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/* $NetBSD: getlogin.c,v 1.15 2009/01/11 02:46:27 christos Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getlogin.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getlogin.c,v 1.15 2009/01/11 02:46:27 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <pwd.h>
#include <utmp.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "reentrant.h"
#include "extern.h"
#ifdef __weak_alias
__weak_alias(getlogin,_getlogin)
__weak_alias(getlogin_r,_getlogin_r)
#if !defined(__minix)
__weak_alias(setlogin,_setlogin)
#endif /* !defined(__minix) */
#endif
int __logname_valid; /* known to setlogin() */
static char logname[MAXLOGNAME + 1];
#ifdef _REENTRANT
static mutex_t logname_mutex = MUTEX_INITIALIZER;
#endif
char *
getlogin(void)
{
char *rv;
mutex_lock(&logname_mutex);
if (__logname_valid == 0) {
if (__getlogin(logname, sizeof(logname) - 1) < 0) {
mutex_unlock(&logname_mutex);
return ((char *)NULL);
}
__logname_valid = 1;
}
rv = (*logname ? logname : (char *)NULL);
mutex_unlock(&logname_mutex);
return rv;
}
int
getlogin_r(char *name, size_t namelen)
{
size_t len;
int rv;
mutex_lock(&logname_mutex);
if (__logname_valid == 0) {
if (__getlogin(logname, sizeof(logname) - 1) < 0) {
rv = errno;
mutex_unlock(&logname_mutex);
return (rv);
}
__logname_valid = 1;
}
len = strlen(logname) + 1;
if (len > namelen) {
rv = ERANGE;
} else {
strncpy(name, logname, len);
rv = 0;
}
mutex_unlock(&logname_mutex);
return (rv);
}
#if !defined(__minix)
int
setlogin(const char *name)
{
int retval;
retval = __setlogin(name);
__logname_valid = 0;
return (retval);
}
#endif /* !defined(__minix) */
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