File indexing completed on 2024-04-21 04:54:23

 /*
  * 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
  *
  *
  * Linux-specific drive control routines.  Very similar to the Sun module.
  */
 
 #if defined(__linux__)
 
 #include "include/wm_config.h"
 #include "include/wm_struct.h"
 #include "include/wm_cdtext.h"
 #include "include/wm_cdda.h"
 #include "include/wm_platform.h"
 #include "include/wm_cdrom.h"
 #include "include/wm_scsi.h"
 #include "include/wm_helpers.h"
 
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 /* Try to get around bug #29274 */
 #include <linux/version.h>
 #if 0
 /* this breaks the build on ia64 and s390 for example.
    sys/types.h is already included and should provide __u64.
    please tell where we really need this and let's try to find
    a working #if case for everyone ... adrian@suse.de */
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,50)) || (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21) && LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 #undef __GNUC__
 typedef unsigned long long __u64;
 #endif
 #endif
 
 #if defined(BSD_MOUNTTEST)
   #include <mntent.h>
 #else
   /*
    * this is for glibc 2.x which defines ust structure in
    * ustat.h not stat.h
    */
   #ifdef __GLIBC__
     #include <sys/ustat.h>
   #endif
 #endif
 
 
 #include <sys/time.h>
 #include <sys/ioctl.h>
 
 #ifndef __GNUC__
 #define __GNUC__ 1
 #endif
 /* needed for vanilla kernel headers, which do provide __u64 only
    for ansi */
 #undef __STRICT_ANSI__
 /* needed for non-ansi kernel headers */
 #define asm __asm__
 #define inline __inline__
 #include <asm/types.h>
 #include <linux/cdrom.h>
 #undef asm
 #undef inline
 
 #ifdef OSS_SUPPORT
 #include <linux/soundcard.h>
 #define CD_CHANNEL SOUND_MIXER_CD
 #endif
 
 #define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
 
 #ifdef LINUX_SCSI_PASSTHROUGH
 /* this is from <scsi/scsi_ioctl.h> */
 # define SCSI_IOCTL_SEND_COMMAND 1
 #endif
 
 /*-------------------------------------------------------*
  *
  *
  *                   CD-ROM drive functions.
  *
  *
  *-------------------------------------------------------*/
 int gen_init(struct wm_drive *d)
 {
     return 0;
 }
 
 int gen_open(struct wm_drive *d)
 {
     if(d->fd > -1) {
         wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "plat_open(): [device is open (fd=%d)]\n",
             d->fd);
         return 0;
     }
 
     d->fd = open(d->cd_device, O_RDONLY | O_NONBLOCK);
     wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "plat_open(): device=%s fd=%d\n",
         d->cd_device, d->fd);
 
     if(d->fd < 0)
         return -errno;
 
     return 0;
 }
 
 int gen_close(struct wm_drive *d)
 {
     wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "linux_close(): 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 *ind)
 {
     struct cdrom_subchnl sc;
     int ret;
 
 #ifdef SBPCD_HACK
     static int prevpos = 0;
 #endif
 
     /* Is the device open? */
     if (d->fd > -1) {
         ret = d->proto.open(d);
         if(ret < 0) /* error */
             return ret;
 
         if(ret == 1) {
             /* retry */
             *mode = WM_CDM_UNKNOWN;
             return 0;
         }
     }
 
     /* Try to get rid of the door locking    */
     /* Don't care about return value. If it  */
     /* works - fine. If not - ...            */
     ioctl(d->fd, CDROM_LOCKDOOR, 0);
 
     *mode = WM_CDM_UNKNOWN;
 
     sc.cdsc_format = CDROM_MSF;
 
     if(!ioctl(d->fd, CDROMSUBCHNL, &sc)) {
         switch (sc.cdsc_audiostatus) {
         case CDROM_AUDIO_PLAY:
             *mode = WM_CDM_PLAYING;
             *track = sc.cdsc_trk;
             *ind = sc.cdsc_ind;
             *pos = sc.cdsc_absaddr.msf.minute * 60 * 75 +
             sc.cdsc_absaddr.msf.second * 75 +
             sc.cdsc_absaddr.msf.frame;
 #ifdef SBPCD_HACK
             if( *pos < prevpos ) {
                 if( (prevpos - *pos) < 75 ) {
                     *mode = WM_CDM_TRACK_DONE;
                 }
             }
 
             prevpos = *pos;
 #endif
             break;
 
