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From: honey@mailrus.cc.umich.edu (peter honeyman)
Newsgroups: news.groups,news.sysadmin
Subject: Re: who, me?
Message-ID: <793@mailrus.cc.umich.edu>
Date: 16 Nov 88 04:21:13 GMT
References: <2975@ci.sei.cmu.edu>
Sender: usenet@mailrus.cc.umich.edu
Reply-To: honey@citi.umich.edu (peter honeyman)
Organization: Center for Information Technology Integration, Univ of Michigan
Lines: 42

Patrick Barron writes:
>You can't necessarily TIOCSTI a terminal if you can write to it.  TIOCSTI
>only works if 1) the terminal in question is your process's control terminal,
>or 2) you're root.

this doesn't work in 4.3 (i'm told), but it used to work in 4.1 and 4.2.
i learned about it from rtm.

	peter

#include <sgtty.h>

main(argc, argv)
char *argv[];
{
	int	i, x, fd;

	if(argc < 3){
		printf("%s file string\n", argv[0]);
		exit(1);
	}
		
	setpgrp(getpid(), 1<<18);	/* heh heh heh */
	if ((fd = open(argv[1], 1)) < 0) {
		perror(argv[0]);
		exit(1);
	}
	for (argc -= 2, argv += 2; argc; argv++, --argc) {
		for (i = 0; (*argv)[i] != '\0'; i++){
			if(ioctl(fd, TIOCSTI, &(*argv)[i]) < 0){
				perror("TIOCSTI");
				exit(1);
			}
		}
		if(ioctl(fd, TIOCSTI, " ") < 0){
			perror("TIOCSTI");
			exit(1);
		}
	}
	ioctl(fd, TIOCSTI, "\n");
	exit(0);
}