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libburn/libburn/async.c

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/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
/* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
Copyright (c) 2006 - 2017 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
/* ts A71019 */
/* Standard measure should be: Threads are created detached.
According to the man pages they should then care for disposing themselves.
>>> ??? It is yet unclear why the threads vanish from the process list
even if joinable and even if never joined.
To be activated after release of libburn-0.4.0
*/
#define Libburn_create_detached_threadS 1
/* Alternative : Threads are created joinable.
Threads get detached in remove_worker() and thus should dispose themselves.
#define Libburn_detach_done_workeR 1
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include "libburn.h"
#include "transport.h"
#include "drive.h"
#include "write.h"
#include "options.h"
#include "file.h"
#include "async.h"
#include "init.h"
#include "back_hacks.h"
#include <pthread.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
/*
#include <a ssert.h>
*/
#include "libdax_msgs.h"
extern struct libdax_msgs *libdax_messenger;
/* ts A80714 : introduced type codes for the worker list */
#define Burnworker_type_scaN 0
#define Burnworker_type_erasE 1
#define Burnworker_type_formaT 2
#define Burnworker_type_writE 3
#define Burnworker_type_fifO 4
#define SCAN_GOING() (workers != NULL && \
workers->w_type == Burnworker_type_scaN)
typedef void *(*WorkerFunc) (void *);
struct scan_opts
{
struct burn_drive_info **drives;
unsigned int *n_drives;
int done;
};
struct erase_opts
{
struct burn_drive *drive;
int fast;
};
/* ts A61230 */
struct format_opts
{
struct burn_drive *drive;
off_t size;
int flag;
};
struct write_opts
{
struct burn_drive *drive;
struct burn_write_opts *opts;
struct burn_disc *disc;
};
struct fifo_opts
{
struct burn_source *source;
int flag;
};
union w_list_data
{
struct scan_opts scan;
struct erase_opts erase;
struct format_opts format;
struct write_opts write;
struct fifo_opts fifo;
};
struct w_list
{
/* ts A80714 */
int w_type; /* see above define Burnworker_type_* */
struct burn_drive *drive;
pthread_t thread;
struct w_list *next;
union w_list_data u;
};
static struct w_list *workers = NULL;
static void *fifo_worker_func(struct w_list *w);
int burn_async_manage_lock(int mode)
{
int ret;
static pthread_mutex_t access_lock;
static int mutex_initialized = 0;
static int mutex_locked = 0;
if (mode == BURN_ASYNC_LOCK_INIT) {
if (mutex_initialized)
return 2;
ret = pthread_mutex_init(&access_lock, NULL);
if (ret != 0)
return 0;
mutex_initialized = 1;
return 1;
}
if (!mutex_initialized)
return 0;
if (mode == BURN_ASYNC_LOCK_OBTAIN) {
ret = pthread_mutex_lock(&access_lock);
if (ret != 0)
return 0;
mutex_locked = 1;
} else if (mode == BURN_ASYNC_LOCK_RELEASE) {
if (!mutex_locked)
return 2;
ret = pthread_mutex_unlock(&access_lock);
if (ret != 0)
return 0;
mutex_locked = 0;
}
return 1;
}
static struct w_list *find_worker(struct burn_drive *d)
{
struct w_list *a;
for (a = workers; a; a = a->next)
if (a->drive == d)
return a;
return NULL;
}
static void add_worker(int w_type, struct burn_drive *d,
WorkerFunc f, union w_list_data *data)
{
struct w_list *a;
struct w_list *tmp;
pthread_attr_t *attr_pt = NULL;
#ifdef Libburn_create_detached_threadS
pthread_attr_t attr;
#endif
a = calloc(1, sizeof(struct w_list));
a->w_type = w_type;
a->drive = d;
a->u = *data;
burn_async_manage_lock(BURN_ASYNC_LOCK_INIT);
/* insert at front of the list */
a->next = workers;
tmp = workers;
workers = a;
if (d != NULL)
d->busy = BURN_DRIVE_SPAWNING;
#ifdef Libburn_create_detached_threadS
/* ts A71019 :
Trying to start the threads detached to get rid of the zombies
which do neither react on pthread_join() nor on pthread_detach().
