FERROR(3) Linux Programmer's Manual FERROR(3)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 ALSOopen(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/.
2008-08-29 FERROR(3)