         case CDROM_AUDIO_PAUSED:
             if (oldmode == WM_CDM_PLAYING || oldmode == WM_CDM_PAUSED) {
                 *mode = WM_CDM_PAUSED;
                 *track = sc.cdsc_trk;
                 *ind = sc.cdsc_ind;
                 *pos = sc.cdsc_absaddr.msf.minute * 60 * 75 +
                 sc.cdsc_absaddr.msf.second * 75 +
                 sc.cdsc_absaddr.msf.frame;
             } else
                 *mode = WM_CDM_STOPPED;
             break;
 
         case CDROM_AUDIO_NO_STATUS:
             *mode = WM_CDM_STOPPED;
             break;
 
         case CDROM_AUDIO_COMPLETED:
             *mode = WM_CDM_TRACK_DONE; /* waiting for next track. */
             break;
 
         case CDROM_AUDIO_INVALID: /**/
         default:
             *mode = WM_CDM_UNKNOWN;
             break;
         }
     }
 
     if(WM_CDS_NO_DISC(*mode)) {
         /* verify status of drive */
         ret = ioctl(d->fd, CDROM_DRIVE_STATUS, 0/* slot */);
         if(ret == CDS_DISC_OK)
             ret = ioctl(d->fd, CDROM_DISC_STATUS, 0);
 
         switch(ret) {
         case CDS_NO_DISC:
             *mode = WM_CDM_NO_DISC;
             break;
         case CDS_TRAY_OPEN:
             *mode = WM_CDM_EJECTED;
             break;
         case CDS_AUDIO:
         case CDS_MIXED:
             *mode = WM_CDM_STOPPED;
             break;
         case CDS_DRIVE_NOT_READY:
         case CDS_NO_INFO:
         case CDS_DATA_1:
         case CDS_DATA_2:
         case CDS_XA_2_1:
         case CDS_XA_2_2:
         default:
             *mode = WM_CDM_UNKNOWN;
         }
     }
 
     return 0;
 }
 
 /*-------------------------------------*
  * Get the number of tracks on the CD.
  *-------------------------------------*/
 int gen_get_trackcount(struct wm_drive *d, int *tracks)
 {
     struct cdrom_tochdr hdr;
 
     if(ioctl(d->fd, CDROMREADTOCHDR, &hdr))
         return -1;
 
     *tracks = hdr.cdth_trk1;
     return 0;
 }
 
 /*---------------------------------------------------------*
  * 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)
 {
     struct cdrom_tocentry entry;
 
     entry.cdte_track = track;
     entry.cdte_format = CDROM_MSF;
 
     if(ioctl(d->fd, CDROMREADTOCENTRY, &entry))
         return -1;
 
     *startframe = entry.cdte_addr.msf.minute * 60 * 75 +
         entry.cdte_addr.msf.second * 75 +
         entry.cdte_addr.msf.frame;
     *data = entry.cdte_ctrl & CDROM_DATA_TRACK ? 1 : 0;
 
     return 0;
 }
 
 /*-------------------------------------*
  * Get the number of frames on the CD.
  *-------------------------------------*/
 int gen_get_cdlen(struct wm_drive *d, int *frames)
 {
     int tmp;
 
     return d->proto.get_trackinfo(d, CDROM_LEADOUT, &tmp, frames);
 }
 
 /*------------------------------------------------------------*
  * Play the CD from one position to another (both in frames.)
  *------------------------------------------------------------*/
 int gen_play(struct wm_drive *d, int start, int end)
 {
     struct cdrom_msf msf;
 
     msf.cdmsf_min0 = start / (60*75);
     msf.cdmsf_sec0 = (start % (60*75)) / 75;
     msf.cdmsf_frame0 = start % 75;
     msf.cdmsf_min1 = end / (60*75);
     msf.cdmsf_sec1 = (end % (60*75)) / 75;
     msf.cdmsf_frame1 = end % 75;
 
     if(ioctl(d->fd, CDROMPLAYMSF, &msf)) {
         if(ioctl(d->fd, CDROMSTART))
             return -1;
         if(ioctl(d->fd, CDROMPLAYMSF, &msf))
             return -2;
     }
 
     return 0;
 }
 
 /*---------------*
  * Pause the CD.
  *---------------*/
 int gen_pause(struct wm_drive *d)
 {
     return ioctl(d->fd, CDROMPAUSE);
 }
 
 /*-------------------------------------------------*
  * Resume playing the CD (assuming it was paused.)
  *-------------------------------------------------*/
 int gen_resume(struct wm_drive *d)
 {
     return ioctl(d->fd, CDROMRESUME);
 }
 
