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Commit	Line	Data
	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: 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
	48	extern int __getlogin(char *, int);
	49
	50	__private_extern__ pthread_mutex_t __logname_mutex = PTHREAD_MUTEX_INITIALIZER;
	51	__private_extern__ char *__logname = NULL;
	52
	53	static char *
	54	getlogin_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
	74	char *
	75	getlogin(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
	86	int
	87	getlogin_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	}