src/wmlib/plat_svr4.c

/*
 * This file is part of WorkMan, the civilized CD player library
 * Copyright (C) 1991-1997 by Steven Grimm <koreth@midwinter.com>
 * Copyright (C) by Dirk Försterling <milliByte@DeathsDoor.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 * SVR4 specific.  Much of this is similar to plat_hpux.c.
 */

#if (defined(SVR4) || defined(__SVR4)) && !defined(sun) && !defined(__sun) && !defined(sony_news) && !defined(__sony_news)


#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mkdev.h>
#include <sys/stat.h>
#include <sys/sdi.h>
#include <sys/sdi_edt.h>
#include <sys/scsi.h>
#include <errno.h>

#include "include/wm_config.h"
#include "include/wm_struct.h"
#include "include/wm_cdtext.h"

#define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM


void *malloc();
char *strchr();

int	min_volume = 0;
int	max_volume = 255;

static int
create_cdrom_node(char *dev_name)
{
  char pass_through[100];
  int file_des;
  dev_t pass_thru_device;
  int err;
  int ccode;


  strncpy(pass_through, dev_name, sizeof(pass_through) - 2);
  pass_through[sizeof(pass_through) - 2] = '\0';
  strcat(pass_through, "p" );

  if (setreuid(-1,0) < 0)
    {
      perror("setregid/setreuid/access");
      return -1;
    }

  ccode = access(pass_through, F_OK);

  if (ccode < 0)
    {
      if ((file_des = open(dev_name, O_RDONLY)) < 0)
	{
	  perror("open cdrom devices failed");
	  return -1;
	}

      if (ioctl(file_des, B_GETDEV, &pass_thru_device) < 0)
	{
	  perror("Call to get pass-through device number failed");
	  return -1;
	}

      (void)close(file_des);

      if (mknod(pass_through, (S_IFCHR | S_IREAD | S_IWRITE),
		pass_thru_device) < 0)
	{
	  perror("Unable to make pass-through node");
	  return -1;
	}

      if (chown(pass_through, 0 , 0) < 0)
	{
	  perror("chown");
	  return -1;
	}

      if (chmod(pass_through, 0660 ) < 0)
	{
	  perror("chmod");
	  return -1;
	}
    }

  file_des = open( pass_through, O_RDWR);
  err = errno;

  if ( (setreuid(-1,getuid()) < 0) || (setregid(-1,getgid()) < 0) )
    {
      perror("setreuid/setregid");
      return -1;
    }
  errno = err;
  return file_des;
} /* create_cdrom_node() */

const char*
find_cdrom()
{
  /*
  ** the path of the device has to start w/ /dev
  ** otherwise we are vulnerable to race conditions
  ** Thomas Biege <thomas@suse.de>
  */
  const char* device = NULL;

  device = getenv("CDROM");
  if ( (device != NULL) &&
       !(strncmp("/dev/", device, 5) ||
	 strstr(_device, "/../") ))
    return device;

  if (access("/dev/cdrom/cdrom1", F_OK) == 0)
    {
      return "/dev/cdrom/cdrom1";
    }
  else if (access("/dev/cdrom/cdrom2", F_OK) == 0)
    {
      return "/dev/cdrom/cdrom2";
    }
  else
    {
      fprintf(stderr, "Could not find a CD device!\n");
      return NULL;
    }
} /* find_cdrom() */

/*
 * Initialize the drive.  A no-op for the generic driver.
 */
int
gen_init(struct wm_drive *d)
{
  return 0;
} /* gen_init() */

/*
 * Open the CD and figure out which kind of drive is attached.
 */
int
gen_open(struct wm_drive *d)
{
	if (d->fd >= 0) {		/* Device already open? */
		wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "gen_open(): [device is open (fd=%d)]\n", d->fd);
		return 0;
    }

  	d->fd = create_cdrom_node(d->cd_device); /* this will do open */
	if (d->fd < 0) {
		if (errno == EACCES)
		else if (errno != EINTR)
			return -6;

		/* No CD in drive. (Is this true also for svr4 ? XXX ) */
		return 1;
    }

	return 0;
} /* gen_open() */

/*
 * Send a SCSI command out the bus.
 */
int
gen_scsi( struct wm_drive *d, unsigned char *xcdb, int cdblen,
	 char *retbuf, int retbuflen, int getreply)
{
  int ccode;
  int file_des = d->fd;
  int i,j;
  unsigned char sense_buffer[ SENSE_SZ ];
  int errno_save;

