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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
2 changed files with 23 additions and 7 deletions
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21
slsDetectorSoftware/src/SharedMemory.h
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@ -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