87 lines
2.5 KiB
C
87 lines
2.5 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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* advertising materials, and 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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<<ferror>>, <<ferror_unlocked>>---test whether read/write error has occurred
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INDEX
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ferror
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INDEX
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ferror_unlocked
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SYNOPSIS
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#include <stdio.h>
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int ferror(FILE *<[fp]>);
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#define _BSD_SOURCE
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#include <stdio.h>
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int ferror_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.
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Use <<ferror>> to query this indicator.
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See <<clearerr>> to reset the error indicator.
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<<ferror_unlocked>> is a non-thread-safe version of <<ferror>>.
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<<ferror_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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<<ferror_unlocked>> is equivalent to <<ferror>>.
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RETURNS
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<<ferror>> returns <<0>> if no errors have occurred; it returns a
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nonzero value otherwise.
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PORTABILITY
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ANSI C requires <<ferror>>.
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<<ferror_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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Berkeley) %G%";
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#endif /* LIBC_SCCS and not lint */
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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 ferror. */
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#undef ferror
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int
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_DEFUN(ferror, (fp),
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FILE * fp)
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{
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int result;
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CHECK_INIT(_REENT, fp);
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_newlib_flockfile_start (fp);
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result = __sferror (fp);
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_newlib_flockfile_end (fp);
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return result;
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}
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