================
@@ -1188,6 +1192,18 @@ void StreamChecker::evalSetFeofFerror(const
FnDescription *Desc,
C.addTransition(State);
}
+void StreamChecker::preFflush(const FnDescription *Desc, const CallEvent &Call,
+ CheckerContext &C) const {
+ // Skip if the stream is NULL/nullptr, which means flush all streams.
+ if (!Call.getArgExpr(Desc->StreamArgNo)
----------------
balazske wrote:
This check does not work in this case:
```
FILE *F = NULL;
fflush(F);
```
I think you should copy function `ensureStreamNonNull` to here and change it
such that it makes a check for opened stream in the non-null case. In case of
null stream no error is needed, and at unknown stream no assumption is needed
about the non-nullness of the stream.
https://github.com/llvm/llvm-project/pull/74296
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