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 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
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.