ftp.nice.ch/pub/next/developer/languages/c/djgpp-NS.s.tar.gz#/djgpp/src/gas-2.3/libiberty/waitpid.c

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int
waitpid (pid, stat_loc, options)
	int pid, *stat_loc, options;
{
  for (;;)
    {
      int wpid = wait(stat_loc);
      if (wpid == pid || wpid == -1)
	return wpid;
    }
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.