[mutter/gnome-3-24] backends: Set error when opening /sys file fails

[Carlos Garnacho <carlosg src gnome org>]

commit 0159efe34bfda8acd58aab31ff49b6012e5ed700
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 12 22:36:42 2017 +0200

    backends: Set error when opening /sys file fails
    
    The caller in clutter really expects an error if fd==-1, so make
    sure we set one here. Otherwise we get a nice crash in addition to
    the failure to open the /sys file. Also, retry on EINTR.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784881

 src/backends/native/meta-launcher.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/src/backends/native/meta-launcher.c b/src/backends/native/meta-launcher.c
index 4a9a727..90b4b98 100644
--- a/src/backends/native/meta-launcher.c
+++ b/src/backends/native/meta-launcher.c
@@ -188,9 +188,22 @@ on_evdev_device_open (const char  *path,
   /* Allow readonly access to sysfs */
   if (g_str_has_prefix (path, "/sys/"))
     {
-      fd = open (path, flags);
-      if (fd >= 0)
-        g_hash_table_add (self->sysfs_fds, GINT_TO_POINTER (fd));
+      do
+        {
+          fd = open (path, flags);
+        }
+      while (fd < 0 && errno == EINTR);
+
+      if (fd < 0)
+        {
+          g_set_error (error,
+                       G_FILE_ERROR,
+                       g_file_error_from_errno (errno),
+                       "Could not open /sys file: %s: %m", path);
+          return -1;
+        }
+
+      g_hash_table_add (self->sysfs_fds, GINT_TO_POINTER (fd));
       return fd;
     }