Issue #5239 has been updated by Motohiro KOSAKI.

Status changed from Assigned to Rejected


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Bug #5239: bootstraptest/runner.rb: assert_normal_exit logic broken on Debian/GNU kFreeBSD
http://redmine.ruby-lang.org/issues/5239

Author: Lucas Nussbaum
Status: Rejected
Priority: Normal
Assignee: Motohiro KOSAKI
Category: 
Target version: 1.9.3
ruby -v: -


Hi,

assert_normal_exit() breaks on some platforms, such as Debian GNU/kFreeBSD.

It does:

    begin
      $stderr.reopen("assert_normal_exit.log", "w")
      io = IO.popen("#{@ruby} -W0 #{filename}")
      pid = io.pid
      th = Thread.new {
        io.read
        io.close
        $?
      }
      if !th.join(timeout)
        Process.kill :KILL, pid
        timeout_signaled = true
      end
      status = th.value
    ensure
      $stderr.reopen(old_stderr)
      old_stderr.close
    end
    if status.signaled?

The problem is that the call to $? in the thread cannot retrieve the exit value of the process started by popen. "$?" is transformed into a wait4() syscall, but wait4 is not allowed to inquire the state of non-child processes. And the popen process is not a child of the sub-thread, it is a child of the main thread.

http://pubs.opengroup.org/onlinepubs/009695399/functions/wait.html confirms that waitpid() is not supposed to work on non-child processes.

It works on Linux because wait4() is friendlier there and accepts to give the state of non-child processes.

This was introduced in svn revision 26700, when a timeout was added.


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