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) 31static 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: src/lib/libc/gen/getlogin.c,v 1.11 2009/12/05 19:04:21 ed Exp $"); 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 48extern int __getlogin(char *, int); 49 50__private_extern__ pthread_mutex_t __logname_mutex = PTHREAD_MUTEX_INITIALIZER; 51__private_extern__ char *__logname = NULL; 52 53static char * 54getlogin_basic(int *status) 55{ 56 if (__logname == NULL) { 57 __logname = calloc(1, MAXLOGNAME); 58 if (__logname == NULL) { 59 *status = ENOMEM; 60 return (NULL); 61 } 62 } 63 64 if (__logname[0] == 0) { 65 if (__getlogin(__logname, MAXLOGNAME) < 0) { 66 *status = errno; 67 return (NULL); 68 } 69 } 70 *status = 0; 71 return (*__logname ? __logname : NULL); 72} 73 74char * 75getlogin(void) 76{ 77 char *result; 78 int status; 79 80 pthread_mutex_lock(&__logname_mutex); 81 result = getlogin_basic(&status); 82 pthread_mutex_unlock(&__logname_mutex); 83 return (result); 84} 85 86int 87getlogin_r(char *logname, size_t namelen) 88{ 89 char *result; 90 int len; 91 int status; 92 93 pthread_mutex_lock(&__logname_mutex); 94 result = getlogin_basic(&status); 95 if (status == 0) { 96 if (strlcpy(logname, __logname, namelen) > namelen) { 97 status = ERANGE; 98 } 99 } 100 pthread_mutex_unlock(&__logname_mutex); 101 102 return (status); 103} 104