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 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 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

  Multithreading (see pthreads(7))
The clearerr(), feof(), ferror(), and fileno() functions are thread-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 3.65 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/.