1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getlogin.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <errno.h> 42 #include <pwd.h> 43 #include <utmp.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include "namespace.h" 48 #include <pthread.h> 49 #include "un-namespace.h" 50 51 #include "libc_private.h" 52 53 #define THREAD_LOCK() if (__isthreaded) _pthread_mutex_lock(&logname_mutex) 54 #define THREAD_UNLOCK() if (__isthreaded) _pthread_mutex_unlock(&logname_mutex) 55 56 extern int _getlogin(char *, int); 57 58 int _logname_valid; /* known to setlogin() */ 59 static pthread_mutex_t logname_mutex = PTHREAD_MUTEX_INITIALIZER; 60 61 static char * 62 getlogin_basic(int *status) 63 { 64 static char logname[MAXLOGNAME]; 65 66 if (_logname_valid == 0) { 67 if (_getlogin(logname, sizeof(logname)) < 0) { 68 *status = errno; 69 return (NULL); 70 } 71 _logname_valid = 1; 72 } 73 *status = 0; 74 return (*logname ? logname : NULL); 75 } 76 77 char * 78 getlogin(void) 79 { 80 char *result; 81 int status; 82 83 THREAD_LOCK(); 84 result = getlogin_basic(&status); 85 THREAD_UNLOCK(); 86 return (result); 87 } 88 89 int 90 getlogin_r(char *logname, int namelen) 91 { 92 char *result; 93 int len; 94 int status; 95 96 THREAD_LOCK(); 97 result = getlogin_basic(&status); 98 if (status == 0) { 99 if ((len = strlen(result) + 1) > namelen) 100 status = ERANGE; 101 else 102 strncpy(logname, result, len); 103 } 104 THREAD_UNLOCK(); 105 return (status); 106 } 107