  /* getreply == 1 is read, == 0 is write */

  struct sb sb;
  struct scs scs;

  sb.sb_type = ISCB_TYPE;

  sb.SCB.sc_comp_code = SDI_PROGRES;
  sb.SCB.sc_int = NULL;
  sb.SCB.sc_wd = 0;
  sb.SCB.sc_dev.sa_major = 0;
  sb.SCB.sc_dev.sa_minor = 0;
  sb.SCB.sc_dev.sa_lun = 0;
  sb.SCB.sc_dev.sa_exlun = 0;
  sb.SCB.sc_status = 0;
  sb.SCB.sc_link = (struct sb *) NULL;
  sb.SCB.sc_resid = 0;

  sb.SCB.sc_cmdpt = (void *)xcdb;
  sb.SCB.sc_cmdsz = cdblen;

  sb.SCB.sc_datapt = retbuf ;
  sb.SCB.sc_datasz = retbuflen ;

  if (getreply == 1)
    sb.SCB.sc_mode = SCB_READ;
  else
    sb.SCB.sc_mode = SCB_WRITE;

  sb.SCB.sc_time = 500;

  ccode =  ioctl(file_des, SDI_SEND,  &sb);

  if ( (sb.SCB.sc_comp_code != 0xd000000e ) ||
       ( sb.SCB.sc_status != 02) )
    return ccode;

  errno_save = errno;

  sb.SCB.sc_comp_code = SDI_PROGRES;
  sb.SCB.sc_int = NULL;
  sb.SCB.sc_wd = 0;
  sb.SCB.sc_dev.sa_major = 0;
  sb.SCB.sc_dev.sa_minor = 0;
  sb.SCB.sc_dev.sa_lun = 0;
  sb.SCB.sc_dev.sa_exlun = 0;
  sb.SCB.sc_status = 0;
  sb.SCB.sc_link = (struct sb *) NULL;
  sb.SCB.sc_resid = 0;

  scs.ss_op	=	SS_REQSEN;
  scs.ss_lun	=	0;
  scs.ss_addr1	=	0;
  scs.ss_addr	=	0;
  scs.ss_len	=	SENSE_SZ;
  scs.ss_cont	=	0;

  sb.SCB.sc_cmdpt = SCS_AD(&scs);
  sb.SCB.sc_cmdsz = SCS_SZ;
  sb.SCB.sc_datapt = sense_buffer;
  sb.SCB.sc_datasz = 18;
  sb.SCB.sc_mode = SCB_READ;
  sb.SCB.sc_time = 5000;

  if (ioctl(file_des, SDI_SEND,  &sb) < 0)
    {
      fprintf(stderr,"Cannot read sense.\n");
      exit(-1);
    }

  errno=errno_save;
  return -1;
} /* gen_scsi() */

int
gen_close( struct wm_drive *d )
{
  if(d->fd != -1) {
    wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "closing the device\n");
    close(d->fd);
    d->fd = -1;
  }
  return 0;
}

/*
 * Get the current status of the drive: the current play mode, the absolute
 * position from start of disc (in frames), and the current track and index
 * numbers if the CD is playing or paused.
 */
int
gen_get_drive_status(struct wm_drive *d, int oldmode,
		     int *mode, int *pos, int *track, int *index)
{
  return wm_scsi2_get_drive_status(d, oldmode, mode, pos, track, index);
} /* gen_get_drive_status() */

/*
 * Get the number of tracks on the CD.
 */
int
gen_get_trackcount(struct wm_drive *d, int *tracks)
{
  return wm_scsi2_get_trackcount(d, tracks);
} /* gen_get_trackcount() */

/*
 * Get the start time and mode (data or audio) of a track.
 */
int
gen_get_trackinfo(struct wm_drive *d, int track, int *data, int *startframe)
{
  return wm_scsi2_get_trackinfo(d, track, data, startframe);
} /* gen_get_trackinfo() */

/*
 * Get the number of frames on the CD.
 */
int
gen_get_cdlen(struct wm_drive *d, int *frames)
{
  int tmp;

  return wm_scsi2_get_cdlen(d, frames);
} /* gen_get_cdlen() */

/*
 * Play the CD from one position to another (both in frames.)
 */
int
gen_play(struct wm_drive *d, int start, int end)
{
  return wm_scsi2_play(d, start, end);
} /* gen_play() */

/*
 * Pause the CD.
 */
int
gen_pause(struct wm_drive *d)
{
  return wm_scsi2_pause(d);
} /* gen_pause() */

/*
 * Resume playing the CD (assuming it was paused.)
 */
int
gen_resume(struct wm_drive *d)
{
  return wm_scsi2_resume(d);
} /* gen_resume() */

/*
 * Stop the CD.
 */
int
gen_stop(struct wm_drive *d)
{
  return wm_scsi2_stop(d);
} /* gen_stop() */


/*
 * Eject the current CD, if there is one.
 */
int
gen_eject(struct wm_drive *d)
{
  return wm_scsi2_eject(d);
} /* gen_eject() */

/*
 * Close the tray.
 * please review scsi.c / wm_scsi2_closetray()
 * and send changes to milliByte@DeathsDoor.com
 */
int
gen_closetray( struct wm_drive *d )
{
  return wm_scsi2_closetray(d);
} /* gen_closetray() */


/*
 * Set the volume level for the left and right channels.  Their values
 * range from 0 to 100.
 */
int
gen_set_volume(struct wm_drive *d, int left, int right)
{
  return wm_scsi2_set_volume(d, left, right);
} /* gen_set_volume() */

/*
 * Read the initial volume from the drive, if available.  Each channel
 * ranges from 0 to 100, with -1 indicating data not available.
 */
int
gen_get_volume(struct wm_drive *d, int *left, int *right)
{
  return wm_scsi2_get_volume(d, left, right);
} /* gen_get_volume() */

#endif