ferror(3) -- Linux man page
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.
For non-locking counterparts, see
unlocked_stdio(3).
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),
unlocked_stdio(3),
stdio(3)
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