*/
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
attr_pt= &attr;
#endif /* Libburn_create_detached_threadS */
/* Worker specific locks are to be released early by the worker */
if (f == (WorkerFunc) fifo_worker_func)
burn_async_manage_lock(BURN_ASYNC_LOCK_OBTAIN);
if (pthread_create(&a->thread, attr_pt, f, a)) {
free(a);
workers = tmp;
return;
}
}
static void remove_worker(pthread_t th)
{
struct w_list *a, *l = NULL;
for (a = workers; a; l = a, a = a->next)
if (a->thread == th) {
if (l)
l->next = a->next;
else
workers = a->next;
#ifdef Libburn_detach_done_workeR
/* ts A71019 : burry dead puppy before forgetting it */
/* Alternative : threads get detached and thus should
dispose themselves.
*/
pthread_detach(th);
/*
int ret;
char msg[80];
ret = pthread_detach(th);
sprintf(msg,
"remove_workers(): pid= %lu pthread_detach(%lu)= %d",
(unsigned long) getpid(), (unsigned long) th, ret);
libdax_msgs_submit(libdax_messenger, -1, 0x00020158,
LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_LOW,
msg, 0, 0);
*/
#endif /* Libburn_detach_done_workeR */
free(a);
break;
}
/* ts A61006 */
/* a ssert(a != NULL);/ * wasn't found.. this should not be possible */
if (a == NULL)
libdax_msgs_submit(libdax_messenger, -1, 0x00020101,
LIBDAX_MSGS_SEV_WARNING, LIBDAX_MSGS_PRIO_HIGH,
"remove_worker() cannot find given worker item", 0, 0);
}
static void *scan_worker_func(struct w_list *w)
{
int ret;
ret = burn_drive_scan_sync(w->u.scan.drives, w->u.scan.n_drives, 1);
if (ret <= 0)
w->u.scan.done = -1;
else
w->u.scan.done = 1;
return NULL;
}
static void reset_progress(struct burn_drive *d, int sessions, int tracks,
int indices, int sectors, int flag)
{
/* reset the progress indicator */
d->progress.session = 0;
d->progress.sessions = sessions;
d->progress.track = 0;
d->progress.tracks = tracks;
d->progress.index = 0;
d->progress.indices = indices;
d->progress.start_sector = 0;
d->progress.sectors = sectors;
d->progress.sector = 0;
}
int burn_drive_scan(struct burn_drive_info *drives[], unsigned int *n_drives)
{
union w_list_data o;
int ret = 0;
/* ts A61006 : moved up from burn_drive_scan_sync , former Assert */
if (!burn_running) {
libdax_msgs_submit(libdax_messenger, -1, 0x00020109,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Library not running (on attempt to scan)", 0, 0);
*drives = NULL;
*n_drives = 0;
return -1;
}
/* cannot be anything working! */
/* ts A61006 */
/* a ssert(!(workers && workers->drive)); */
if (workers != NULL && workers->drive != NULL) {
drive_is_active:;
libdax_msgs_submit(libdax_messenger, -1, 0x00020102,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"A drive operation is still going on (want to scan)",
0, 0);
*drives = NULL;
*n_drives = 0;
return -1;
}
if (workers == NULL) {
/* start it */
/* ts A61007 : test moved up from burn_drive_scan_sync()
was burn_wait_all() */
/* ts A70907 : now demanding freed drives, not only released */
if (!burn_drives_are_clear(1))
goto drive_is_active;
*drives = NULL;
*n_drives = 0;
o.scan.drives = drives;
o.scan.n_drives = n_drives;
o.scan.done = 0;
add_worker(Burnworker_type_scaN, NULL,
(WorkerFunc) scan_worker_func, &o);
} else if (workers->u.scan.done) {
/* its done */
ret = workers->u.scan.done;
remove_worker(workers->thread);
/* ts A61006 */
/* a ssert(workers == NULL); */
if (workers != NULL) {
libdax_msgs_submit(libdax_messenger, -1, 0x00020101,
LIBDAX_MSGS_SEV_WARNING, LIBDAX_MSGS_PRIO_HIGH,
"After scan a drive operation is still going on",
0, 0);
return -1;
}
} else {
/* still going */
}
return ret;
}
static void *erase_worker_func(struct w_list *w)
{
#define Libburn_protect_erase_threaD 1
#ifdef Libburn_protect_erase_threaD
sigset_t sigset, oldset;
/* Protect blank thread from being interrupted by external signals */
sigfillset(&sigset);
sigdelset(&sigset, SIGSEGV);
sigdelset(&sigset, SIGILL);
