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  36         id 1Ra8Zk-0005mV-9W; Mon, 12 Dec 2011 11:18:00 -0500\r
  37 Date: Mon, 12 Dec 2011 11:18:00 -0500\r
  38 From: Austin Clements <amdragon@MIT.EDU>\r
  39 To: Tomi Ollila <tomi.ollila@iki.fi>\r
  40 Subject: Re: [PATCH] test/smtp-dummy: add --background option for\r
  41         backgrounding after listen(2)\r
  42 Message-ID: <20111212161800.GO2760@mit.edu>\r
  43 References: <yf6obvdn8ha.fsf@taco2.nixu.fi>\r
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  77 \r
  78 Quoth Tomi Ollila on Dec 12 at  4:57 pm:\r
  79 > To avoid the possibility that smtp-dummy doesn't have chance to listen\r
  80 > its bound socket until something tries to send message to it this\r
  81 > option can be used for caller to wait until socket is already listening\r
  82 > for a connection.\r
  83 > ---\r
  84 > \r
  85 > When test_require_external_prereq() is changed to use associative\r
  86 > array to check whether prereq is missing bash script is often \r
  87 > so fast that it already waiting for smtp-dummy to exit until\r
  88 > socket is listening. i.e sending QUIT to 127.0.0.1:25025 fails\r
  89 > since there is no listener. (fork(2) & execve(2) count goes to zero\r
  90 > in test_require_external_prereq (from 3 fork()s, 2 execve()s).\r
  91 \r
  92 Perhaps smtp-dummy should always work this way?  There's a race even\r
  93 in the working case, since Emacs could try to connect to the\r
  94 smtp-dummy before it's listening (perhaps Emacs retries in that case,\r
  95 but I couldn't find any code to do so).\r
  96 \r
  97 How are you going to wait on the dummy, since you don't know its PID\r
  98 any more?\r