[libglnx] fdio: Add a fchmod wrapper

[Colin Walters <walters src gnome org>]

commit 547bcea280b389b244d52bf052f627e31bf210a9
Author: Colin Walters <walters verbum org>
Date:   Tue Jul 11 10:32:11 2017 -0400

    fdio: Add a fchmod wrapper
    
    There are a number of versions of this in ostree at least, might as well wrap
    it.

 glnx-fdio.h |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/glnx-fdio.h b/glnx-fdio.h
index 601e793..d6352b2 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -242,6 +242,28 @@ glnx_fstat (int           fd,
 }
 
 /**
+ * glnx_fchmod:
+ * @fd: FD
+ * @mode: Mode
+ * @error: Return location for a #GError, or %NULL
+ *
+ * Wrapper around fchmod() which adds #GError support and ensures that it
+ * retries on %EINTR.
+ *
+ * Returns: %TRUE on success, %FALSE otherwise
+ * Since: UNRELEASED
+ */
+static inline gboolean
+glnx_fchmod (int           fd,
+             mode_t        mode,
+             GError      **error)
+{
+  if (TEMP_FAILURE_RETRY (fchmod (fd, mode)) != 0)
+    return glnx_throw_errno_prefix (error, "fchmod");
+  return TRUE;
+}
+
+/**
  * glnx_fstatat:
  * @dfd: Directory FD to stat beneath
  * @path: Path to stat beneath @dfd