[GitHub] [incubator-nuttx-apps] juniskane edited a comment on pull request #425: Remove all fclose with stdin, stdout and stderr

[GitBox <gi...@apache.org>]

juniskane edited a comment on pull request #425:
URL: https://github.com/apache/incubator-nuttx-apps/pull/425#issuecomment-708432008


   This fixes the USB console for me, but note that this is still a workaround. The following strictly conforming C program causes a crash on NuttX (tested in Flat mode build):
   ```
   #include <stdio.h>
   
   int main(void)
   {
       /* Note: order significant if want to see a crash on NuttX. */
       fclose(stdin);
       fclose(stdout);
       fclose(stderr);
       /* ... can open some file here, read/write to it, close it. ... just don't call printf() */
       return 0;
   }
   ```
   
   This kind of usage of fclose() is unlikely to appear in real programs, though.
   
   Also note that fflush(stdin) is undefined behavior in C, but we can allow it since we are the implementor.


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