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