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Don't block in Android USB device open

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We might be waiting a long time for a permissions dialog, so let that complete asynchronously. While that's happening, we'll remove the device from the device list so that when we get permission the application sees the device as newly available and can open it again.

Fixes https://github.com/libsdl-org/SDL/issues/6347
This commit is contained in:
Sam Lantinga 2024-10-17 11:27:15 -07:00
parent 60c3eaf5ee
commit 41366f73b2
2 changed files with 76 additions and 87 deletions
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113
src/hidapi/android/hid.cpp
View file

@ -500,46 +500,38 @@ public:
return false;
}
m_bIsWaitingForOpen = false;
m_bOpenResult = env->CallBooleanMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerOpen, m_nId );
ExceptionCheck( env, "BOpen" );
if ( m_bIsWaitingForOpen )
{
hid_mutex_guard cvl( &m_cvLock );
const int OPEN_TIMEOUT_SECONDS = 60;
struct timespec ts, endtime;
clock_gettime( CLOCK_REALTIME, &ts );
endtime = ts;
endtime.tv_sec += OPEN_TIMEOUT_SECONDS;
do
{
if ( pthread_cond_timedwait( &m_cv, &m_cvLock, &endtime ) != 0 )
{
break;
}
}
while ( m_bIsWaitingForOpen && get_timespec_ms( ts ) < get_timespec_ms( endtime ) );
SDL_SetError( "Waiting for permission" );
return false;
}
if ( !m_bOpenResult )
{
m_bOpenResult = env->CallBooleanMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerOpen, m_nId );
ExceptionCheck( env, "BOpen" );
if ( m_bIsWaitingForOpen )
{
LOGV( "Device open failed - timed out waiting for device permission" );
LOGV( "Device open waiting for permission" );
SDL_SetError( "Waiting for permission" );
m_bWasOpenPending = true;
return false;
}
else
if ( !m_bOpenResult )
{
LOGV( "Device open failed" );
SDL_SetError( "Device open failed" );
return false;
}
return false;
}
m_pDevice = new hid_device;
m_pDevice->m_nId = m_nId;
m_pDevice->m_nDeviceRefCount = 1;
LOGD("Creating device %d (%p), refCount = 1\n", m_pDevice->m_nId, m_pDevice);
return true;
}
@ -548,16 +540,44 @@ public:
m_bIsWaitingForOpen = true;
}
bool BOpenPending() const
{
return m_bIsWaitingForOpen;
}
void SetWasOpenPending( bool bState )
{
m_bWasOpenPending = bState;
}
bool BWasOpenPending() const
{
return m_bWasOpenPending;
}
void SetOpenResult( bool bResult )
{
if ( m_bIsWaitingForOpen )
{
m_bOpenResult = bResult;
m_bIsWaitingForOpen = false;
pthread_cond_signal( &m_cv );
if ( m_bOpenResult )
{
LOGV( "Device open succeeded" );
}
else
{
LOGV( "Device open failed" );
}
}
}
bool BOpenResult() const
{
return m_bOpenResult;
}
void ProcessInput( const uint8_t *pBuf, size_t nBufSize )
{
hid_mutex_guard l( &m_dataLock );
@ -606,18 +626,16 @@ public:
{
JNIEnv *env = SDL_GetAndroidJNIEnv();
int nRet = -1;
if ( g_HIDDeviceManagerCallbackHandler )
{
jbyteArray pBuf = NewByteArray( env, pData, nDataLen );
nRet = env->CallIntMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerWriteReport, m_nId, pBuf, bFeature );
ExceptionCheck( env, "WriteReport" );
env->DeleteLocalRef( pBuf );
}
else
if ( !g_HIDDeviceManagerCallbackHandler )
{
LOGV( "WriteReport without callback handler" );
return -1;
}
jbyteArray pBuf = NewByteArray( env, pData, nDataLen );
int nRet = env->CallIntMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerWriteReport, m_nId, pBuf, bFeature );
ExceptionCheck( env, "WriteReport" );
env->DeleteLocalRef( pBuf );
return nRet;
}
@ -713,8 +731,11 @@ public:
if ( g_HIDDeviceManagerCallbackHandler )
{
env->CallVoidMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerClose, m_nId );
ExceptionCheck( env, "Close" );
if ( !m_bIsWaitingForOpen && m_bOpenResult )
{
env->CallVoidMethod( g_HIDDeviceManagerCallbackHandler, g_midHIDDeviceManagerClose, m_nId );
ExceptionCheck( env, "Close" );
}
}
hid_mutex_guard dataLock( &m_dataLock );
@ -749,6 +770,7 @@ private:
pthread_mutex_t m_cvLock = PTHREAD_MUTEX_INITIALIZER; // This lock has to be held to access any variables below
pthread_cond_t m_cv = PTHREAD_COND_INITIALIZER;
bool m_bIsWaitingForOpen = false;
bool m_bWasOpenPending = false;
bool m_bOpenResult = false;
bool m_bIsWaitingForReportResponse = false;
int m_nReportResponseError = 0;
@ -1045,6 +1067,18 @@ struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned shor
hid_mutex_guard l( &g_DevicesMutex );
for ( hid_device_ref<CHIDDevice> pDevice = g_Devices; pDevice; pDevice = pDevice->next )
{
// Don't enumerate devices that are currently being opened, we'll re-enumerate them when we're done
// Make sure we skip them at least once, so they get removed and then re-added to the caller's device list
if ( pDevice->BWasOpenPending() )
{
// Don't enumerate devices that failed to open, otherwise the application might try to keep prompting for access
if ( !pDevice->BOpenPending() && pDevice->BOpenResult() )
{
pDevice->SetWasOpenPending( false );
}
continue;
}
const hid_device_info *info = pDevice->GetDeviceInfo();
/* See if there are any devices we should skip in enumeration */
@ -1105,7 +1139,12 @@ HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path)
}
}
}
if ( pDevice && pDevice->BOpen() )
if ( !pDevice )
{
SDL_SetError( "Couldn't find device with path %s", path );
return NULL;
}
if ( pDevice->BOpen() )
{
return pDevice->GetDevice();
}
@ -1116,7 +1155,7 @@ int HID_API_EXPORT HID_API_CALL hid_write(hid_device *device, const unsigned ch
{
if ( device )
{
LOGV( "hid_write id=%d length=%zu", device->m_nId, length );
// LOGV( "hid_write id=%d length=%zu", device->m_nId, length );
hid_device_ref<CHIDDevice> pDevice = FindDevice( device->m_nId );
if ( pDevice )
{
@ -1180,7 +1219,7 @@ int HID_API_EXPORT HID_API_CALL hid_read_timeout(hid_device *device, unsigned ch
// TODO: Implement blocking
int HID_API_EXPORT HID_API_CALL hid_read(hid_device *device, unsigned char *data, size_t length)
{
LOGV( "hid_read id=%d length=%zu", device->m_nId, length );
// LOGV( "hid_read id=%d length=%zu", device->m_nId, length );
return hid_read_timeout( device, data, length, 0 );
}