FERROR(3)

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

SYNOPSIS
#include <stdio.h>

void clearerr( FILE *stream);
int feof( FILE *stream);
int ferror( FILE *stream);
int fileno( FILE *stream);

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

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

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

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

ERRORS
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.)

CONFORMING TO
The functions clearerr, feof, and ferror conform to X3.159-1989 (``ANSI C'').

SEE ALSO
open(2), stdio(3)