_command_fork(cmd, options = {})
  dir = options[:chdir]
  cmd = safe_command_line_array(cmd)
  IO.popen("-", "r+") do |io|
    if io then
      # parent
      yield io
    else
      # child
      # chdir to options[:chdir] if available
      begin
        Dir.chdir(dir) if dir
      rescue Exception
        Process.exit!(1)
      end
      # executing the command
      begin
        Kernel.exec(*cmd)
      rescue Errno::ENOENT, Errno::EACCES
        Process.exit!(127)
      rescue Exception
      end
      Process.exit!(1)
    end
  end
end