Chapter 8. Carefully Call Out to Other Resources


Do not put your trust in princes, in mortal men, who cannot save.

 Psalms 146:3 (NIV)

Practically no program is truly self-contained; nearly all programs call out to other programs for resources, such as programs provided by the operating system, software libraries, and so on. Sometimes this calling out to other resources isn't obvious or involves a great deal of ``hidden'' infrastructure which must be depended on, e.g., the mechanisms to implement dynamic libraries. Clearly, you must be careful about what other resources your program trusts and you must make sure that the way you send requests to them.

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