Class: Toaster::PtraceUtil

Inherits:
Object
  • Object
show all
Defined in:
lib/toaster/state/ptrace_util.rb

Constant Summary collapse

WORD_SIZE = 
8

Class Method Summary collapse

Class Method Details

.get_filename_for_fd(pid, fd) ⇒ Object 



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# File 'lib/toaster/state/ptrace_util.rb', line 38

def self.get_filename_for_fd(pid, fd)
  path = "/proc/#{pid}/fd/#{fd}"
  begin
    return File.readlink(path)
  rescue
    return nil
  end
end

.read_string(ptrace_target, addr) ⇒ Object 



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# File 'lib/toaster/state/ptrace_util.rb', line 17

def self.read_string(ptrace_target, addr)
  str = ""
  do_continue = true
  iter = 0
  while do_continue
    v = ptrace_target.text.peek(addr + (WORD_SIZE * iter))
    (0..7).each do |shift_bytes|
      shift = 8 * shift_bytes
      byte = (v >> shift) & 0xFF
      if byte == 0
        #puts "END OF STRING!!"
        do_continue = false
        break
      end
      str += byte.chr
    end
    iter += 1
  end
  return str
end