 /*--------------*
  * Stop the CD.
  *--------------*/
 int gen_stop(struct wm_drive *d)
 {
     return ioctl(d->fd, CDROMSTOP);
 }
 
 /*----------------------------------------*
  * Eject the current CD, if there is one.
  *----------------------------------------*/
 int gen_eject(struct wm_drive *d)
 {
     struct stat stbuf;
 #if !defined(BSD_MOUNTTEST)
     struct ustat ust;
 #else
     struct mntent *mnt;
     FILE *fp;
 #endif
 
     wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "ejecting?\n");
 
     if(fstat(d->fd, &stbuf) != 0) {
         wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS, "that weird fstat() thingy\n");
         return -2;
     }
 
   /* Is this a mounted filesystem? */
 #if !defined(BSD_MOUNTTEST)
     if (ustat(stbuf.st_rdev, &ust) == 0)
         return -3;
 #else
     /*
     * This is the same test as in the WorkBone interface.
     * I should eliminate it there, because there is no need
     * for it in the UI
     */
     /* check if drive is mounted (from Mark Buckaway's cdplayer code) */
     /* Changed it again (look at XPLAYCD from ????                    */
     /* It's better to check the device name rather than one device is */
     /* mounted as iso9660. That prevents "no playing" if you have more*/
     /* than one CD-ROM, and one of them is mounted, but it's not the  */
     /* audio CD                                              -dirk    */
     if((fp = setmntent (MOUNTED, "r")) == NULL) {
         wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS, "Could not open %s: %s\n",
             MOUNTED, strerror (errno));
         return -3;
     }
 
     while((mnt = getmntent (fp)) != NULL) {
         if(strcmp (mnt->mnt_fsname, d->cd_device) == 0) {
             wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS,
                 "CDROM already mounted (according to mtab). Operation aborted.\n");
             endmntent (fp);
             return -3;
         }
     }
     endmntent (fp);
 #endif /* BSD_MOUNTTEST */
 
     ioctl(d->fd, CDROM_LOCKDOOR, 0);
 
     if(ioctl(d->fd, CDROMEJECT)) {
         wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS, "eject failed (%s).\n", strerror(errno));
         return -1;
     }
 
     /*------------------
     * Things in "foobar_one" are left over from 1.4b3
     * I put them here for further observation. In 1.4b3, however,
     * that workaround didn't help at least for /dev/sbpcd
     * (The tray closed just after ejecting because re-opening the
     * device causes the tray to close)
     *------------------*/
 #ifdef foobar_one
     extern int intermittent_dev
     /*
     * Some drives (drivers?) won't recognize a new CD if we leave the
     * device open.
     */
     if(intermittent_dev)
         d->proto.close(d);
 #endif
 
     return 0;
 }
 
 int gen_closetray(struct wm_drive *d)
 {
 #ifdef CDROMCLOSETRAY
     wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS, "CDROMCLOSETRAY closing tray...\n");
     return ioctl(d->fd, CDROMCLOSETRAY);
 #else
     return -1;
 #endif /* CDROMCLOSETRAY */
 }
 
 static int min_volume = 0, max_volume = 255;
 /*------------------------------------------------------------------------*
  * scale_volume(vol, max)
  *
  * Return a volume value suitable for passing to the CD-ROM drive.  "vol"
  * is a volume slider setting; "max" is the slider's maximum value.
  * This is not used if sound card support is enabled.
  *
  *------------------------------------------------------------------------*/
 static int scale_volume(int vol, int max)
 {
 #ifdef CURVED_VOLUME
     return ((max * max - (max - vol) * (max - vol)) *
     track_info_status(max_volume - min_volume) / (max * max) + min_volume);
 #else
     return ((vol * (max_volume - min_volume)) / max + min_volume);
 #endif
 }
 
 static int unscale_volume(int vol, int max)
 {
 #ifdef CURVED_VOLUME
     /* FIXME do it simpler */
     int tmp = (((max_volume - min_volume - vol) * max * max) - (vol + min_volume));
     return max - sqrt((tmp/(max_volume - min_volume)));
 #else
     return (((vol - min_volume) * max) / (max_volume - min_volume));
 #endif
 }
 
 /*---------------------------------------------------------------------*
  * 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)
 {
     struct cdrom_volctrl v;
 
     v.channel0 = v.channel2 = left < 0 ? 0 : left > 255 ? 255 : left;
     v.channel1 = v.channel3 = right < 0 ? 0 : right > 255 ? 255 : right;
 
     return (ioctl(d->fd, CDROMVOLCTRL, &v));
 }
 
 /*---------------------------------------------------------------------*
  * Read the 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)
 {
     struct cdrom_volctrl v;
 
