From 81e8b3a78b680143e315b4380d794a25fefc9e32 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sun, 22 Nov 2015 23:07:39 -0500
Subject: driver integration 8/9: driver code: initial implementation.

---
 src/driver/pe_unit_ctx.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/driver/pe_unit_ctx.c

(limited to 'src/driver/pe_unit_ctx.c')

diff --git a/src/driver/pe_unit_ctx.c b/src/driver/pe_unit_ctx.c
new file mode 100644
index 0000000..5bcac3d
--- /dev/null
+++ b/src/driver/pe_unit_ctx.c
@@ -0,0 +1,52 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <perk/perk.h>
+
+static int pe_free_unit_ctx_impl(struct pe_unit_ctx * ctx, int status)
+{
+	if (ctx) {
+		pe_free_image_meta(ctx->meta);
+		pe_unmap_raw_image(&ctx->map);
+		free(ctx);
+	}
+
+	return status;
+}
+
+int pe_get_unit_ctx(
+	struct pe_driver_ctx *	dctx,
+	const char *		path,
+	struct pe_unit_ctx **	pctx)
+{
+	struct pe_unit_ctx *	ctx;
+	int			prot;
+
+	if (!dctx || !(ctx = calloc(sizeof(*ctx),1)))
+		return -1;
+
+	prot = (dctx->cctx.actflags & PERK_ACTION_FLAG_MAP_READWRITE)
+		? PROT_READ | PROT_WRITE
+		: PROT_READ;
+
+	if (pe_map_raw_image(dctx->cctx.fdin,path,prot,&ctx->map))
+		return pe_free_unit_ctx_impl(ctx,-1);
+
+	if (pe_get_image_meta(&ctx->map,&ctx->meta))
+		return pe_free_unit_ctx_impl(ctx,-1);
+
+	memcpy(&ctx->cctx,&dctx->cctx,
+		sizeof(ctx->cctx));
+
+	ctx->path	= path;
+	ctx->cctx.prot	= prot;
+
+	*pctx = ctx;
+	return 0;
+}
+
+void pe_free_unit_ctx(struct pe_unit_ctx * ctx)
+{
+	pe_free_unit_ctx_impl(ctx,0);
+}
-- 
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