From 7a2499708b6aa0be5a67e4a75de66fb9c18516af Mon Sep 17 00:00:00 2001
From: Colin Walters <walters@verbum.org>
Date: Thu, 27 Feb 2014 11:46:49 -0500
Subject: fileutils: Add gs_file_open_dir_fd_at()

This will be used in the OSTree checkout code, where we want to
mkdir() and then open it.
---
 gsystem-file-utils.c | 28 ++++++++++++++++++++++++++++
 gsystem-file-utils.h |  6 ++++++
 2 files changed, 34 insertions(+)

diff --git a/gsystem-file-utils.c b/gsystem-file-utils.c
index 27e0e2d..545fb30 100644
--- a/gsystem-file-utils.c
+++ b/gsystem-file-utils.c
@@ -463,6 +463,34 @@ gs_file_open_dir_fd (GFile         *path,
   return TRUE;
 }
 
+/**
+ * gs_file_open_dir_fd_at:
+ * @parent_dfd: Parent directory file descriptor
+ * @name: Directory name
+ * @out_fd: (out): File descriptor for directory
+ * @cancellable: Cancellable
+ * @error: Error
+ *
+ * On success, sets @out_fd to a file descriptor for the directory
+ * that can be used with UNIX functions such as openat().
+ */
+gboolean
+gs_file_open_dir_fd_at (int            parent_dfd,
+                        const char    *name,
+                        int           *out_fd,
+                        GCancellable  *cancellable,
+                        GError       **error)
+{
+  /* Linux specific probably */
+  *out_fd = openat (parent_dfd, name, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC);
+  if (*out_fd == -1)
+    {
+      _set_error_from_errno (error);
+      return FALSE;
+    }
+  return TRUE;
+}
+
 /**
  * gs_file_open_in_tmpdir_at:
  * @tmpdir_fd: Directory to place temporary file
diff --git a/gsystem-file-utils.h b/gsystem-file-utils.h
index d1cfda2..f873746 100644
--- a/gsystem-file-utils.h
+++ b/gsystem-file-utils.h
@@ -75,6 +75,12 @@ gboolean gs_file_open_dir_fd (GFile         *path,
                               GCancellable  *cancellable,
                               GError       **error);
 
+gboolean gs_file_open_dir_fd_at (int            parent_dfd,
+                                 const char    *name,
+                                 int           *out_fd,
+                                 GCancellable  *cancellable,
+                                 GError       **error);
+
 gboolean gs_file_open_in_tmpdir_at (int                tmpdir_fd,
                                     int                mode,
                                     char             **out_name,
-- 
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