pthread_sigmask(SIG_SETMASK, &sigset, &oldset);
#endif /* Libburn_protect_erase_threaD */
burn_disc_erase_sync(w->u.erase.drive, w->u.erase.fast);
remove_worker(pthread_self());
#ifdef Libburn_protect_erase_threaD
/* (just in case it would not end with all signals blocked) */
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
#endif /* Libburn_protect_erase_threaD */
return NULL;
}
void burn_disc_erase(struct burn_drive *drive, int fast)
{
union w_list_data o;
/* ts A61006 */
/* a ssert(drive); */
/* a ssert(!SCAN_GOING()); */
/* a ssert(!find_worker(drive)); */
if(drive == NULL) {
libdax_msgs_submit(libdax_messenger, -1,
0x00020104,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"NULL pointer caught in burn_disc_erase", 0, 0);
return;
}
if ((SCAN_GOING()) || find_worker(drive) != NULL) {
libdax_msgs_submit(libdax_messenger, drive->global_index,
0x00020102,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"A drive operation is still going on (want to erase)",
0, 0);
return;
}
reset_progress(drive, 1, 1, 1, 0x10000, 0);
/* A70103 : will be set to 0 by burn_disc_erase_sync() */
drive->cancel = 1;
/* ts A70103 moved up from burn_disc_erase_sync() */
/* ts A60825 : allow on parole to blank appendable CDs */
/* ts A70131 : allow blanking of overwritable DVD-RW (profile 0x13) */
/* ts A70216 : allow blanking of CD-RW or DVD-RW in any regular state
and of any kind of full media */
/* ts A70909 : the willingness to burn any BURN_DISC_FULL media is
inappropriate. One would rather need a -force option
Note: keep this in sync with mmc_read_disc_info() */
/* ts B10321 : Allowed role 5 to be blanked */
if ((drive->drive_role == 1 &&
drive->current_profile != 0x0a &&
drive->current_profile != 0x13 &&
drive->current_profile != 0x14 &&
drive->status != BURN_DISC_FULL)
||
(drive->status != BURN_DISC_FULL &&
drive->status != BURN_DISC_APPENDABLE &&
drive->status != BURN_DISC_BLANK)
||
(drive->drive_role != 1 && drive->drive_role != 5)
) {
char msg[160];
sprintf(msg, "Drive and media state unsuitable for blanking. (role= %d , profile= 0x%x , status= %d)",
drive->drive_role,
(unsigned int) drive->current_profile,
drive->status);
libdax_msgs_submit(libdax_messenger, drive->global_index,
0x00020130,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return;
}
o.erase.drive = drive;
o.erase.fast = fast;
add_worker(Burnworker_type_erasE, drive,
(WorkerFunc) erase_worker_func, &o);
}
/* ts A61230 */
static void *format_worker_func(struct w_list *w)
{
#define Libburn_protect_format_threaD 1
#ifdef Libburn_protect_format_threaD
sigset_t sigset, oldset;
/* Protect format thread from being interrupted by external signals */
sigfillset(&sigset);
sigdelset(&sigset, SIGSEGV);
sigdelset(&sigset, SIGILL);
pthread_sigmask(SIG_SETMASK, &sigset, &oldset);
#endif /* Libburn_protect_format_threaD */
burn_disc_format_sync(w->u.format.drive, w->u.format.size,
w->u.format.flag);
remove_worker(pthread_self());
#ifdef Libburn_protect_format_threaD
/* (just in case it would not end with all signals blocked) */
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
#endif /* Libburn_protect_format_threaD */
return NULL;
}
/* ts A61230 */
void burn_disc_format(struct burn_drive *drive, off_t size, int flag)
{
union w_list_data o;
int ok = 0, ret;
char msg[40];
reset_progress(drive, 1, 1, 1, 0x10000, 0);
if ((SCAN_GOING()) || find_worker(drive) != NULL) {
libdax_msgs_submit(libdax_messenger, drive->global_index,
0x00020102,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"A drive operation is still going on (want to format)",
0, 0);
return;
}
if (drive->drive_role != 1) {
libdax_msgs_submit(libdax_messenger, drive->global_index,
0x00020146,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Drive is a virtual placeholder", 0, 0);
drive->cancel = 1;
return;
}
if (flag & 128) /* application prescribed format type */
