Initial userspace library version

1 files changed, 37 insertions, 0 deletions

diff --git a/userspace/ncrypto_fd.c b/userspace/ncrypto_fd.c
new file mode 100644
index 0000000..fe35529
--- /dev/null
+++ b/userspace/ncrypto_fd.c
@@ -0,0 +1,37 @@
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include "../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)) < 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);
+}
+