struct libusb_device *usbi_alloc_device(struct libusb_context *ctx,
unsigned long session_id)
{
size_t priv_size = usbi_backend->device_priv_size;
struct libusb_device *dev = calloc(1, sizeof(*dev) + priv_size);
int r;
if (!dev)
return NULL;
r = usbi_mutex_init(&dev->lock, NULL);
if (r) {
free(dev);
return NULL;
}
dev->ctx = ctx;
dev->refcnt = 1;
dev->session_data = session_id;
dev->speed = LIBUSB_SPEED_UNKNOWN;
memset(&dev->os_priv, 0, priv_size);
usbi_mutex_lock(&ctx->usb_devs_lock);
list_add(&dev->list, &ctx->usb_devs);
usbi_mutex_unlock(&ctx->usb_devs_lock);
return dev;
}
/* Before using the hash table we must allocate memory for it.
We allocate one element more as the found prime number says.
This is done for more effective indexing as explained in the
comment for the hash function. */
static bool htab_create(struct libusb_context *ctx, unsigned long nel)
{
if (htab_table != NULL) {
usbi_err(ctx, "hash table already allocated");
return true;
}
// Create a mutex
usbi_mutex_init(&htab_write_mutex);
// Change nel to the first prime number not smaller as nel.
nel |= 1;
while (!isprime(nel))
nel += 2;
htab_size = nel;
usbi_dbg("using %lu entries hash table", nel);
htab_filled = 0;
// allocate memory and zero out.
htab_table = calloc(htab_size + 1, sizeof(htab_entry));
if (htab_table == NULL) {
usbi_err(ctx, "could not allocate space for hash table");
return false;
}
return true;
}
struct libusb_device *usbi_alloc_device(struct libusb_context *ctx,
unsigned long session_id)
{
size_t priv_size = usbi_backend->device_priv_size;
struct libusb_device *dev = calloc(1, sizeof(*dev) + priv_size);
int r;
if (!dev)
return NULL;
r = usbi_mutex_init(&dev->lock, NULL);
if (r) {
free(dev);
return NULL;
}
dev->ctx = ctx;
dev->refcnt = 1;
dev->session_data = session_id;
dev->speed = LIBUSB_SPEED_UNKNOWN;
if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
usbi_connect_device (dev);
}
return dev;
}
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;
}
/* Before using the hash table we must allocate memory for it.
We allocate one element more as the found prime number says.
This is done for more effective indexing as explained in the
comment for the hash function. */
static bool htab_create(struct libusb_context *ctx)
{
if (htab_table != NULL) {
usbi_err(ctx, "hash table already allocated");
return true;
}
// Create a mutex
usbi_mutex_init(&htab_mutex);
usbi_dbg("using %lu entries hash table", HTAB_SIZE);
htab_filled = 0;
// allocate memory and zero out.
htab_table = calloc(HTAB_SIZE + 1, sizeof(htab_entry));
if (htab_table == NULL) {
usbi_err(ctx, "could not allocate space for hash table");
return false;
}
return true;
}
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;
}