flag |= 16; /* enforce re-format */
if (drive->current_profile == 0x14)
ok = 1; /* DVD-RW sequential */
else if (drive->current_profile == 0x13 && (flag & 16))
ok = 1; /* DVD-RW Restricted Overwrite with force bit */
else if (drive->current_profile == 0x1a) {
ok = 1; /* DVD+RW */
size = 0;
flag &= ~(2|8); /* no insisting in size 0, no expansion */
flag |= 4; /* format up to maximum size */
} else if (drive->current_profile == 0x12) {
ok = 1; /* DVD-RAM */
} else if (drive->current_profile == 0x41) {
/* BD-R SRM */
ok= 1;
ret = drive->read_format_capacities(drive, 0x00);
if (ret > 0 &&
drive->format_descr_type == BURN_FORMAT_IS_FORMATTED)
ok = 0;
if (drive->status != BURN_DISC_BLANK)
ok = 0;
if (!ok) {
libdax_msgs_submit(libdax_messenger,
drive->global_index, 0x00020162,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"BD-R not unformatted blank any more. Cannot format.",
0, 0);
drive->cancel = 1;
return;
}
if (flag & 32) {
libdax_msgs_submit(libdax_messenger,
drive->global_index, 0x00020163,
LIBDAX_MSGS_SEV_NOTE, LIBDAX_MSGS_PRIO_HIGH,
"Blank BD-R left unformatted for zero spare capacity.",
0, 0);
return;
}
} else if (drive->current_profile == 0x43) {
ok = 1; /* BD-RE */
if ((flag & 32) && !(drive->current_feat23h_byte4 & 8)) {
libdax_msgs_submit(libdax_messenger,
drive->global_index, 0x00020164,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"Drive does not format BD-RE without spares.",
0, 0);
drive->cancel = 1;
return;
}
}
if (!ok) {
sprintf(msg,"Will not format media type %4.4Xh",
drive->current_profile);
libdax_msgs_submit(libdax_messenger, drive->global_index,
0x00020129,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
drive->cancel = 1;
return;
}
o.format.drive = drive;
o.format.size = size;
o.format.flag = flag;
add_worker(Burnworker_type_formaT, drive,
(WorkerFunc) format_worker_func, &o);
}
static void *write_disc_worker_func(struct w_list *w)
{
struct burn_drive *d = w->u.write.drive;
char msg[80];
#define Libburn_protect_write_threaD 1
#ifdef Libburn_protect_write_threaD
sigset_t sigset, oldset;
/* Protect write thread from being interrupted by external signals */
sigfillset(&sigset);
sigdelset(&sigset, SIGSEGV);
sigdelset(&sigset, SIGILL);
pthread_sigmask(SIG_SETMASK, &sigset, &oldset);
#endif /* Libburn_protect_write_threaD */
d->thread_pid = getpid();
d->thread_tid = pthread_self();
d->thread_pid_valid= 1;
burn_disc_write_sync(w->u.write.opts, w->u.write.disc);
d->thread_pid_valid= 0;
d->thread_pid = 0;
/* the options are refcounted, free out ref count which we added below
*/
burn_write_opts_free(w->u.write.opts);
sprintf(msg, "Write thread on drive %d ended", d->global_index);
libdax_msgs_submit(libdax_messenger, d->global_index, 0x00020178,
LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
remove_worker(pthread_self());
d->busy = BURN_DRIVE_IDLE;
#ifdef Libburn_protect_write_threaD
/* (just in case it would not end with all signals blocked) */
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
#endif /* Libburn_protect_write_threaD */
return NULL;
}
void burn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
{
union w_list_data o;
char *reasons= NULL;
struct burn_drive *d;
int mvalid;
d = opts->drive;
/* ts A61006 */
/* a ssert(!SCAN_GOING()); */
/* a ssert(!find_worker(opts->drive)); */
if ((SCAN_GOING()) || find_worker(opts->drive) != NULL) {
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020102,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"A drive operation is still going on (want to write)",
0, 0);
return;
}
reset_progress(d, disc->sessions, disc->session[0]->tracks,
disc->session[0]->track[0]->indices, 0, 0);
/* For the next lines any return indicates failure */
d->cancel = 1;
/* ts A70203 : people have been warned in API specs */
if (opts->write_type == BURN_WRITE_NONE) {
