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minor fix for canonical read handling

This commit is contained in:
Robin Müller 2021-08-22 20:24:50 +02:00
parent 5454169e20
commit afd375a7f8
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GPG Key ID: 71B58F8A3CDFA9AC
1 changed files with 18 additions and 3 deletions
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21
hal/src/fsfw_hal/linux/uart/UartComIF.cpp
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@ -1,6 +1,7 @@
#include "fsfw_hal/linux/uart/UartComIF.h"
#include "UartComIF.h"
#include "OBSWConfig.h"
#include "fsfw_hal/linux/utility.h"
#include "fsfw/serviceinterface/ServiceInterface.h"
#include <cstring>
@ -353,12 +354,13 @@ ReturnValue_t UartComIF::handleCanonicalRead(UartCookie& uartCookie, UartDeviceM
size_t maxReplySize = uartCookie.getMaxReplyLen();
int fd = iter->second.fileDescriptor;
auto bufferPtr = iter->second.replyBuffer.data();
iter->second.replyLen = 0;
do {
size_t allowedReadSize = 0;
if(currentBytesRead >= maxReplySize) {
// Overflow risk. Emit warning, trigger event and break. If this happens,
// the reception buffer is not large enough or data is not polled often enough.
#if OBSW_VERBOSE_LEVEL >= 1
#if FSFW_VERBOSE_LEVEL >= 1
#if FSFW_CPP_OSTREAM_ENABLED == 1
sif::warning << "UartComIF::requestReceiveMessage: Next read would cause overflow!"
<< std::endl;
@ -376,7 +378,20 @@ ReturnValue_t UartComIF::handleCanonicalRead(UartCookie& uartCookie, UartDeviceM
bytesRead = read(fd, bufferPtr, allowedReadSize);
if (bytesRead < 0) {
return RETURN_FAILED;
// EAGAIN: No data available in non-blocking mode
if(errno != EAGAIN) {
#if FSFW_VERBOSE_LEVEL >= 1
#if FSFW_CPP_OSTREAM_ENABLED == 1
sif::warning << "UartComIF::handleCanonicalRead: read failed with code" <<
errno << ": " << strerror(errno) << std::endl;
#else
sif::printWarning("UartComIF::handleCanonicalRead: read failed with code %d: %s\n",
errno, strerror(errno));
#endif
#endif
return RETURN_FAILED;
}
}
else if(bytesRead > 0) {
iter->second.replyLen += bytesRead;