| 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) %G%"; |
| 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 | } |