Warns on unused function return values. Many of the standard library functions return a value that indicates if the call was successful. Ignoring the returned value can cause unexpected behavior if an error has occurred. The following functions are checked:

This check is an alias of check bugprone-unused-return-value with a fixed set of functions.

The check corresponds to a part of CERT C Coding Standard rule ERR33-C. Detect and handle standard library errors. The list of checked functions is taken from the rule, with following exception: