bug#19175: 24.4; make-frame-on-display fails if emacs started with -nw

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 29 Mar 2015 19:09:48 +0200
> From: Jan Djärv <jan.h.d@swipnet.se>
> CC: mb@becroft.co.nz, 19175@debbugs.gnu.org
> 
> index fedaa0f..1f48262 100644
> --- a/src/gtkutil.c
> +++ b/src/gtkutil.c
> @@ -167,7 +167,9 @@ xg_display_open (char *display_name, Display **dpy)
>   {
>     GdkDisplay *gdpy;
> 
> +  unrequest_sigio ();
>     gdpy = gdk_display_open (display_name);
> +  request_sigio ();
>     if (!gdpy_def && gdpy)
>       {
>         gdpy_def = gdpy;
> diff --git a/src/xterm.c b/src/xterm.c
> index 4ca1e13..8284ed9 100644
> --- a/src/xterm.c
> +++ b/src/xterm.c
> @@ -9719,7 +9719,10 @@ get_bits_and_offset (unsigned long mask, int *bits, int 
> *offset)
>   bool
>   x_display_ok (const char *display)
>   {
> -  Display *dpy = XOpenDisplay (display);
> +  Display *dpy;
> +  unrequest_sigio ();
> +  dpy = XOpenDisplay (display);
> +  request_sigio ();
>     return dpy ? (XCloseDisplay (dpy), 1) : 0;
>   }
> 
> @@ -9811,7 +9814,9 @@ 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 ();
>           gtk_init (&argc, &argv2);
> +        request_sigio ();
>           fixup_locale ();
> 
>           g_log_remove_handler ("GLib", id);
> @@ -9861,10 +9866,12 @@ x_term_init (Lisp_Object display_name, char 
> *xrm_option, char *resource_name)
>          argv[argc++] = xrm_option;
>         }
>       turn_on_atimers (0);
> +    unrequest_sigio ();
>       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 +9882,9 @@ x_term_init (Lisp_Object display_name, char *xrm_option, 
> char *resource_name)
> 
>   #else /* not USE_X_TOOLKIT */
>     XSetLocaleModifiers ("");
> +  unrequest_sigio ();
>     dpy = XOpenDisplay (SSDATA (display_name));
> +  request_sigio ();
>   #endif /* not USE_X_TOOLKIT */
>   #endif /* not USE_GTK*/

Thanks, this looks safe enough to me.  Just add some comments to
explain the need.

I hope Nicolas won't mind preparing a new tarball for the release.