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