libdax_msgs_submit(libdax_messenger, d->global_index,
0x0002017c,
LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
"No valid write type selected", 0, 0);
return;
}
if (d->drive_role == 0) {
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020146,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Drive is a virtual placeholder (null-drive)", 0, 0);
return;
}
if (d->drive_role == 4) {
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020181,
LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
"Pseudo-drive is a read-only file. Cannot write.",
0, 0);
return;
}
/* ts A61007 : obsolete Assert in spc_select_write_params() */
if (d->drive_role == 1) {
mvalid = 0;
if (d->mdata != NULL)
mvalid = 1;
if (!mvalid) {
libdax_msgs_submit(libdax_messenger,
d->global_index, 0x00020113,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"Drive capabilities not inquired yet", 0, 0);
return;
}
}
/* ts A70219 : intended to replace all further tests here and many
tests in burn_*_write_sync()
*/
BURN_ALLOC_MEM_VOID(reasons, char, BURN_REASONS_LEN + 80);
strcpy(reasons, "Write job parameters are unsuitable:\n");
if (burn_precheck_write(opts, disc, reasons + strlen(reasons), 1)
<= 0) {
libdax_msgs_submit(libdax_messenger,
d->global_index, 0x00020139,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
reasons, 0, 0);
goto ex;
}
BURN_FREE_MEM(reasons); reasons= NULL;
/* ts A90106 : early catching of unformatted BD-RE */
if (d->current_profile == 0x43)
if (d->read_format_capacities(d, 0x00) > 0 &&
d->format_descr_type != BURN_FORMAT_IS_FORMATTED) {
libdax_msgs_submit(libdax_messenger,
d->global_index, 0x00020168,
LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
"Media not properly formatted. Cannot write.",
0, 0);
return;
}
d->cancel = 0; /* End of the return = failure area */
o.write.drive = d;
o.write.opts = opts;
o.write.disc = disc;
opts->refcount++;
add_worker(Burnworker_type_writE, d,
(WorkerFunc) write_disc_worker_func, &o);
ex:;
BURN_FREE_MEM(reasons);
}
static void *fifo_worker_func(struct w_list *w)
{
#define Libburn_protect_fifo_threaD 1
#ifdef Libburn_protect_fifo_threaD
sigset_t sigset, oldset;
/* Protect fifo thread from being interrupted by external signals */
sigfillset(&sigset);
sigdelset(&sigset, SIGSEGV);
sigdelset(&sigset, SIGILL);
pthread_sigmask(SIG_SETMASK, &sigset, &oldset);
#endif /* Libburn_protect_fifo_threaD */
burn_fifo_source_shoveller(w->u.fifo.source, w->u.fifo.flag);
remove_worker(pthread_self());
#ifdef Libburn_protect_fifo_threaD
/* (just in case it would not end with all signals blocked) */
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
#endif /* Libburn_protect_fifo_threaD */
return NULL;
}
int burn_fifo_start(struct burn_source *source, int flag)
{
union w_list_data o;
struct burn_source_fifo *fs = source->data;
fs->is_started = -1;
/* create and set up ring buffer */;
fs->buf = burn_os_alloc_buffer(
((size_t) fs->chunksize) * (size_t) fs->chunks, 0);
if (fs->buf == NULL) {
/* >>> could not start ring buffer */;
return -1;
}
o.fifo.source = source;
o.fifo.flag = flag;
add_worker(Burnworker_type_fifO, NULL,
(WorkerFunc) fifo_worker_func, &o);
fs->is_started = 1;
return 1;
}
int burn_fifo_abort(struct burn_source_fifo *fs, int flag)
{
int ret;
pthread_t pt;
burn_async_manage_lock(BURN_ASYNC_LOCK_OBTAIN);
if (fs->thread_is_valid <= 0 || fs->thread_handle == NULL) {
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
return 2;
}
pt = *((pthread_t *) fs->thread_handle);
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
fs->do_abort = 1;
ret = pthread_join(pt, NULL);
return (ret == 0);
}
#ifdef Libburn_has_burn_async_join_alL
/* ts A71019 : never used */
void burn_async_join_all(void)
{
void *ret;
while (workers)
pthread_join(workers->thread, &ret);
}
#endif /* Libburn_has_burn_async_join_alL */
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