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 its integer file descriptor.
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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