move entry/exit debugging to 21.1
[unix-history] / usr / src / games / trek / shell.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)shell.c 5.3 (Berkeley) %G%";
#endif /* not lint */
/*
** CALL THE SHELL
*/
shell()
{
int i;
register int pid;
register int sav2, sav3;
if (!(pid = fork()))
{
setuid(getuid());
nice(0);
execl("/bin/csh", "-", 0);
syserr("cannot execute /bin/csh");
}
sav2 = signal(2, 1);
sav3 = signal(3, 1);
while (wait(&i) != pid) ;
signal(2, sav2);
signal(3, sav3);
}