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POSIX FTDI: Nicer error message for when device is in use 

Commonly, the device is being used by another libicsneo program
(icsscand, maybe) or passed through to a VM.
pull/25/head
Paul Hollinsky 2020-06-24 22:15:22 -04:00
parent a759c1faa9
commit 2079037ae4
3 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
api/icsneocpp/event.cpp
View File

@ -101,6 +101,7 @@ static constexpr const char* DRIVER_FAILED_TO_OPEN = "The device driver encounte
static constexpr const char* DRIVER_FAILED_TO_CLOSE = "The device driver encountered a low-level error while closing the device.";
static constexpr const char* PACKET_CHECKSUM_ERROR = "There was a checksum error while decoding a packet. The packet was dropped.";
static constexpr const char* TRANSMIT_BUFFER_FULL = "The transmit buffer is full and the device is set to non-blocking.";
static constexpr const char* DEVICE_IN_USE = "The device is currently in use by another program.";
static constexpr const char* PCAP_COULD_NOT_START = "The PCAP driver could not be started. Ethernet devices will not be found.";
static constexpr const char* PCAP_COULD_NOT_FIND_DEVICES = "The PCAP driver failed to find devices. Ethernet devices will not be found.";
static constexpr const char* PACKET_DECODING = "The packet could not be decoded.";
@ -197,6 +198,8 @@ const char* APIEvent::DescriptionForType(Type type) {
return PACKET_CHECKSUM_ERROR;
case Type::TransmitBufferFull:
return TRANSMIT_BUFFER_FULL;
case Type::DeviceInUse:
return DEVICE_IN_USE;
case Type::PCAPCouldNotStart:
return PCAP_COULD_NOT_START;
case Type::PCAPCouldNotFindDevices:

1
include/icsneo/api/event.h
View File

@ -78,6 +78,7 @@ public:
DriverFailedToClose = 0x3003,
PacketChecksumError = 0x3004,
TransmitBufferFull = 0x3005,
DeviceInUse = 0x3006,
PCAPCouldNotStart = 0x3102,
PCAPCouldNotFindDevices = 0x3103,
PacketDecodingError = 0x3104,

6
platform/posix/ftdi.cpp
View File

@ -56,7 +56,11 @@ bool FTDI::open() {
// At this point the handle has been checked to be within the bounds of the handles array
std::tuple<int, std::string>& handle = handles[device.handle];
if(ftdi.openDevice(std::get<0>(handle), std::get<1>(handle).c_str()) != 0) {
const int openError = ftdi.openDevice(std::get<0>(handle), std::get<1>(handle).c_str());
if(openError == -5) { // Unable to claim device
report(APIEvent::Type::DeviceInUse, APIEvent::Severity::Error);
return false;
} else if(openError != 0) {
report(APIEvent::Type::DriverFailedToOpen, APIEvent::Severity::Error);
return false;
}