move process code into proc. add panic folder

1 files changed, 23 insertions, 0 deletions

diff --git a/sys/link.c b/sys/link.c
index 592fe8f..45c118a 100644
--- a/sys/link.c
+++ b/sys/link.c
@@ -1,6 +1,8 @@
 #include "link.h"
 #include "arch/x86_64/hal/obj.h"
 #include "hal/memory.h"
+#include "lib/printf.h"
+#include "jove.h"
 
 uint8_t 
 link_gettype(jove_owned_obj_t *obj)
@@ -57,6 +59,27 @@ link_try_traverse(jove_owned_obj_t *link, lockstack_t *lockstack)
     return perm_obj;
 }
 
+jove_perm_obj_t
+link_try_traverse_objdir(jove_owned_obj_t *objdir, lockstack_t *lockstack,
+        size_t pathlen, objpath_part_t *path)
+{
+    /*Do a traversal through the passed objdir to get objdir permissions.*/
+    jove_perm_obj_t perm_obj = link_try_traverse(objdir, lockstack);
+    if(perm_obj.obj == 0) return perm_obj;
+    if(pathlen == 0) return perm_obj;
+    
+    /*Get the object pointed to by the head of the path. */
+    perm_obj.obj = lockstack_push(lockstack, objdir_trygetlocal(perm_obj.obj, path[0]));
+    if(pathlen > 1) lockstack_pop(lockstack); /*Don't lock the directory we're traversing. */
+
+    /*Recurse through the remaining path, resolving as we go. */
+    jove_perm_obj_t traverse_obj = link_try_traverse_objdir(perm_obj.obj, lockstack, pathlen - 1, &path[1]);
+
+    /*Mask permissions against the head object. */
+    traverse_obj.permissions &= perm_obj.permissions;
+    return traverse_obj;
+}
+
 jove_owned_obj_t *link_new(jove_obj_t *tgt, jove_owned_obj_t *dst, uint16_t permissions)
 {
     struct obj_link *linkval = obj_deref(dst);