gtk/gdk/linux-fb/gdkfbswitch.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2001 Alexander Larsson
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <config.h>
#include <glib.h>

#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#include "gdkfbmanager.h"

int
main (int argc, char *argv[])
{
  int fd;
  struct sockaddr_un addr;
  struct msghdr msg = {0};
  struct cmsghdr *cmsg;
  struct ucred credentials;
  struct FBManagerMessage init_msg;
  struct iovec iov;
  char buf[CMSG_SPACE (sizeof (credentials))];  /* ancillary data buffer */
  int *fdptr;
  int res;

  if (argc != 2)
    {
      g_print ("usage: fbswitch <pid>\n");
      return 1;
    }

  fd = socket (PF_UNIX, SOCK_STREAM, 0);
  
  if (fd < 0)
    return 1;

  addr.sun_family = AF_UNIX;
  strcpy (addr.sun_path, "/tmp/.fb.manager");

  if (connect(fd, (struct sockaddr *)&addr, sizeof (addr)) < 0) 
    {
      g_print ("connect failed\n");
      close (fd);
      return 1;
    }
  
  credentials.pid = getpid ();
  credentials.uid = geteuid ();
  credentials.gid = getegid ();

  init_msg.msg_type = FB_MANAGER_NEW_CLIENT;
  iov.iov_base = &init_msg;
  iov.iov_len = sizeof (init_msg);

  msg.msg_name = NULL;
  msg.msg_namelen = 0;
  msg.msg_iov = &iov;
  msg.msg_iovlen = 1;
  msg.msg_control = buf;
  msg.msg_controllen = sizeof buf;
  cmsg = CMSG_FIRSTHDR(&msg);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SCM_CREDENTIALS;
  cmsg->cmsg_len = CMSG_LEN (sizeof (credentials));
  /* Initialize the payload: */
  fdptr = (int *)CMSG_DATA (cmsg);
  memcpy (fdptr, &credentials, sizeof (credentials));
  /* Sum of the length of all control messages in the buffer: */
  msg.msg_controllen = cmsg->cmsg_len;

  res = sendmsg (fd, &msg, 0);

  init_msg.msg_type = FB_MANAGER_REQUEST_SWITCH_TO_PID;
  init_msg.data = atoi (argv[1]);
  /* Request a switch-to */
  send (fd, &init_msg, sizeof (init_msg), 0);
  g_print ("requested a switch to pid %d\n", init_msg.data);

  return 0;
}