mirror of https://github.com/mkerrisk/man-pages
135 lines
4.0 KiB
Groff
135 lines
4.0 KiB
Groff
.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" and Copyright (C) 2021 Michael Kerrisk <mtk.manpages@gmail.com>
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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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.\" %%%LICENSE_START(BSD_4_CLAUSE_UCB)
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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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.\" %%%LICENSE_END
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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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.\"
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.TH FERROR 3 2021-03-22 "" "Linux Programmer's Manual"
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.SH NAME
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clearerr, feof, ferror \- check and reset stream status
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.SH SYNOPSIS
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.nf
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.B #include <stdio.h>
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.PP
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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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.fi
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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 nonzero if it is set.
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The end-of-file indicator can be cleared only 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 nonzero if it is set.
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The error indicator can be reset only by the
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.BR clearerr ()
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function.
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.PP
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For nonlocking counterparts, see
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.BR unlocked_stdio (3).
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.SH RETURN VALUE
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The
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.BR feof ()
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function returns nonzero if the end-of-file indicator is set for
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.IR stream ;
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otherwise, it returns zero.
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.PP
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The
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.BR ferror ()
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function returns nonzero if the error indicator is set for
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.IR stream ;
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otherwise, it returns zero.
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.SH ERRORS
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These functions should not fail and do not set
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.IR errno .
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR clearerr (),
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.BR feof (),
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.BR ferror ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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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, C99, POSIX.1-2001, and POSIX.1-2008.
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.SH NOTES
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POSIX.1-2008 specifies
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.\"https://www.austingroupbugs.net/view.php?id=401
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that these functions shall not change the value of
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.I errno
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if
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.I stream
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is valid.
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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 fileno (3),
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.BR stdio (3),
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.BR unlocked_stdio (3)
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