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<p>An API is a contract between a caller and a callee. The most common forms of API abuse are caused by the caller failing to honor its end of this contract. For example, if a program fails to call <span id="theCode">chdir()</span> after calling <span id="theCode">chroot()</span>, it violates the contract that specifies how to change the active root directory in a secure fashion. Another good example of library abuse is expecting the callee to return trustworthy DNS information to the caller. In this case, the caller abuses the callee API by making certain assumptions about its behavior (that the return value can be used for authentication purposes). One can also violate the caller-callee contract from the other side. For example, if a coder subclasses <span id="theCode">SecureRandom</span> and returns a non-random value, the contract is violated.</p>

form of bribery in which payment is received for services rendered