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/* $OpenBSD: getlogin.c,v 1.11 2005/10/19 19:10:32 deraadt Exp $ */
/*
* 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/param.h>
#include <pwd.h>
#include <utmp.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "thread_private.h"
_THREAD_PRIVATE_MUTEX(logname);
static int logname_valid = 0;
static char logname[MAXLOGNAME + 1];
int _getlogin(char *, size_t);
int _setlogin(const char *);
char *
getlogin(void)
{
_THREAD_PRIVATE_KEY(getlogin);
char * name = (char *)_THREAD_PRIVATE(getlogin, logname, NULL);
if ((errno = getlogin_r(name, sizeof logname)) != 0)
return NULL;
if (*name == '\0') {
errno = ENOENT; /* well? */
return NULL;
}
return name;
}
int
getlogin_r(char *name, size_t namelen)
{
int logname_size;
_THREAD_PRIVATE_MUTEX_LOCK(logname);
if (!logname_valid) {
if (_getlogin(logname, sizeof(logname) - 1) < 0) {
_THREAD_PRIVATE_MUTEX_UNLOCK(logname);
return errno;
}
logname_valid = 1;
logname[MAXLOGNAME] = '\0'; /* paranoia */
}
logname_size = strlen(logname) + 1;
if (namelen < logname_size) {
_THREAD_PRIVATE_MUTEX_UNLOCK(logname);
return ERANGE;
}
memcpy(name, logname, logname_size);
_THREAD_PRIVATE_MUTEX_UNLOCK(logname);
return 0;
}
int
setlogin(const char *name)
{
int ret;
_THREAD_PRIVATE_MUTEX_LOCK(logname);
ret = _setlogin(name);
if (ret == 0)
logname_valid = 0;
_THREAD_PRIVATE_MUTEX_UNLOCK(logname);
return ret;
}
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