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pktsetup.c

/*
 * Copyright (c) 1999,2000    Jens Axboe <axboe@suse.de>
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <getopt.h>
#include <bits/types.h>
#include <sys/types.h>

#include <linux/cdrom.h>

/*
 * if we don't have one, we probably have neither
 */
#ifndef PACKET_SETUP_DEV
#define PACKET_SETUP_DEV      _IOW('X', 1, unsigned int)
#define PACKET_TEARDOWN_DEV   _IOW('X', 2, unsigned int)
#endif

int init_cdrom(int fd)
{
      if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) < 0) {
            perror("drive not ready\n");
            return 1;
      }

      if (ioctl(fd, CDROM_DISC_STATUS, CDSL_CURRENT) < 0) {
            perror("no disc inserted?\n");
            return 1;
      }

      /*
       * we don't care what disc type the uniform layer thinks it
       * is, since it may get it wrong. what matters is that the above
       * will force a TOC read.
       */
      return 0;
}

void setup_dev(char *pkt_device, char *device, int rem)
{
      int pkt_fd, dev_fd, cmd;

      if ((pkt_fd = open(pkt_device, O_RDONLY | O_CREAT)) == -1) {
            perror("open packet device");
            return;
      }

      if (!rem) {
            cmd = PACKET_SETUP_DEV;
            if ((dev_fd = open(device, O_RDONLY | O_NONBLOCK)) == -1) {
                  perror("open cd-rom");
                  close(pkt_fd);
                  return;
            }
            if (init_cdrom(dev_fd)) {
                  close(pkt_fd);
                  close(dev_fd);
                  return;
            }
      } else {
            cmd = PACKET_TEARDOWN_DEV;
            dev_fd = 0; /* silence gcc */
      }
            
      if (ioctl(pkt_fd, cmd, dev_fd) == -1)
            perror("ioctl");

      if (dev_fd)
            close(dev_fd);
      close(pkt_fd);
}

int usage(void)
{
      printf("pktsetup /dev/pktcdvd0 /dev/cdrom\tsetup device\n");
      printf("pktsetup -d /dev/pktcdvd0\t\ttear down device\n");
      return 1;
}

int main(int argc, char **argv)
{
      int rem = 0, c;

      if (argc == 1)
            return usage();

      while ((c = getopt(argc, argv, "d")) != EOF) {
            switch (c) {
                  case 'd':
                        rem = 1;
                        break;
                  default:
                        return usage();
            }
      }
      setup_dev(argv[optind], argv[optind + 1], rem);
      return 0;
}

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