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fix to access to shared memory that doesnt exist (#638)

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* fix to access to shared memory that doesnt exist

* fix for freeing shm and then setting hostname from API

* exception error message moved to private function

* refactoring to avoid allocating intermediate string
This commit is contained in:
Dhanya Thattil 2023-02-13 11:29:54 +01:00 committed by GitHub
parent 18136fed9d
commit 5c8c3ae3f3
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2 changed files with 23 additions and 7 deletions
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9
slsDetectorSoftware/src/DetectorImpl.cpp
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@ -253,14 +253,15 @@ void DetectorImpl::setVirtualDetectorServers(const int numdet, const int port) {
}
void DetectorImpl::setHostname(const std::vector<std::string> &name) {
// this check is there only to allow the previous detsizechan command
if (shm()->totalNumberOfModules != 0) {
// do not free always to allow the previous detsize/ initialchecks command
if (shm.exists() && shm()->totalNumberOfModules != 0) {
LOG(logWARNING) << "There are already module(s) in shared memory."
"Freeing Shared memory now.";
bool initialChecks = shm()->initialChecks;
freeSharedMemory();
}
// could be called after freeing shm from API
if (!shm.exists()) {
setupDetector();
shm()->initialChecks = initialChecks;
}
for (const auto &hostname : name) {
addModule(hostname);

21
slsDetectorSoftware/src/SharedMemory.h
View File

@ -33,7 +33,7 @@ namespace sls {
template <typename T> class SharedMemory {
static constexpr int NAME_MAX_LENGTH = 255;
std::string name;
T *shared_struct{};
T *shared_struct{nullptr};
public:
// moduleid of -1 creates a detector only shared memory
@ -64,8 +64,18 @@ template <typename T> class SharedMemory {
unmapSharedMemory();
}
T *operator()() { return shared_struct; }
const T *operator()() const { return shared_struct; }
T *operator()() {
if (shared_struct)
return shared_struct;
throw SharedMemoryError(getNoShmAccessMessage());
}
const T *operator()() const {
if (shared_struct)
return shared_struct;
throw SharedMemoryError(getNoShmAccessMessage());
}
std::string getName() const { return name; }
bool exists() {
@ -204,6 +214,11 @@ template <typename T> class SharedMemory {
throw SharedMemoryError(msg);
}
}
const char* getNoShmAccessMessage() const {
return ("No shared memory to access. Create it first with "
"hostname or config command.");
};
};
} // namespace sls