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    On hp-ux, ioctl TIOCGPGRP always fails with errno ENOTTY (this is normal,
    explained in the USG part of create_process).

I cannot find that explanation, and I am not sure what "the USG part
of create_process" refers to.  Would you please show me the specific
code you mean?  I'm trying to understand this.  In particular,
I wonder why this code

	if (!NILP (p->subtty))
	  err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid);

does not get the right value.

Does err get set to -1 when the ioctl fails?