103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getlogin.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <errno.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "namespace.h"
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#define THREAD_LOCK() if (__isthreaded) _pthread_mutex_lock(&logname_mutex)
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#define THREAD_UNLOCK() if (__isthreaded) _pthread_mutex_unlock(&logname_mutex)
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extern int _getlogin(char *, int);
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int _logname_valid; /* known to setlogin() */
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static pthread_mutex_t logname_mutex = PTHREAD_MUTEX_INITIALIZER;
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static char *
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getlogin_basic(int *status)
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{
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static char logname[MAXLOGNAME];
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if (_logname_valid == 0) {
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if (_getlogin(logname, sizeof(logname)) < 0) {
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*status = errno;
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return (NULL);
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}
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_logname_valid = 1;
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}
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*status = 0;
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return (*logname ? logname : NULL);
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}
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char *
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getlogin(void)
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{
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char *result;
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int status;
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THREAD_LOCK();
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result = getlogin_basic(&status);
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THREAD_UNLOCK();
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return (result);
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}
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int
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getlogin_r(char *logname, int namelen)
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{
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char *result;
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int len;
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int status;
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THREAD_LOCK();
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result = getlogin_basic(&status);
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if (status == 0) {
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if ((len = strlen(result) + 1) > namelen)
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status = ERANGE;
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else
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strncpy(logname, result, len);
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}
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THREAD_UNLOCK();
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return (status);
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}
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