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/*
* Copyright 2010 Red Hat, Inc.
*
* 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 RED HAT, 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 RED HAT, INC. 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.
*
* Red Hat author: Jan Chadima <jchadima@redhat.com>
*/
#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <unistd.h>
#include <linux/ncr.h>
#include "ncrypto.h"
#include "ncrypto_internal.h"
int __ncr_file_descriptor = -1;
static int open_count = 0;
static pthread_mutex_t open_lock = PTHREAD_MUTEX_INITIALIZER;
int
__ncr_global_init()
{
int rv = 0;
/* Open the crypto device unles is not already initialized */
pthread_mutex_lock(&open_lock);
if ((__ncr_file_descriptor < 0) && ((__ncr_file_descriptor = open("/dev/crypto", O_RDWR|O_CLOEXEC)) < 0))
rv = -1;
else
++open_count;
pthread_mutex_unlock(&open_lock);
return rv;
}
int
ncr_global_init(unsigned int flags)
{
return __ncr_global_init();
}
void
ncr_global_deinit(void)
{
pthread_mutex_lock(&open_lock);
if (!--open_count && (__ncr_file_descriptor >= 0)) {
close(__ncr_file_descriptor);
__ncr_file_descriptor = -1;
}
pthread_mutex_unlock(&open_lock);
}
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