137086Skfall /* 237086Skfall * Copyright (c) 1988 The Regents of the University of California. 337086Skfall * All rights reserved. 437086Skfall * 537086Skfall * Redistribution and use in source and binary forms are permitted 637086Skfall * provided that the above copyright notice and this paragraph are 737086Skfall * duplicated in all such forms and that any documentation, 837086Skfall * advertising materials, and other materials related to such 937086Skfall * distribution and use acknowledge that the software was developed 1037086Skfall * by the University of California, Berkeley. The name of the 1137086Skfall * University may not be used to endorse or promote products derived 1237086Skfall * from this software without specific prior written permission. 1337086Skfall * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 1437086Skfall * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 1537086Skfall * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 1637086Skfall */ 1737086Skfall 1826558Sdonn #if defined(LIBC_SCCS) && !defined(lint) 19*38789Skarels static char sccsid[] = "@(#)getlogin.c 5.6 (Berkeley) 08/26/89"; 2037086Skfall #endif /* LIBC_SCCS and not lint */ 219193Ssam 2237086Skfall #include <sys/types.h> 2337086Skfall #include <stdio.h> 2437086Skfall #include <pwd.h> 259109Ssam #include <utmp.h> 269109Ssam 27*38789Skarels int _logname_valid; /* known to setlogin() */ 289109Ssam 299109Ssam char * 309109Ssam getlogin() 319109Ssam { 32*38789Skarels static char logname[UT_NAMESIZE+1]; 339109Ssam 34*38789Skarels if (_logname_valid == 0) { 35*38789Skarels if (_getlogin(logname, sizeof(logname) - 1) < 0) 36*38789Skarels return ((char *)NULL); 37*38789Skarels _logname_valid = 1; 389193Ssam } 39*38789Skarels return (*logname ? logname : (char *)NULL); 409109Ssam } 4137086Skfall 4237086Skfall uid_t geteuid(); 4337086Skfall 4437086Skfall char * 4537086Skfall cuserid(s) 46*38789Skarels char *s; 4737086Skfall { 4837086Skfall register struct passwd *pwd; 4937086Skfall 5037460Sbostic if ((pwd = getpwuid(geteuid())) == NULL) { 5137460Sbostic if (s) 5237086Skfall *s = '\0'; 53*38789Skarels return (s); 5437086Skfall } 5537460Sbostic if (s) { 5637460Sbostic (void)strncpy(s, pwd->pw_name, L_cuserid); 57*38789Skarels return (s); 5837086Skfall } 59*38789Skarels return (pwd->pw_name); 6037086Skfall } 61