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Configuration Configuration settings of the posix library.
Configuration settings are C pre-processor constants. They can be set with a #define in the iot_config.h or by using a compiler option such as -D in gcc. If a configuration setting is not defined, the library will use a "sensible" default value (unless otherwise noted). Because they are compile-time constants, a library must be rebuilt if a configuration setting is changed

Functions Functions of the posix library.

The posix library consists of the following functions