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[racket] SIGCHLD handler called in stderr

From: Sergey Khorev (sergey.khorev at gmail.com)
Date: Fri Dec 7 00:02:20 EST 2012		 
Hi,

When using embedded Racket, I noticed it can write to stderr directly:

static void got_sigchld() XFORM_SKIP_PROC
{
  if(-1 == write(2, "SIGCHLD handler called (some thread has SIGCHLD
unblocked)\n", 59)) {

  }
}

Is it be possible to disable this for embedded configuration as it
messes up stderr of the host application?`
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