FERROR
Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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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
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 be cleared only 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 be reset only by the
clearerr()
function.
The function
fileno()
examines the argument
stream
and returns its integer file 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.)
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
clearerr(),
feof(),
ferror(),
fileno()
| Thread safety | MT-Safe
|
CONFORMING TO
The functions
clearerr(),
feof(),
and
ferror()
conform to C89, C99, POSIX.1-2001, and POSIX.1-2008.
The function
fileno()
conforms to POSIX.1-2001 and POSIX.1-2008.
SEE ALSO
open(2),
fdopen(3),
stdio(3),
unlocked_stdio(3)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- ATTRIBUTES
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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