1 /* 2 * Copyright (c) 1988 The 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)getlogin.c 5.4 (Berkeley) 03/07/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <sys/types.h> 23 #include <stdio.h> 24 #include <pwd.h> 25 #include <utmp.h> 26 27 static char logname[UT_NAMESIZE+1]; 28 29 char * 30 getlogin() 31 { 32 static int notcalled = 1; 33 34 if (notcalled) { 35 if(getlogname(logname, sizeof(logname) - 1) < 0) 36 return((char *) 0); 37 notcalled = 0; 38 } 39 return(logname); 40 } 41 42 uid_t geteuid(); 43 44 char * 45 cuserid(s) 46 char *s; 47 { 48 register struct passwd *pwd; 49 50 if((pwd = getpwuid(geteuid())) == NULL) { 51 if(s) 52 *s = '\0'; 53 return(NULL); 54 } 55 if(s) { 56 (void) strncpy(s, pwd->pw_name, L_cuserid); 57 return(s); 58 } 59 return(pwd->pw_name); 60 } 61