pussuw opened a new pull request, #6197:
URL: https://github.com/apache/incubator-nuttx/pull/6197

   ## Summary
   Implement atexit(), on_exit(), exit() to libc. Using the call gate versions 
is problematic as they basically inject userland code into the kernel, which is 
then run with kernel privileges. In any case the functions belong to libc.
   ## Impact
   Exit functions are executed with user privileges
   ## Testing
   mpfs icicle:knsh
   


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