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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
*
* This program 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 of the
* License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Authors: William Jon McCann <mccann@jhu.edu>
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <X11/Xlib.h>
#include <glib.h>
static void
print_peer_pid (int fd)
{
#ifdef SO_PEERCRED
struct ucred cr;
socklen_t cr_len;
cr_len = sizeof (cr);
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 && cr_len == sizeof (cr)) {
/* paranoia check for peer running as root */
if (cr.uid == 0) {
printf ("%u\n", cr.pid);
}
} else {
g_warning ("Failed to getsockopt() credentials, returned len %d/%d: %s\n",
cr_len,
(int) sizeof (cr),
g_strerror (errno));
}
#endif
}
static Display *
display_init (int *argc, char ***argv)
{
const char *display_name;
Display *xdisplay;
display_name = g_getenv ("DISPLAY");
if (display_name == NULL) {
g_warning ("DISPLAY is not set");
exit (1);
}
xdisplay = XOpenDisplay (display_name);
if (xdisplay == NULL) {
g_warning ("cannot open display: %s", display_name ? display_name : "");
exit (1);
}
return xdisplay;
}
int
main (int argc,
char **argv)
{
int fd;
int ret;
Display *xdisplay;
ret = 1;
xdisplay = display_init (&argc, &argv);
fd = ConnectionNumber (xdisplay);
if (fd > 0) {
ret = 0;
print_peer_pid (fd);
}
return ret;
}
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