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FERROR
Section: Linux Programmer's Manual (3)
Updated: 2008-08-29
Index
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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);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
fileno():
_POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
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 nonzero 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 nonzero 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 nonlocking 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 C89 and C99.
SEE ALSO
open(2),
fdopen(3),
stdio(3),
unlocked_stdio(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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