1 files changed, 61 insertions, 0 deletions
diff --git a/src/driver/tpax_unit_ctx.c b/src/driver/tpax_unit_ctx.c
new file mode 100644
index 0000000..a6a91b6
--- /dev/null
+++ b/src/driver/tpax_unit_ctx.c
@@ -0,0 +1,61 @@
+/******************************************************/
+/*  tpax: a topological pax implementation            */
+/*  Copyright (C) 2020  Z. Gilboa                     */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */
+/******************************************************/
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include <tpax/tpax.h>
+#include "tpax_driver_impl.h"
+#include "tpax_errinfo_impl.h"
+
+static int tpax_free_unit_ctx_impl(struct tpax_unit_ctx_impl * ctx, int ret)
+{
+	if (ctx) {
+		free(ctx);
+	}
+
+	return ret;
+}
+
+int tpax_get_unit_ctx(
+	const struct tpax_driver_ctx *	dctx,
+	const char *			path,
+	struct tpax_unit_ctx **		pctx)
+{
+	struct tpax_unit_ctx_impl *	ctx;
+
+	if (!dctx)
+		return TPAX_CUSTOM_ERROR(
+			dctx,TPAX_ERR_NULL_CONTEXT);
+
+	else if (!(ctx = calloc(1,sizeof(*ctx))))
+		return TPAX_BUFFER_ERROR(dctx);
+
+	tpax_driver_set_ectx(
+		dctx,0,path);
+
+	ctx->path	= path;
+	ctx->uctx.path	= &ctx->path;
+
+	*pctx = &ctx->uctx;
+
+	return 0;
+}
+
+void tpax_free_unit_ctx(struct tpax_unit_ctx * ctx)
+{
+	struct tpax_unit_ctx_impl *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct tpax_unit_ctx_impl,uctx);
+		ictx = (struct tpax_unit_ctx_impl *)addr;
+		tpax_free_unit_ctx_impl(ictx,0);
+	}
+}