clearerr, feof, ferror, fileno - check and reset stream status

#include <stdio.h> I void clearerr(FILE * stream );
I int feof(FILE * stream );
I int ferror(FILE * stream );
I int fileno(FILE * stream );

The function R clearerr () clears the end-of-file and error indicators for the stream pointed to by R stream .

The function R feof () tests the end-of-file indicator for the stream pointed to by R stream , returning non-zero if it is set. The end-of-file indicator can only be cleared by the function R clearerr ().

The function R ferror () tests the error indicator for the stream pointed to by R stream , returning non-zero if it is set. The error indicator can only be reset by the R clearerr () function.

The function R fileno () examines the argument stream and returns its integer descriptor.

For non-locking counterparts, see unlocked_stdio(3).

These functions should not fail and do not set the external variable R errno . (However, in case R fileno () detects that its argument is not a valid stream, it must return -1 and set errno to R EBADF .)

The functions R clearerr (), R feof (), and R ferror () conform to C89 and C99.

open(2), fdopen(3), stdio(3), unlocked_stdio(3)