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Yet another guess at what happened to the CDROMREADTOCENTRY ioctl

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call.  I haven't been able to find anything that documents in any
detail how to use this ioctl let alone the weird behavior where
CDROMREADTOC header beforehand turns and "invalid parameter" into a
valid one. It's not the way other 'nix's work.
This commit is contained in:
rocky
2006-08-02 11:00:31 +00:00
parent ac887b6570
commit bb7a5244e5
1 changed files with 19 additions and 4 deletions
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23
lib/driver/gnu_linux.c
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@@ -1,8 +1,9 @@
/* /*
$Id: gnu_linux.c,v 1.23 2006/07/30 13:19:49 rocky Exp $ $Id: gnu_linux.c,v 1.24 2006/08/02 11:00:31 rocky Exp $
Copyright (C) 2001 Herbert Valerio Riedel <hvr@gnu.org> Copyright (C) 2001 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2002, 2003, 2004, 2005 Rocky Bernstein <rocky@panix.com> Copyright (C) 2002, 2003, 2004, 2005, 2006 Rocky Bernstein
<rockyb@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify 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 it under the terms of the GNU General Public License as published by
@@ -27,7 +28,7 @@
# include "config.h" # include "config.h"
#endif #endif
static const char _rcsid[] = "$Id: gnu_linux.c,v 1.23 2006/07/30 13:19:49 rocky Exp $"; static const char _rcsid[] = "$Id: gnu_linux.c,v 1.24 2006/08/02 11:00:31 rocky Exp $";
#include <string.h> #include <string.h>
@@ -1155,6 +1156,18 @@ run_mmc_cmd_linux( void *p_user_data,
/*! /*!
Return the size of the CD in logical block address (LBA) units. Return the size of the CD in logical block address (LBA) units.
@return the lsn. On error return CDIO_INVALID_LSN. @return the lsn. On error return CDIO_INVALID_LSN.
As of GNU/Linux 2.6, CDROMTOCENTRY gives
ioctl CDROMREADTOCENTRY failed: Invalid argument
In some cases CDROMREADTOCHDR seems to fix this, but I haven't been
able to find anything that documents this requirement or behavior. It's
not the way CDROMREADTOCHDR works on other 'nixs.
Also note that in one at least one test the corresponding MMC gives
a different answer, so there may be some disagreement about what is in
fact the last lsn.
*/ */
static lsn_t static lsn_t
get_disc_last_lsn_linux (void *p_user_data) get_disc_last_lsn_linux (void *p_user_data)
@@ -1164,8 +1177,10 @@ get_disc_last_lsn_linux (void *p_user_data)
struct cdrom_tocentry tocent; struct cdrom_tocentry tocent;
uint32_t i_size; uint32_t i_size;
if (!p_env->gen.toc_init) read_toc_linux (p_user_data) ;
tocent.cdte_track = CDIO_CDROM_LEADOUT_TRACK; tocent.cdte_track = CDIO_CDROM_LEADOUT_TRACK;
tocent.cdte_format = CDROM_MSF; tocent.cdte_format = CDROM_LBA;
if (ioctl (p_env->gen.fd, CDROMREADTOCENTRY, &tocent) == -1) if (ioctl (p_env->gen.fd, CDROMREADTOCENTRY, &tocent) == -1)
{ {
cdio_warn ("ioctl CDROMREADTOCENTRY failed: %s\n", strerror(errno)); cdio_warn ("ioctl CDROMREADTOCENTRY failed: %s\n", strerror(errno));