1 /* 2 * Copyright (c) 1988 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 char copyright[] = 20 "@(#) Copyright (c) 1988 Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)whoami.c 5.3 (Berkeley) 06/29/88"; 26 #endif /* not lint */ 27 28 #include <sys/types.h> 29 #include <pwd.h> 30 31 main() 32 { 33 struct passwd *p, *getpwuid(); 34 uid_t uid; 35 36 uid = geteuid(); 37 if (!(p = getpwuid(uid))) { 38 printf("whoami: no login associated with uid %u.\n", uid); 39 exit(1); 40 } 41 printf("%s\n", p->pw_name); 42 exit(0); 43 } 44