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