Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!yale!mintaka!bloom-beacon!morningstar.COM!karl
From: karl@morningstar.COM
Newsgroups: comp.windows.x
Subject: (none)
Message-ID: <9001172246.AA05046@remora.MorningStar.Com>
Date: 17 Jan 90 22:46:42 GMT
Sender: root@athena.mit.edu (Wizard A. Root)
Reply-To: karl@morningstar.com (Karl Fox)
Organization: The Internet
Lines: 57


			  X Window System Bug Report
			    xbugs@expo.lcs.mit.edu


VERSION:
    R4

CLIENT MACHINE and OPERATING SYSTEM:
    Sun 4/60 running SunOS 4.0.3c, Masscomp MC5500 running RTU 4.0A

DISPLAY TYPE:
    Sun bwtwo

WINDOW MANAGER:
    gwm

AREA:
    XTerm

SYNOPSIS:
    /dev/tty doesn't work on System V systems

DESCRIPTION:
    System V systems differ from Berkeley systems in the way that TTY
    line discipline opens decide whether or not to make the current
    device the controlling tty.  Berkeley systems want proc.p_pgrp == 0;
    System V systems want proc.p_pgrp == proc.p_pid.

REPEAT BY:
    Start xterm; do:

	echo stuff > /dev/tty

    /dev/tty's open returns ENODEV.

SAMPLE FIX:
    If the Berkeley way doesn't work, try the System V way:

    *** /usr/local/src/X.V11R4/mit/clients/xterm/main.c	Fri Jan 12 16:38:16 1990
    --- ./main.c	Tue Jan 16 12:19:53 1990
    ***************
    *** 1722,1727 ****
    --- 1722,1734 ----
		    ioctl(0, TIOCSPGRP, (char *)&pgrp);
		    setpgrp(0,0);
		    close(open(ttydev, O_WRONLY, 0));
    + 		if ((i = open("/dev/tty", O_WRONLY, 0)) >= 0)
    + 		    close(i);
    + 		else
    + 		    {
    + 		    setpgrp(0, pgrp);
    + 		    close(open(ttydev, O_WRONLY, 0));
    + 		    }
		    setpgrp (0, pgrp);
      #endif /* USE_SYSV_PGRP */