ferror
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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);
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fileno():
_POSIX_C_SOURCE || _XOPEN_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 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 C89 and C99.

SEE ALSO

open(2), fdopen(3), stdio(3), unlocked_stdio(3)

COLOPHON

This page is part of release 2.79 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/.

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