RTEMS POSIX API User's Guide
POSIX allows for variables in the run-time environment. These are name/value pairs that make be dynamically set and obtained by programs. In a full POSIX environment with command line shell and multiple processes, environment variables may be set in one process -- such as the shell -- and inherited by child processes. In RTEMS, there is only one process and thus only one set of environment variables across all processes.
RTEMS POSIX API User's Guide
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