 #if defined(CDROMVOLREAD)
     if(!ioctl(d->fd, CDROMVOLREAD, &v)) {
         *left = (v.channel0 + v.channel2)/2;
         *right = (v.channel1 + v.channel3)/2;
     } else
 #endif
         /* Suns, HPs, Linux, NEWS can't read the volume; oh well */
         *left = *right = -1;
 
     return 0;
 }
 
 int gen_scale_volume(int *left, int *right)
 {
     /* Adjust the volume to make up for the CD-ROM drive's weirdness. */
     *left = scale_volume(*left, 100);
     *right = scale_volume(*right, 100);
 
     return 0;
 }
 
 int gen_unscale_volume(int *left, int *right)
 {
     *left = unscale_volume(*left, 100);
     *right = unscale_volume(*right, 100);
 
     return 0;
 }
 
 /*---------------------------------------------*
  * Send an arbitrary SCSI command to a device.
  *---------------------------------------------*/
 int gen_scsi(struct wm_drive *d, unsigned char *cdb, int cdblen,
     void *retbuf, int retbuflen, int getreply)
 {
     int ret;
 #ifdef LINUX_SCSI_PASSTHROUGH
 
     char *cmd;
     int cmdsize;
 
     cmdsize = 2 * sizeof(int);
     if(retbuf) {
         if (getreply)
             cmdsize += max(cdblen, retbuflen);
         else
             cmdsize += (cdblen + retbuflen);
     } else {
         cmdsize += cdblen;
     }
 
     cmd = malloc(cmdsize);
     if(cmd == NULL) {
         return -ENOMEM;
     }
     ((int*)cmd)[0] = cdblen + ((retbuf && !getreply) ? retbuflen : 0);
     ((int*)cmd)[1] = ((retbuf && getreply) ? retbuflen : 0);
 
     memcpy(cmd + 2*sizeof(int), cdb, cdblen);
     if(retbuf && !getreply)
         memcpy(cmd + 2*sizeof(int) + cdblen, retbuf, retbuflen);
 
     if(ioctl(d->fd, SCSI_IOCTL_SEND_COMMAND, cmd)) {
         wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "%s: ioctl(SCSI_IOCTL_SEND_COMMAND) failure\n", __FILE__);
         wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "command buffer is:\n");
         wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "%02x %02x %02x %02x %02x %02x\n",
         cmd[0],  cmd[1],  cmd[2],  cmd[3],  cmd[4],  cmd[5]);
         free(cmd);
         return -1;
     }
 
     if(retbuf && getreply)
         memcpy(retbuf, cmd + 2*sizeof(int), retbuflen);
 
     free(cmd);
     return 0;
 
 #else /* Linux SCSI passthrough*/
 /*----------------------------------------*
  * send packet over cdrom interface
  * kernel >= 2.2.16
  *----------------------------------------*/
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,2,15))
 
     struct cdrom_generic_command cdc;
     struct request_sense sense;
     int capability;
 
     wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "wm_scsi over CDROM_SEND_PACKET entered\n");
 
     capability = ioctl(d->fd, CDROM_GET_CAPABILITY);
 
     if(!(capability & CDC_GENERIC_PACKET)) {
         wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS,
             "your CDROM or/and kernel does not support CDC_GENERIC_PACKET ...\n");
         return -1;
     }
 
     memset(&cdc, 0, sizeof(struct cdrom_generic_command));
     memset(&sense, 0, sizeof(struct request_sense));
 
     memcpy(cdc.cmd, cdb, cdblen);
 
     cdc.buffer = retbuf;
     cdc.buflen = retbuflen;
     cdc.stat = 0;
     cdc.sense = &sense;
     cdc.data_direction = getreply?CGC_DATA_READ:CGC_DATA_WRITE;
 
     /* sendpacket_over_cdrom_interface() */
     if((ret = ioctl(d->fd, CDROM_SEND_PACKET, &cdc)))
         wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS,
             "ERROR: CDROM_SEND_PACKET %s\n", strerror(errno));
     return ret;
 #endif /* CDROM_SEND_PACKET */
     wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS,
         "ERROR: this binary was compiled without CDROM GENERIC PACKET SUPPORT. kernel version < 2.2.16?\n");
     wm_lib_message(WM_MSG_LEVEL_ERROR|WM_MSG_CLASS,
         "ERROR: if you have a SCSI CDROM, rebuild it with a #define LINUX_SCSI_PASSTHROUGH\n");
     return -1;
 #endif
 }
 
