fork-exec + socket = hang? - a ruby expression by jack tang

A ruby expression by jack tang from his posterous page Software Is Art!

ThreadA: exec_point_a -> exec_point_b -> exec_point_c
ThreadB:                            exec_point_a -> exec_point_b -> ...

In Ruby 1.8
  ObjectSpace.each_object(IO) do |io|
    unless [STDIN, STDOUT, STDERR].include?(io)
      unless(io.closed?)
      begin
        io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
      rescue ::Exception => err
      end
      end
    end
  end

In Ruby 1.9
  ObjectSpace.each_object(IO) do |io|
    unless [STDIN, STDOUT, STDERR].include?(io)
      unless(io.closed?)
      begin
        io.close_on_exec= true
      rescue ::Exception => err
      end
      end
    end
  end

[I believe ee cummings would be proud. end end end]

A bit more information if you understand this kind of poetry:

Fork-exec is a commonly used technique in Unix whereby an executing process spawns a new program. fork() is the name of the system call that the parent process uses to "divide" itself ("fork") into two identical processes. After calling fork(), the created child process is actually an exact copy of the parent - which would probably be of limited use - so it replaces itself with another process using the system call exec().

Here is the full post on Software Is Art!

@jmacofearth
permalink: http://bit.ly/fork-exec-poetry

Posted via web from Poetry is Code