Fixes: debbugs:19175

* gtkutil.c (xg_display_open):
* xterm.c (x_display_ok, x_term_init): Block SIGIO when opening
a display.

src/ChangeLog

+2015-03-29  Jan Djärv  <jan.h.d@swipnet.se>
+
+	* gtkutil.c (xg_display_open):
+	* xterm.c (x_display_ok, x_term_init): Block SIGIO when opening
+	a display (Bug#19175).
+
 2015-04-01  Nicolas Petton  <nicolas@petton.fr>
 
 	* Version 24.5 released.

src/gtkutil.c

@@ -167,7 +167,9 @@ xg_display_open (char *display_name, Display **dpy)
 {
   GdkDisplay *gdpy;
 
+  unrequest_sigio ();  // See comment in x_display_ok, xterm.c.
   gdpy = gdk_display_open (display_name);
+  request_sigio ();
   if (!gdpy_def && gdpy)
     {
       gdpy_def = gdpy;

src/xterm.c

@@ -9719,7 +9719,11 @@ get_bits_and_offset (unsigned long mask, int *bits, int *offset)
 bool
 x_display_ok (const char *display)
 {
-  Display *dpy = XOpenDisplay (display);
+  Display *dpy;
+  // XOpenDisplay fails if it gets a signal.  Block SIGIO which may arrive.
+  unrequest_sigio ();
+  dpy = XOpenDisplay (display);
+  request_sigio ();
   return dpy ? (XCloseDisplay (dpy), 1) : 0;
 }
 
@@ -9811,7 +9815,9 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
 
         /* gtk_init does set_locale.  Fix locale before and after.  */
         fixup_locale ();
+        unrequest_sigio (); // See comment in x_display_ok.
         gtk_init (&argc, &argv2);
+        request_sigio ();
         fixup_locale ();
 
         g_log_remove_handler ("GLib", id);
@@ -9861,10 +9867,12 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
 	argv[argc++] = xrm_option;
       }
     turn_on_atimers (0);
+    unrequest_sigio ();  // See comment in x_display_ok.
     dpy = XtOpenDisplay (Xt_app_con, SSDATA (display_name),
 			 resource_name, EMACS_CLASS,
 			 emacs_options, XtNumber (emacs_options),
 			 &argc, argv);
+    request_sigio ();
     turn_on_atimers (1);
 
 #ifdef HAVE_X11XTR6
@@ -9875,7 +9883,9 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
 
 #else /* not USE_X_TOOLKIT */
   XSetLocaleModifiers ("");
+  unrequest_sigio ();  // See comment in x_display_ok.
   dpy = XOpenDisplay (SSDATA (display_name));
+  request_sigio ();
 #endif /* not USE_X_TOOLKIT */
 #endif /* not USE_GTK*/