open(2): POSIX compatibility.

Posix allows for open(2) to fail with errno = EINTR.
Normal this isn't seen when opening files. However in some case we are
opening a fifo for write which will block until another process opens it
for read. If a signal is received while blocked, open(2) fails with
errno = EINTR.

https://bugzilla.gnome.org/show_bug.cgi?id=656492

glib/giounix.c

@@ -524,7 +524,13 @@ g_io_channel_new_file (const gchar *filename,
     }
 
   create_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+
+  do
+    {
       fid = open (filename, flags, create_mode);
+    }
+  while (fid == -1 && errno == EINTR);
+
   if (fid == -1)
     {
       int err = errno;