forked from KolibriOS/kolibrios
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
/*
|
|
FUNCTION
|
|
<<clearerr>>, <<clearerr_unlocked>>---clear file or stream error indicator
|
|
|
|
INDEX
|
|
clearerr
|
|
INDEX
|
|
clearerr_unlocked
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <stdio.h>
|
|
void clearerr(FILE *<[fp]>);
|
|
|
|
#define _BSD_SOURCE
|
|
#include <stdio.h>
|
|
void clearerr_unlocked(FILE *<[fp]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <stdio.h>
|
|
void clearerr(<[fp]>)
|
|
FILE *<[fp]>;
|
|
|
|
#define _BSD_SOURCE
|
|
#include <stdio.h>
|
|
void clearerr_unlocked(<[fp]>)
|
|
FILE *<[fp]>;
|
|
|
|
DESCRIPTION
|
|
The <<stdio>> functions maintain an error indicator with each file
|
|
pointer <[fp]>, to record whether any read or write errors have
|
|
occurred on the associated file or stream. Similarly, it maintains an
|
|
end-of-file indicator to record whether there is no more data in the
|
|
file.
|
|
|
|
Use <<clearerr>> to reset both of these indicators.
|
|
|
|
See <<ferror>> and <<feof>> to query the two indicators.
|
|
|
|
<<clearerr_unlocked>> is a non-thread-safe version of <<clearerr>>.
|
|
<<clearerr_unlocked>> may only safely be used within a scope
|
|
protected by flockfile() (or ftrylockfile()) and funlockfile(). This
|
|
function may safely be used in a multi-threaded program if and only
|
|
if they are called while the invoking thread owns the (FILE *)
|
|
object, as is the case after a successful call to the flockfile() or
|
|
ftrylockfile() functions. If threads are disabled, then
|
|
<<clearerr_unlocked>> is equivalent to <<clearerr>>.
|
|
|
|
RETURNS
|
|
<<clearerr>> does not return a result.
|
|
|
|
PORTABILITY
|
|
ANSI C requires <<clearerr>>.
|
|
|
|
<<clearerr_unlocked>> is a BSD extension also provided by GNU libc.
|
|
|
|
No supporting OS subroutines are required.
|
|
*/
|
|
|
|
#include <_ansi.h>
|
|
#include <stdio.h>
|
|
#include "local.h"
|
|
|
|
/* A subroutine version of the macro clearerr. */
|
|
|
|
#undef clearerr
|
|
|
|
_VOID
|
|
_DEFUN(clearerr, (fp),
|
|
FILE * fp)
|
|
{
|
|
CHECK_INIT(_REENT, fp);
|
|
_newlib_flockfile_start (fp);
|
|
__sclearerr (fp);
|
|
_newlib_flockfile_end (fp);
|
|
}
|