 #if 0
 #define CDROM_LBA         0x01   /* "logical block": first frame is #0 */
 #define CDROMREADAUDIO    0x530e /* (struct cdrom_read_audio) */
 #define CD_MSF_OFFSET     150    /* MSF numbering offset of first frame */
 
 /* This struct is used by the CDROMREADAUDIO ioctl */
 struct cdrom_read_audio
 {
     union {
         struct {
             unsigned char minute;
             unsigned char second;
             unsigned char frame;
         } msf;
         signed int          lba;
     } addr; /* frame address */
     unsigned char addr_format;      /* CDROM_LBA or CDROM_MSF */
     signed int nframes;           /* number of 2352-byte-frames to read at once */
     unsigned char *buf;      /* frame buffer (size: nframes*2352 bytes) */
 };
 
 #define CDDABLKSIZE 2352
 
 #endif
 
 int gen_cdda_init(struct wm_drive *d)
 {
     return 0;
 }
 
 /*
  * Initialize the CDDA data buffer and open the appropriate device.
  *
  */
 int gen_cdda_open(struct wm_drive *d)
 {
     int i;
     struct cdrom_read_audio cdda;
 
     if (d->fd > -1)
         return -1;
 
     for (i = 0; i < d->numblocks; i++) {
         d->blocks[i].buflen = d->frames_at_once * CD_FRAMESIZE_RAW;
         d->blocks[i].buf = malloc(d->blocks[i].buflen);
         if (!d->blocks[i].buf) {
             ERRORLOG("plat_cdda_open: ENOMEM\n");
             return -ENOMEM;
         }
     }
 
     cdda.addr_format = CDROM_LBA;
     cdda.addr.lba = 200;
     cdda.nframes = 1;
     cdda.buf = (unsigned char *)d->blocks[0].buf;
 
     d->status = WM_CDM_STOPPED;
     if((ioctl(d->fd, CDROMREADAUDIO, &cdda) < 0)) {
         if (errno == ENXIO) {
             /* CD ejected! */
             d->status = WM_CDM_EJECTED;
         } else {
             /* Sometimes it fails once, dunno why */
             d->status = WM_CDM_CDDAERROR;
         }
     } else {
         d->status = WM_CDM_UNKNOWN;
     }
 
 
     return 0;
 }
 
 /*
  * Read some blocks from the CD.  Stop if we hit the end of the current region.
  *
  * Returns number of bytes read, -1 on error, 0 if stopped for a benign reason.
  */
 int gen_cdda_read(struct wm_drive *d, struct wm_cdda_block *block)
 {
     struct cdrom_read_audio cdda;
 
     if (d->fd < 0)
         return -1;
 
     /* Hit the end of the CD, probably. */
     if (d->current_position >= d->ending_position) {
         block->status = WM_CDM_TRACK_DONE;
         return 0;
     }
 
     cdda.addr_format = CDROM_LBA;
     cdda.addr.lba = d->current_position - CD_MSF_OFFSET;
     if (d->ending_position && d->current_position + d->frames_at_once > d->ending_position)
         cdda.nframes = d->ending_position - d->current_position;
     else
         cdda.nframes = d->frames_at_once;
 
     cdda.buf = (unsigned char*)block->buf;
 
     if (ioctl(d->fd, CDROMREADAUDIO, &cdda) < 0) {
         if (errno == ENXIO) {
             /* CD ejected! */
             block->status = WM_CDM_EJECTED;
             return 0;
         } else {
             /* Sometimes it fails once, dunno why */
             block->status = WM_CDM_CDDAERROR;
             return 0;
         }
     }
 
     block->track =  -1;
     block->index =  0;
     block->frame  = d->current_position;
     block->status = WM_CDM_PLAYING;
     block->buflen = cdda.nframes * CD_FRAMESIZE_RAW;
 
     d->current_position = d->current_position + cdda.nframes;
 
     return block->buflen;
 }
 
 /*
  * Close the CD-ROM device in preparation for exiting.
  */
 int gen_cdda_close(struct wm_drive *d)
 {
     int i;
 
     if (d->fd < 0)
         return -1;
 
     for (i = 0; i < d->numblocks; i++) {
         free(d->blocks[i].buf);
         d->blocks[i].buf = 0;
         d->blocks[i].buflen = 0;
     }
 
     return 0;
 }
 
 #endif /* __linux__ */