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 this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #ifndef lint 14 char copyright[] = 15 "@(#) Copyright (c) 1988 Regents of the University of California.\n\ 16 All rights reserved.\n"; 17 #endif /* not lint */ 18 19 #ifndef lint 20 static char sccsid[] = "@(#)whoami.c 5.2 (Berkeley) 06/09/88"; 21 #endif /* not lint */ 22 23 #include <sys/types.h> 24 #include <pwd.h> 25 26 main() 27 { 28 struct passwd *p, *getpwuid(); 29 uid_t uid; 30 31 uid = geteuid(); 32 if (!(p = getpwuid(uid))) { 33 printf("whoami: no login associated with uid %u.\n", uid); 34 exit(1); 35 } 36 printf("%s\n", p->pw_name); 37 exit(0); 38 } 39