1 files changed, 43 insertions, 0 deletions
diff --git a/sys/cmd/rc/sys.c b/sys/cmd/rc/sys.c
index d286c88..496c2e6 100644
--- a/sys/cmd/rc/sys.c
+++ b/sys/cmd/rc/sys.c
@@ -90,3 +90,46 @@ execute(Word *cmd, Word *path)
     efree(argv);
     fatal("could not execute command: %s\n", path->str);
 }
+
+void
+redirect(Redir *r)
+{
+    if(r){
+        redirect(r->link);
+        switch(r->type){
+        case Ropen:
+            if(r->from != r->to){
+            }
+            break;
+        case Rdup:
+            dup2(r->from, r->to); // TODO: error checking
+            break;
+        case Rclose:
+            close(r->from);
+            break;
+        default:
+            fatal("unrecognized redirection type %d\n", r->type);
+        }
+    }
+}
+
+int
+mapfd(int fd)
+{
+    Redir *r;
+    for(r = runner->redir.end; r; r = r->link){
+        switch(r->type){
+        case Rclose:
+            if(r->from == fd)
+                fd = -1;
+            break;
+        case Rdup:
+        case Ropen:
+            if(r->to == fd)
+                fd = r->from;
+            break;
+        }
+    }
+
+    return fd;
+}