void API_EXPORTED libusb_exit(struct libusb_context *ctx)
{
usbi_dbg("");
USBI_GET_CONTEXT(ctx);
if (ctx == usbi_default_context) {
usbi_mutex_static_lock(&default_context_lock);
if (--default_context_refcnt > 0) {
usbi_dbg("not destroying default context");
usbi_mutex_static_unlock(&default_context_lock);
return;
}
usbi_dbg("destroying default context");
usbi_default_context = NULL;
usbi_mutex_static_unlock(&default_context_lock);
}
if (!list_empty(&ctx->open_devs))
usbi_warn(ctx, "application left some devices open");
usbi_io_exit(ctx);
if (usbi_backend->exit)
usbi_backend->exit();
usbi_mutex_destroy(&ctx->open_devs_lock);
usbi_mutex_destroy(&ctx->usb_devs_lock);
free(ctx);
}
void API_EXPORTED libusb_unref_device(libusb_device *dev)
{
int refcnt;
if (!dev)
return;
usbi_mutex_lock(&dev->lock);
refcnt = --dev->refcnt;
usbi_mutex_unlock(&dev->lock);
if (refcnt == 0) {
usbi_dbg("destroy device %d.%d", dev->bus_number, dev->device_address);
if (usbi_backend->destroy_device)
usbi_backend->destroy_device(dev);
usbi_mutex_lock(&dev->ctx->usb_devs_lock);
list_del(&dev->list);
usbi_mutex_unlock(&dev->ctx->usb_devs_lock);
usbi_mutex_destroy(&dev->lock);
free(dev);
}
}
/* After using the hash table it has to be destroyed. */
static void htab_destroy(void)
{
unsigned long i;
if (htab_table == NULL)
return;
for (i = 0; i < HTAB_SIZE; i++)
free(htab_table[i].str);
safe_free(htab_table);
usbi_mutex_destroy(&htab_mutex);
}
static void do_close(struct libusb_context *ctx,
struct libusb_device_handle *dev_handle)
{
struct usbi_transfer *itransfer;
struct usbi_transfer *tmp;
libusb_lock_events(ctx);
usbi_mutex_lock(&ctx->flying_transfers_lock);
list_for_each_entry_safe(itransfer, tmp, &ctx->flying_transfers, list, struct usbi_transfer) {
struct libusb_transfer *transfer =
USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
if (transfer->dev_handle != dev_handle)
continue;
if (!(itransfer->flags & USBI_TRANSFER_DEVICE_DISAPPEARED)) {
usbi_err(ctx, "Device handle closed while transfer was still being processed, but the device is still connected as far as we know");
if (itransfer->flags & USBI_TRANSFER_CANCELLING)
usbi_warn(ctx, "A cancellation for an in-flight transfer hasn't completed but closing the device handle");
else
usbi_err(ctx, "A cancellation hasn't even been scheduled on the transfer for which the device is closing");
}
usbi_mutex_lock(&itransfer->lock);
list_del(&itransfer->list);
transfer->dev_handle = NULL;
usbi_mutex_unlock(&itransfer->lock);
usbi_dbg("Removed transfer %p from the in-flight list because device handle %p closed",
transfer, dev_handle);
}
usbi_mutex_unlock(&ctx->flying_transfers_lock);
libusb_unlock_events(ctx);
usbi_mutex_lock(&ctx->open_devs_lock);
list_del(&dev_handle->list);
usbi_mutex_unlock(&ctx->open_devs_lock);
usbi_backend->close(dev_handle);
libusb_unref_device(dev_handle->dev);
usbi_mutex_destroy(&dev_handle->lock);
free(dev_handle);
}
/* After using the hash table it has to be destroyed. */
static void htab_destroy(void)
{
unsigned long i;
if (htab_table == NULL)
return;
for (i = 0; i < htab_size; i++) {
if (htab_table[i].used)
safe_free(htab_table[i].str);
}
usbi_mutex_destroy(&htab_write_mutex);
safe_free(htab_table);
}
int API_EXPORTED libusb_open(libusb_device *dev,
libusb_device_handle **handle)
{
struct libusb_context *ctx = DEVICE_CTX(dev);
struct libusb_device_handle *_handle;
size_t priv_size = usbi_backend->device_handle_priv_size;
int r;
usbi_dbg("open %d.%d", dev->bus_number, dev->device_address);
_handle = malloc(sizeof(*_handle) + priv_size);
if (!_handle)
return LIBUSB_ERROR_NO_MEM;
r = usbi_mutex_init(&_handle->lock, NULL);
if (r) {
free(_handle);
return LIBUSB_ERROR_OTHER;
}
_handle->dev = libusb_ref_device(dev);
_handle->claimed_interfaces = 0;
memset(&_handle->os_priv, 0, priv_size);
r = usbi_backend->open(_handle);
if (r < 0) {
usbi_dbg("open %d.%d returns %d", dev->bus_number, dev->device_address, r);
libusb_unref_device(dev);
usbi_mutex_destroy(&_handle->lock);
free(_handle);
return r;
}
usbi_mutex_lock(&ctx->open_devs_lock);
list_add(&_handle->list, &ctx->open_devs);
usbi_mutex_unlock(&ctx->open_devs_lock);
*handle = _handle;
usbi_fd_notification(ctx);
return 0;
}
int API_EXPORTED libusb_init(libusb_context **context)
{
char *dbg = getenv("LIBUSB_DEBUG");
struct libusb_context *ctx;
int r = 0;
usbi_mutex_static_lock(&default_context_lock);
if (!context && usbi_default_context) {
usbi_dbg("reusing default context");
default_context_refcnt++;
usbi_mutex_static_unlock(&default_context_lock);
return 0;
}
ctx = malloc(sizeof(*ctx));
if (!ctx) {
r = LIBUSB_ERROR_NO_MEM;
goto err_unlock;
}
memset(ctx, 0, sizeof(*ctx));
if (dbg) {
ctx->debug = atoi(dbg);
if (ctx->debug)
ctx->debug_fixed = 1;
}
usbi_dbg("libusb-%d.%d.%d%s%s%s",
libusb_version_internal.major,
libusb_version_internal.minor,
libusb_version_internal.micro,
libusb_version_internal.rc,
libusb_version_internal.describe[0] ? " git:" : "",
libusb_version_internal.describe);
if (usbi_backend->init) {
r = usbi_backend->init(ctx);
if (r)
goto err_free_ctx;
}
usbi_mutex_init(&ctx->usb_devs_lock, NULL);
usbi_mutex_init(&ctx->open_devs_lock, NULL);
list_init(&ctx->usb_devs);
list_init(&ctx->open_devs);
r = usbi_io_init(ctx);
if (r < 0) {
if (usbi_backend->exit)
usbi_backend->exit();
goto err_destroy_mutex;
}
if (context) {
*context = ctx;
} else if (!usbi_default_context) {
usbi_dbg("created default context");
usbi_default_context = ctx;
default_context_refcnt++;
}
usbi_mutex_static_unlock(&default_context_lock);
return 0;
err_destroy_mutex:
usbi_mutex_destroy(&ctx->open_devs_lock);
usbi_mutex_destroy(&ctx->usb_devs_lock);
err_free_ctx:
free(ctx);
err_unlock:
usbi_mutex_static_unlock(&default_context_lock);
return r;
}
