mirror of https://github.com/mkerrisk/man-pages
117 lines
3.7 KiB
Groff
117 lines
3.7 KiB
Groff
.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)ferror.3 6.8 (Berkeley) 6/29/91
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.\"
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.\"
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.\" Converted for Linux, Mon Nov 29 14:24:40 1993, faith@cs.unc.edu
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.\" Added remark on EBADF for fileno, aeb, 2001-03-22
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.\"
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.TH FERROR 3 2007-07-26 "" "Linux Programmer's Manual"
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.SH NAME
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clearerr, feof, ferror, fileno \- check and reset stream status
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.SH SYNOPSIS
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.B #include <stdio.h>
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.sp
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.BI "void clearerr(FILE *" stream );
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.BI "int feof(FILE *" stream );
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.BI "int ferror(FILE *" stream );
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.BI "int fileno(FILE *" stream );
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR fileno ():
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_POSIX_C_SOURCE || _XOPEN_SOURCE
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.SH DESCRIPTION
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The function
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.BR clearerr ()
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clears the end-of-file and error indicators for the stream pointed to by
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.IR stream .
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.PP
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The function
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.BR feof ()
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tests the end-of-file indicator for the stream pointed to by
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.IR stream ,
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returning non-zero if it is set.
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The end-of-file indicator can only be
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cleared by the function
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.BR clearerr ().
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.PP
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The function
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.BR ferror ()
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tests the error indicator for the stream pointed to by
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.IR stream ,
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returning non-zero if it is set.
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The error indicator can only be reset by the
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.BR clearerr ()
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function.
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.PP
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The function
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.BR fileno ()
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examines the argument
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.I stream
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and returns its integer descriptor.
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.PP
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For non-locking counterparts, see
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.BR unlocked_stdio (3).
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.SH ERRORS
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These functions should not fail and do not set the external variable
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.IR errno .
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(However, in case
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.BR fileno ()
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detects that its argument is not a valid stream, it must
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return \-1 and set
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.I errno
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to
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.BR EBADF .)
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.SH "CONFORMING TO"
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The functions
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.BR clearerr (),
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.BR feof (),
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and
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.BR ferror ()
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conform to C89 and C99.
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.SH "SEE ALSO"
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.BR open (2),
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.BR fdopen (3),
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.BR stdio (3),
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.BR unlocked_stdio (3)
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