clearerr, feof, ferror, fileno - check and reset stream status
The function clearerr() clears the end-of-file and error indicators for the stream pointed to by
The function fileno() examines the argument
stream and returns the integer file descriptor used to implement this stream. The file descriptor is still owned by
stream and will be closed when fclose(3) is called. Duplicate the file descriptor with dup(2) before passing it to code that might close it.
For nonlocking counterparts, see unlocked_stdio(3).
These functions should not fail and do not set the external variable
errno. (However, in case fileno() detects that its argument is not a valid stream, it must return -1 and set
errno to EBADF.)
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