seitan: Add netlink, sendto()/sendmsg(), iovec handling, demo with routes

A bit rough at the moment, but it does the trick. Bonus: setsockopt()
(with magic values only, not used in any demo yet).

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 13 insertions, 3 deletions

diff --git a/cooker/gluten.c b/cooker/gluten.c
index 4d3aea5..69c9384 100644
--- a/cooker/gluten.c
+++ b/cooker/gluten.c
@@ -146,6 +146,7 @@ void gluten_add_attr(struct gluten_ctx *g, enum attr_type type, intptr_t id,
 union value gluten_get_attr(struct gluten_ctx *g, enum attr_type type,
 			    intptr_t id)
 {
+	union value missing = { 0 };
 	int i;
 
 	for (i = 0; i < ATTRS_MAX && g->attrs[i].type; i++) {
@@ -153,8 +154,8 @@ union value gluten_get_attr(struct gluten_ctx *g, enum attr_type type,
 			return g->attrs[i].v;
 	}
 
-	die("   attribute '%p' not found", id);
-	return g->attrs[0].v;		/* Pro forma, not actually happening */
+	debug("   attribute '%p' not found", id);
+	return missing;
 }
 
 /**
@@ -163,8 +164,8 @@ union value gluten_get_attr(struct gluten_ctx *g, enum attr_type type,
  */
 void gluten_init(struct gluten_ctx *g)
 {
-	g->ip.type = g->lr.type = g->mr.type = OFFSET_INSTRUCTION;
 	g->ip.offset = g->lr.offset = g->mr.offset = 0;
+	g->ip.type = g->lr.type = g->mr.type = OFFSET_INSTRUCTION;
 	g->dp.type = OFFSET_DATA;
 	g->cp.type = OFFSET_RO_DATA;
 }
@@ -185,3 +186,12 @@ void gluten_write(struct gluten_ctx *g, const char *path)
 
 	close(fd);
 }
+
+void gluten_relocation_add(struct gluten_ctx *g, struct gluten_offset offset)
+{
+	g->g.header.relocation[g->rel_count++] = offset;
+	debug("   Added relocation for %s: %u", gluten_offset_name[offset.type],
+	      offset.offset);
+	if (g->rel_count >= 256)
+		die("Too many relocations");
+}