From bb77dde5ddfba8fe0c819b18b547c2d710956502 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Thu, 21 Apr 2016 17:46:25 -0500
Subject: Have dirtree_recurse() take the new dirfd as an argument.

---
 lib/dirtree.c   | 12 +++++-------
 lib/lib.h       |  2 +-
 toys/posix/ls.c |  4 ++--
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/lib/dirtree.c b/lib/dirtree.c
index cc1ab90c..8f235ed4 100644
--- a/lib/dirtree.c
+++ b/lib/dirtree.c
@@ -110,12 +110,9 @@ struct dirtree *dirtree_handle_callback(struct dirtree *new,
   if (!callback) return new;
   flags = callback(new);
 
-  if (S_ISDIR(new->st.st_mode)) {
-    if (flags & (DIRTREE_RECURSE|DIRTREE_COMEAGAIN)) {
-      new->dirfd = openat(dirtree_parentfd(new), new->name, O_CLOEXEC);
-      flags = dirtree_recurse(new, callback, flags);
-    }
-  }
+  if (S_ISDIR(new->st.st_mode) && (flags & (DIRTREE_RECURSE|DIRTREE_COMEAGAIN)))
+    flags = dirtree_recurse(new, callback,
+      openat(dirtree_parentfd(new), new->name, O_CLOEXEC), flags);
 
   // If this had children, it was callback's job to free them already.
   if (!(flags & DIRTREE_SAVE)) {
@@ -130,12 +127,13 @@ struct dirtree *dirtree_handle_callback(struct dirtree *new,
 // callback(). Uses and closes supplied ->dirfd.
 
 int dirtree_recurse(struct dirtree *node,
-          int (*callback)(struct dirtree *node), int flags)
+          int (*callback)(struct dirtree *node), int dirfd, int flags)
 {
   struct dirtree *new, **ddt = &(node->child);
   struct dirent *entry;
   DIR *dir;
 
+  node->dirfd = dirfd;
   if (node->dirfd == -1 || !(dir = fdopendir(node->dirfd))) {
     if (!(flags & DIRTREE_SHUTUP)) {
       char *path = dirtree_path(node, 0);
diff --git a/lib/lib.h b/lib/lib.h
index 23a3b2b3..aafa9693 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -84,7 +84,7 @@ char *dirtree_path(struct dirtree *node, int *plen);
 int dirtree_notdotdot(struct dirtree *catch);
 int dirtree_parentfd(struct dirtree *node);
 int dirtree_recurse(struct dirtree *node, int (*callback)(struct dirtree *node),
-  int symfollow);
+  int dirfd, int symfollow);
 struct dirtree *dirtree_flagread(char *path, int flags,
   int (*callback)(struct dirtree *node));
 struct dirtree *dirtree_read(char *path, int (*callback)(struct dirtree *node));
diff --git a/toys/posix/ls.c b/toys/posix/ls.c
index bec76e99..2ebc062a 100644
--- a/toys/posix/ls.c
+++ b/toys/posix/ls.c
@@ -337,8 +337,8 @@ static void listfiles(int dirfd, struct dirtree *indir)
   } else {
     // Read directory contents. We dup() the fd because this will close it.
     // This reads/saves contents to display later, except for in "ls -1f" mode.
-    indir->dirfd = dup(dirfd);
-    dirtree_recurse(indir, filter, DIRTREE_SYMFOLLOW*!!(flags&FLAG_L));
+    dirtree_recurse(indir, filter, dup(dirfd),
+      DIRTREE_SYMFOLLOW*!!(flags&FLAG_L));
   }
 
   // Copy linked list to array and sort it. Directories go in array because
-- 
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