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FERROR(3) Library Functions Manual FERROR(3)

NAME

clearerr, feof, ferror, filenocheck 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 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 file descriptor.

ERRORS

These functions should not fail and do not set the external variable errno.

SEE ALSO

open(2), stdio(3)

STANDARDS

The functions clearerr(), feof(), and ferror() conform to ANSI X3.159-1989 (“ANSI C89”). The function fileno() conforms to IEEE Std 1003.1-1990 (“POSIX.1”).

HISTORY

The functions clearerr(), feof(), ferror(), and fileno() first appeared in Version 7 AT&T UNIX.
July 17, 2013 OpenBSD-6.1