userspace/ncrypto_fd.c


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#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <unistd.h>
#include <linux/ncr.h>
#include "ncrypto.h"

int __ncr_file_descriptor = -1;
static int open_count = 0;
static pthread_mutex_t open_lock = PTHREAD_MUTEX_INITIALIZER;

int
ncr_global_init(unsigned int flags)
{
	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;
}

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);
}