fda0a14f47
If used with fopen(3)/fdopen(3)-ed FILEs, stdio accurately uses
non-cancellable internal versions of the functions, i.e. it seems to
be fine with regard to cancellation. But if the funopen(3) and
f{r,w}open(3) functions were used to open the FILE, and corresponding
user functions create cancellation points (they typically have no
other choice), then stdio code at least leaks FILE' lock.
The change installs cleanup handler which unlocks FILE. Some minimal
restructuring of the code was required to make it use common return
place to satisfy hand-rolled pthread_cleanup_pop() requirements.
Noted by: eugen
Reviewed by: eugen, vangyzen
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D11246
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/*-
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* Copyright (c) 2002-2004 Tim J. Robbins.
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* All rights reserved.
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "local.h"
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#include "mblocal.h"
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#include "xlocale_private.h"
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/*
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* MT-safe version.
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*/
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wint_t
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fgetwc_l(FILE *fp, locale_t locale)
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{
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wint_t r;
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FIX_LOCALE(locale);
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FLOCKFILE_CANCELSAFE(fp);
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ORIENT(fp, 1);
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r = __fgetwc(fp, locale);
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FUNLOCKFILE_CANCELSAFE();
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return (r);
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}
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wint_t
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fgetwc(FILE *fp)
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{
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return fgetwc_l(fp, __get_locale());
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}
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/*
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* Internal (non-MPSAFE) version of fgetwc(). This version takes an
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* mbstate_t argument specifying the initial conversion state. For
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* wide streams, this should always be fp->_mbstate. On return, *nread
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* is set to the number of bytes read.
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*/
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wint_t
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__fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale)
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{
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wchar_t wc;
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size_t nconv;
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struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
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*nread = 0;
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if (fp->_r <= 0 && __srefill(fp))
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return (WEOF);
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do {
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nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs);
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if (nconv == (size_t)-1) {
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fp->_flags |= __SERR;
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return (WEOF);
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} else if (nconv == (size_t)-2)
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continue;
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else if (nconv == 0) {
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fp->_p++;
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fp->_r--;
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(*nread)++;
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return (L'\0');
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} else {
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fp->_p += nconv;
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fp->_r -= nconv;
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*nread += nconv;
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return (wc);
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}
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} while (__srefill(fp) == 0);
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if (__sfeof(fp)) {
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fp->_flags |= __SERR;
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errno = EILSEQ;
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}
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return (WEOF);
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}
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