Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!gatech!dcc1!douglas
From: douglas@dcc1.UUCP (Douglas B. Jones)
Newsgroups: comp.unix.wizards
Subject: HELP: stop job (csh) su because of tty output
Message-ID: <275@dcc1.UUCP>
Date: Sat, 23-May-87 21:45:47 EDT
Article-I.D.: dcc1.275
Posted: Sat May 23 21:45:47 1987
Date-Received: Sun, 24-May-87 03:21:12 EDT
Sender: root@dcc1.UUCP
Organization: DeKalb College, Clarkston GA
Lines: 116
Keywords: stop jobs, csh, su


	Hi UWs,

	I need some help here. The below shar file has the problem in it.
	Here is a description of the porblem:

	After compiling (instruction in program) the program below, I
	execute it with:
	%a.out username
	%^D				(now in users csh shell)
	(I typed in the control-d above and exited back to my shell).
	After leaving the shell, I get the message that my a.out program
	is stopped due to tty output. I must then do a:
	%fg
	to get it to continue the program. Well, I don't want this to happen,
	but I want to go on and execute the rest of the program without this
	interuption.

	This program is actually a small example of a much bigger program. In
	the bigger program, I have input afterwords. So, I can't do a:
	signal(SIGTTOU,SIG_IGN)
	in the program, because it (the program) will go into an inifinite loop
	trying to read from the terminal. I don't know why, but it does happen.

	I even try running this from the 'sh' under my csh login, the csh
	suspended both the sh and the a.out with the tty output message.

	The interuption (tty output stop) is pointed output in the below
	program by the DO_IOCTL flag. If this is not defined, then the
	program will run fine. If you define this, you get the stop message.
	It appears, then, that when some ioctl() is done that the csh gets
	a SIGTTOU signal. I'm not really sure here, but I could sure use
	some help.

	You will also notice that I have a rlogin line commented out. If
	you use the rlogin command instead of the su command, everything
	works ok (even with DO_IOCTL defined).

	About the rlogin command below:
	This program was written on machince dcc2, so I am doing an rlogin
	on to the machine I am on when I wrote this program. I am mailing
	this mail from another machince (dcc1). If you decide not to reply
	to the net, but to me, please mail to me on dcc1.

	Well, I hope my above comments are explanatory enough.

	Thanks for any help in advance,
	Douglas


=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
        U.S. MAIL                |        UUCP
 Douglas B. Jones                |    |akgua----\
 Academic Computer Center        |    |cbosgd----\
 DeKalb College                  | ...!|hplabs---->!gatech!{dcc1,dcc2}!douglas
 555 N. Indian Creek Drive       |    |ihnp4---- /       or
 Clarkston, Georgia 30021        |    |seismo---/   douglas@dcc1
                                 |    |ulysses-/    douglas@dcc2
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
#	t.c
# This archive created: Sat May 23 21:27:22 1987
# By:	Douglas B. Jones (DeKalb College, Clarkston GA)
export PATH; PATH=/bin:$PATH
echo shar: extracting "'t.c'" '(457 characters)'
if test -f 't.c'
then
	echo shar: will not over-write existing file "'t.c'"
else
sed 's/^X//' << \SHAR_EOF > 't.c'
X#include <curses.h>
X/*	%cc -DDO_IOCTL t.c -lcurses -ltermcap	*/
X
Xmain(argc,argv)
Xint	argc;
Xchar	*argv[];
X{
Xchar	buf[80];
X
Xif (argc != 2) {
X	fprintf(stderr,"usage: t login_name\n");
X	exit(1);
X}
X
Xinitscr();
X
Xsprintf(buf,"/bin/su %s",argv[1]);
X/*sprintf(buf,"/usr/ucb/rlogin dcc2 -l %s",argv[1]);*/
Xsystem(buf);
X
X#ifdef	DO_IOCTL
Xraw();
Xnoecho();
Xnoraw();
Xecho();
X#endif	DO_IOCTL
Xclear();
Xmove(LINES-2,0);
Xprintw("BYE");
Xmove(LINES-1,0);
Xrefresh();
Xendwin();
X}
SHAR_EOF
if test 457 -ne "`wc -c < 't.c'`"
then
	echo shar: error transmitting "'t.c'" '(should have been 457 characters)'
fi
fi # end of overwriting check
#	End of shell archive
exit 0