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/*
* grent.c - This file is part of the libc-8086/grp package for ELKS,
* Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* setgrent(), endgrent(), and getgrent() are mutually-dependent functions,
* so they are all included in the same object file, and thus all linked
* in together.
*/
#include <features.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include "config.h"
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
# define LOCK pthread_mutex_lock(&mylock)
# define UNLOCK pthread_mutex_unlock(&mylock);
#else
# define LOCK
# define UNLOCK
#endif
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
extern pthread_mutex_t __getgrent_lock;
# define GRENT_LOCK pthread_mutex_lock(&__getgrent_lock)
# define GRENT_UNLOCK pthread_mutex_unlock(&__getgrent_lock);
#else
# define GRENT_LOCK
# define GRENT_UNLOCK
#endif
static int grp_fd = -1;
static char *line_buff = NULL;
static char **members = NULL;
void setgrent(void)
{
LOCK;
if (grp_fd != -1)
close(grp_fd);
grp_fd = open(_PATH_GROUP, O_RDONLY);
UNLOCK;
}
void endgrent(void)
{
LOCK;
if (grp_fd != -1)
close(grp_fd);
grp_fd = -1;
UNLOCK;
}
struct group *getgrent(void)
{
struct group *r;
LOCK;
if (grp_fd == -1) {
UNLOCK;
return NULL;
}
UNLOCK;
GRENT_LOCK;
r = __getgrent(grp_fd, line_buff, members);
GRENT_UNLOCK;
return r;
}
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