claunia/libcdio-osx
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Patch from Burkhard Plaum:

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1. In the function is_cdrom_linux(...) in the file lib/driver/gnu_linux.c,
   the CDROMREADTOCHDR ioctl gets called, which fails when the drive is
   empty. The CDROM_GET_CAPABILITY ioctl always succeeds for CDrom drives
   and fails for hard disks etc.

2. For some reason, at least my (GNU/Linux 2.6.10) Kernel fails to
   open empty drives, when only O_RDONLY is used. Changing the open flag to
   O_RDONLY|O_NONBLOCK, the call succeeds also for emtpy drives.
   By the way, the cdrom header file in the kernel says explicitely,
   that O_RDONLY|O_NONBLOCK should used whenever a cdrom is touched.

rocky: also made a change to eject to continue even if we can't get
the drive status -- which we can't with an empty CD-ROM drive.
This commit is contained in:
rocky
2005-04-23 01:16:19 +00:00
parent 15ddfdbc2c
commit 320c9bd55f
5 changed files with 19 additions and 20 deletions
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15
lib/driver/gnu_linux.c
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@@ -1,5 +1,5 @@
/*
$Id: gnu_linux.c,v 1.12 2005/03/29 12:00:23 rocky Exp $
$Id: gnu_linux.c,v 1.13 2005/04/23 01:16:19 rocky Exp $
Copyright (C) 2001 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2002, 2003, 2004, 2005 Rocky Bernstein <rocky@panix.com>
@@ -27,7 +27,7 @@
# include "config.h"
#endif
static const char _rcsid[] = "$Id: gnu_linux.c,v 1.12 2005/03/29 12:00:23 rocky Exp $";
static const char _rcsid[] = "$Id: gnu_linux.c,v 1.13 2005/04/23 01:16:19 rocky Exp $";
#include <string.h>
@@ -610,6 +610,9 @@ eject_media_linux (void *p_user_data) {
ret = DRIVER_OP_ERROR;
}
break;
default:
cdio_info ("Unknown state of CD-ROM (%d)\n", status);
/* Fall through */
case CDS_DISC_OK:
if((ret = ioctl(p_env->gen.fd, CDROMEJECT)) != 0) {
int eject_error = errno;
@@ -624,9 +627,6 @@ eject_media_linux (void *p_user_data) {
/* force kernel to reread partition table when new disc inserted */
ret = ioctl(p_env->gen.fd, BLKRRPART);
break;
default:
cdio_warn ("Unknown CD-ROM (%d)\n", status);
ret = DRIVER_OP_ERROR;
}
} else {
cdio_warn ("CDROM_DRIVE_STATUS failed: %s\n", strerror(errno));
@@ -724,7 +724,6 @@ is_cdrom_linux(const char *drive, char *mnttype)
{
bool is_cd=false;
int cdfd;
struct cdrom_tochdr tochdr;
/* If it doesn't exist, return -1 */
if ( !cdio_is_device_quiet_generic(drive) ) {
@@ -734,7 +733,7 @@ is_cdrom_linux(const char *drive, char *mnttype)
/* If it does exist, verify that it's an available CD-ROM */
cdfd = open(drive, (O_RDONLY|O_NONBLOCK), 0);
if ( cdfd >= 0 ) {
if ( ioctl(cdfd, CDROMREADTOCHDR, &tochdr) != -1 ) {
if ( ioctl(cdfd, CDROM_GET_CAPABILITY, 0) != -1 ) {
is_cd = true;
}
close(cdfd);
@@ -1499,7 +1498,7 @@ cdio_open_am_linux (const char *psz_orig_source, const char *access_mode)
ret->driver_id = DRIVER_LINUX;
if (cdio_generic_init(_data)) {
if (cdio_generic_init(_data, O_RDONLY|O_NONBLOCK)) {
return ret;
} else {
cdio_generic_free (_data);