1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 static char sccsid[] = "@(#)shell.c 5.3 (Berkeley) 06/18/88"; 20 #endif /* not lint */ 21 22 /* 23 ** CALL THE SHELL 24 */ 25 26 shell() 27 { 28 int i; 29 register int pid; 30 register int sav2, sav3; 31 32 if (!(pid = fork())) 33 { 34 setuid(getuid()); 35 nice(0); 36 execl("/bin/csh", "-", 0); 37 syserr("cannot execute /bin/csh"); 38 } 39 sav2 = signal(2, 1); 40 sav3 = signal(3, 1); 41 while (wait(&i) != pid) ; 42 signal(2, sav2); 43 signal(3, sav3); 44 } 45