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daemonizing don't work (corrected)

Sorry, I jumped the gun a bit ...

Closer inspection of my code yielded:

if ( (fd=open("/dev/tty",O_RDWR,0))>=0 ) 
{
#ifndef _WIN32
  if ( ioctl(fd,TIOCNOTTY,NULL)==-1 ) 
  {
    printf("Can\'t detach /dev/tty - can\'t daemonize !");
    return(errno)
  }
#endif
  close(fd);
}

So I must change my statement to: 
Daemonizing has not exactly worked for me 
under cygwin b<anything>.

Is ioctl->TIOCNOTTY supported ?

Steve B.