[libglnx] glnx-fdio: Add wrappers around fstat() and fstatat() to handle errors

[Colin Walters <walters src gnome org>]

commit 2b82858169186d2758c5fe60ad1099eab7f46a25
Author: Philip Withnall <withnall endlessm com>
Date:   Fri Apr 21 13:14:47 2017 +0100

    glnx-fdio: Add wrappers around fstat() and fstatat() to handle errors
    
    Add two inline wrappers around fstat() and fstatat() which handle
    retrying on EINTR and return other errors using GError, to be consistent
    with other glnx functions.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glnx-fdio.h |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 51 insertions(+), 0 deletions(-)
---
diff --git a/glnx-fdio.h b/glnx-fdio.h
index c3e7573..56d0b78 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -35,6 +35,8 @@
 #include <libgen.h>
 #undef basename
 
+#include <glnx-errors.h>
+
 G_BEGIN_DECLS
 
 /* Irritatingly, g_basename() which is what we want
@@ -155,5 +157,54 @@ int glnx_renameat2_noreplace (int olddirfd, const char *oldpath,
 int glnx_renameat2_exchange (int olddirfd, const char *oldpath,
                              int newdirfd, const char *newpath);
 
+/**
+ * glnx_fstat:
+ * @fd: FD to stat
+ * @buf: (out caller-allocates): Return location for stat details
+ * @error: Return location for a #GError, or %NULL
+ *
+ * Wrapper around fstat() which adds #GError support and ensures that it retries
+ * on %EINTR.
+ *
+ * Returns: %TRUE on success, %FALSE otherwise
+ * Since: UNRELEASED
+ */
+static inline gboolean
+glnx_fstat (int           fd,
+            struct stat  *buf,
+            GError      **error)
+{
+  if (TEMP_FAILURE_RETRY (fstat (fd, buf)) != 0)
+    return glnx_throw_errno (error);
+
+  return TRUE;
+}
+
+/**
+ * glnx_fstatat:
+ * @dfd: Directory FD to stat beneath
+ * @path: Path to stat beneath @dfd
+ * @buf: (out caller-allocates): Return location for stat details
+ * @flags: Flags to pass to fstatat()
+ * @error: Return location for a #GError, or %NULL
+ *
+ * Wrapper around fstatat() which adds #GError support and ensures that it
+ * retries on %EINTR.
+ *
+ * Returns: %TRUE on success, %FALSE otherwise
+ * Since: UNRELEASED
+ */
+static inline gboolean
+glnx_fstatat (int           dfd,
+              const gchar  *path,
+              struct stat  *buf,
+              int           flags,
+              GError      **error)
+{
+  if (TEMP_FAILURE_RETRY (fstatat (dfd, path, buf, flags)) != 0)
+    return glnx_throw_errno (error);
+
+  return TRUE;
+}
 
 G_END_DECLS