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/* communications.c -- Send commands to a running copy of ratpoison.
* Copyright (C) 2000, 2001, 2002, 2003, 2004 Shawn Betts <sabetts@vcn.bc.ca>
*
* This file is part of ratpoison.
*
* ratpoison is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* ratpoison is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/Xproto.h>
#include <string.h>
#include "ratpoison.h"
/* Sending commands to ratpoison */
static int
receive_command_result (Window w)
{
int query;
int return_status = RET_FAILURE;
Atom type_ret;
int format_ret;
unsigned long nitems;
unsigned long bytes_after;
unsigned char *result = NULL;
/* First, find out how big the property is. */
query = XGetWindowProperty (dpy, w, rp_command_result,
0, 0, False, xa_string,
&type_ret, &format_ret, &nitems, &bytes_after,
&result);
/* Failed to retrieve property. */
if (query != Success || result == NULL)
{
PRINT_DEBUG (("failed to get command result length\n"));
return return_status;
}
/* XGetWindowProperty always allocates one extra byte even if
the property is zero length. */
XFree (result);
/* Now that we have the length of the message, we can get the
whole message. */
query = XGetWindowProperty (dpy, w, rp_command_result,
0, (bytes_after / 4) + (bytes_after % 4 ? 1 : 0),
True, xa_string, &type_ret, &format_ret, &nitems,
&bytes_after, &result);
/* Failed to retrieve property. */
if (query != Success || result == NULL)
{
PRINT_DEBUG (("failed to get command result\n"));
return return_status;
}
/*
* We can receive:
* - an empty string, indicating a success but no output
* - a string starting with '0', indicating a success and an output
* - a string starting with '1', indicating a failure and an optional output
*/
switch (result[0])
{
case '\0': /* Command succeeded but no string to print */
return_status = RET_SUCCESS;
break;
case '0': /* Command failed, don't print an empty line if no explanation
was given */
if (result[1] != '\0')
fprintf (stderr, "%s\n", &result[1]);
return_status = RET_FAILURE;
break;
case '1': /* Command succeeded, print the output */
printf ("%s\n", &result[1]);
return_status = RET_SUCCESS;
default: /* We probably got junk, so ignore it */
return_status = RET_FAILURE;
}
/* Free the result. */
XFree (result);
return return_status;
}
int
send_command (unsigned char interactive, unsigned char *cmd, int screen_num)
{
Window w, root;
int done = 0, return_status = RET_FAILURE;
struct sbuf *s;
s = sbuf_new(0);
sbuf_printf(s, "%c%s", interactive, cmd);
/* If the user specified a specific screen, then send the event to
that screen. */
if (screen_num >= 0)
root = RootWindow (dpy, screen_num);
else
root = DefaultRootWindow (dpy);
w = XCreateSimpleWindow (dpy, root, 0, 0, 1, 1, 0, 0, 0);
/* Select first to avoid race condition */
XSelectInput (dpy, w, PropertyChangeMask);
XChangeProperty (dpy, w, rp_command, xa_string,
8, PropModeReplace, (unsigned char*)sbuf_get(s), strlen ((char *)cmd) + 2);
XChangeProperty (dpy, root,
rp_command_request, XA_WINDOW,
8, PropModeAppend, (unsigned char *)&w, sizeof (Window));
sbuf_free (s);
while (!done)
{
XEvent ev;
XMaskEvent (dpy, PropertyChangeMask, &ev);
if (ev.xproperty.atom == rp_command_result
&& ev.xproperty.state == PropertyNewValue)
{
return_status = receive_command_result(ev.xproperty.window);
done = 1;
}
}
XDestroyWindow (dpy, w);
return return_status;
}
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