Blank CDs do not have a TOC, thus will fail cd_media_toc() (at least with the
"Do not ignore errors from scsi_cmd_run()" fix). Thus probe the media state
first, so that we can properly detect blank media.
scsi_cmd_run() can return positive error messages if we have CHECK_CONDITION
set and get the error code from the SCSI command result. So check the result
for non-zero, not for being negative.
This should fix another cause for "phantom" media in empty CD-ROM drives.
Thanks to Mike Brudevold <mike@brudevold.com> for spotting this!
https://launchpad.net/bugs/562978
Commit 5c6954f is actually a no-op, since static variables are already zero'ed
by default anyway (but we keep it for clarity). The real difference was that a
build with -O0 wor while a build with -O2 didn't.
Turns out that some ioctls do not actually touch the result buffer in some
cases, so we need to zero the result buffers to avoid interpreting random da as
CD properties.
https://launchpad.net/bugs/559723https://launchpad.net/bugs/561585
In cases where cdrom_id does not go through the entire code path and one of the
probing functions returns -1 or exits early, the remaining variables were never
initialized. This caused effects like "phantom" audio CDs on empty drives, or
bogus data like ID_CDROM_MEDIA_TRACK_COUNT=22528.
Initialize the variables right away to avoid that.
Bug-Ubuntu: https://launchpad.net/bugs/559723
We can not predict the major/minor of non-existing devices:
$ grep . /sys/class/block/sd*/dev
/sys/class/block/sda1/dev:259:524288
/sys/class/block/sda2/dev:259:262144
/sys/class/block/sda3/dev:259:786432
/sys/class/block/sda4/dev:259:131072
/sys/class/block/sda/dev:259:0
/sys/class/block/sdb/dev:259:655360
/sys/class/block/sdc/dev:259:393216
If this functionality is still needed for some broken hardware, it needs to be
solved with a tool not part of the udev package. Because such option is unreliable
and unsafe to use.
We now make sure to run all services in their own session, possibly with
a controlling terminal.
This also extends the service and socket state machines a little.
Lennart Poettering
Mike Brudevold
Yury G. Kudryashov
Martin Pitt
Kay Sievers