growisofs.c

最新的linux下dvd刻录软件,支持DVD+RW、DVD-RW光盘刻录。

/*
 * growisofs 7.0 by Andy Polyakov <[e-mail]>.
 *
 * Version 6.0 is dedicated to all personal friends of mine! The code
 * was initially intended to be a 2006 New Year gift to them, but it
 * didn't happen:-( But it doesn't change the fact that I think of
 * you, guys! Cheers!
 *
 * Use-it-on-your-own-risk, GPL bless...
 *
 * This front-end to mkisofs(8) was originally developed to facilitate
 * appending of data to ISO9660 volumes residing on random write access
 * DVD media such as DVD+RW, DVD-RAM, as well as plain files/iso images.
 * At later stages even support for multi-session recording to DVD
 * write-once media such as DVD+R and DVD-R was added.
 *
 * As for growing random access volumes. The idea is very simple. The
 * program appends new data as it was added to a multisession media and
 * then copies the new volume descriptor(s) to the beginning of media
 * thus effectively updating the root catalog reference...
 *
 * For further details see http://fy.chalmers.se/~appro/linux/DVD+RW/.
 *
 * Revision history:
 *
 * 1.1:
 * - flush cache before copying volume descriptors;
 * 2.0:
 * - support for /dev/raw*;
 * - support for set-root-uid operation (needed for /dev/raw*);
 * - support for first "session" burning (needed for "poor-man");
 * - "poor-man" support for those who don't want to recompile the
 *   kernel;
 * 2.1:
 * - mkisofs_pid typo;
 * 2.2:
 * - uninitialized in_device variable;
 * - -help option;
 * 3.0:
 * - support for DVD+R;
 * 3.1:
 * - -Z fails if a file system is present and stdin is not a tty;
 * 3.2:
 * - support for image burning (needed for DVD+R as you can't use dd);
 * 3.3:
 * - 'growisofs -Z /dev/scdN image.iso' is too confusing, implement
 *   'growisofs -Z /dev/scdN=image.iso' instead;
 * 4.0:
 * - transport C++-fication for better portability;
 * - support for -dvd-compat option (improved DVD+R/RW compatibility);
 * - -dvd-video implies -dvd-compat;
 * - support for SONY DRU-500A;
 * - progress indicator for -Z /dev/scdN=image.iso;
 * - agressive -poor-man-ing;
 * 4.1:
 * - uninitialized errno at exit from -Z /dev/scdN=image.iso;
 * 4.2:
 * - don't print initial bogus progress indicator values;
 * - apparently some firmwares exhibit ambiguity in DVD+R disc
 *   finalizing code;
 * 5.0:
 * - enforced 32K write strategy (needed for DVD-R[W]);
 * - support for DVD-RW Restricted Overwrite Mode;
 * - support for DVD-R[W] Sequential Mode;
 * 5.1:
 * - support for writing speed control;
 * 5.2:
 * - re-make it work under Linux 2.2 kernel;
 * - progress indicator to display recording velocity;
 * - code to protect against overburns;
 * - undocumented -use-the-force-luke flag to overwrite the media
 *   none interactively;
 * - brown-bag bug in "LONG WRITE IN PROGRESS" handling code fixed;
 * 5.3:
 * - Pioneer workarounds/fix-ups, most notably DVR-x05 doesn't seem
 *   to digest immediate "SYNC CACHE";
 * - support for DVD-RW Quick Format, upon release verified to work
 *   with Pioneer DVR-x05;
 * - bug in DVD+RW overburn "protection" code fixed;
 * - media reload is moved here from dvd+rw-format;
 * - refuse to burn if session starts close to or beyond 4GB limit
 *   (limitation of Linux isofs implementation);
 * - dry_run check is postponed all the way till the first write;
 * 5.4:
 * - split first write to two to avoid "empty DMA table?" in kernel log;
 * - setup_fds is introduced to assist ports to another platforms;
 * - set-root-uid assistant code directly at entry point (see main());
 * - OpenBSD/NetBSD support added, it's worth noting that unlike 3.3
 *   port by Maarten Hofman, it's /dev/rcd?c which is expected to be
 *   passed as argument, not /dev/cd?c.
 * 5.5:
 * - fix for ENOENT at unmount, I should have called myself with execlp,
 *   not execl;
 * - security: chdir("/") in set-root-uid assistant;
 * - use /proc/mounts instead of MOUNTED (a.k.a. /etc/mtab) in Linux
 *   umount code;
 * 5.6:
 * - unconditional exit in set-root-uid assistant, mostly for aesthetic
 *   reasons;
 * - support for DVD-RW DAO recordings (whenever Pioneer-ish Quick
 *   Format is not an option, DAO should fill in for it, as it's the
 *   only recording strategy applicable after *minimal* blanking
 *   procedure);
 * - support for SG_IO pass-through interface, or in other words
 *   support for Linux 2>=5;
 * - 'growisofs -M /dev/cdrom=/dev/zero', this is basically a counter-
 *   intuitive kludge assigned to fill up multi-session write-once
 *   media for better compatibility with DVD-ROM/-Video units, to keep
 *   it mountable [in the burner unit] volume descriptors from previous
 *   session are copied to the new session;
 * - disable -dvd-compat with -M option and DVD+R, advice to fill up
 *   the media as above instead;
 * - postpone Write Page setup all the way till after dry_run check;
 * - if recording to write-once media is terminated by external event,
 *   leave the session opened, so that the recording can be resumed
 *   (though no promises about final results are made, it's just that
 *   leaving it open makes more sense than to close the session);
 * - ask unit to perform OPC if READ DISC INFORMATION doesn't return
 *   any OPC descriptors;
 * - get rid of redundant Quick Grow in Restricted Overwrite;
 * - Solaris 2.x support is merged, it's volume manager aware, i.e.
 *   you can run it with or without volume manager;
 * 5.7:
 * - Solaris USB workaround;
 * - 15 min timeout for FLUSH CACHE in DVD-RW DAO;
 * - revalidate recording speed;
 * - load media upon start-up (Linux used to auto-close tray upon open,
 *   but not the others, which is why this functionality is added so
 *   late);
 * 5.8:
 * - elder Ricoh firmwares seem to report events differently, which
 *   triggered growisofs and dvd+rw-format to end-less loop at startup
 *   [event handling was introduced in 5.6 for debugging purposes];
 * - int ioctl_fd is transformed to void *ioctl_handle to facilitate
 *   port to FreeBSD;
 * - FreeBSD support contributed by Matthew Dillon;
 * - volume descriptors from second session were discarded in
 *   Restricted Overwrite since 5.6;
 * 5.9:
 * - some [SONY] firmwares make it impossible to tell apart minimally
 *   and fully blanked media, so we need a way to engage DAO manually
 *   [in DVD-RW]... let's treat multiple -dvd-compat options as "cry"
 *   for DAO;
 * - refuse to finalize even DVD-R media with -M flag (advise to fill
 *   it up with -M /dev/cdrom=/dev/zero too), apparently DVD-units
 *   [or is it just SONY?] also "misplace" legacy lead-out in the same
 *   manner as DVD+units;
 * - oops! DAO hung at >4MB buffer because of sign overflow;
 * - couple of human-readable error messages in poor_mans_pwrite64;
 * - work around Plextor firmware deficiency which [also] manifests as
 *   end-less loop upon startup;
 * 5.10:
 * - increase timeout for OPC, NEC multi-format derivatives might
 *   require more time to fulfill the OPC procedure;
 * - extended syntax for -use-the-force-luke option, it's now possible
 *   to engage DVD-R[W] dummy mode by -use-the-force-luke=[tty,]dummy
 *   for example, where "tty" substitutes for the original non-extended
 *   option meaning, see the source for more easter eggs;
 * - FreeBSD: compile-time option to pass -M /dev/fd/0 to mkisofs to
 *   make life easier for those who mount devfs, but not fdescfs;
 * - eliminate potential race conditions;
 * - avoid end-less loop if no media was in upon tray load;
 * - interpret value of MKISOFS environment variable as absolute path
 *   to mkisofs binary;
 * - to facilitate for GUI front-ends return different exit codes, most
 *   notably exit value of 128|errno denotes a fatal error upon program
 *   startup [messages worth popping up in a separate modal dialog
 *   perhaps?], errno - fatal error during recording and 1 - warnings
 *   at exit;
 * - to facilitate for GUI front-ends auto-format blank DVD+RW media;
 * - Linux: fix for failure to copy volume descriptors when DVD-RW
 *   Restricted Overwrite procedure is applied to patched kernel;
 * - FreeBSD: growisofs didn't close tray upon startup nor did the rest
 *   of the tools work with open tray;
 * - bark at -o option and terminate execution, the "problem" was that
 *   users seem to misspell -overburn once in a while, in which case it
 *   was passed down to mkisofs and an iso-image was dumped to current