8c4994bbc1
The old __isthreaded hack was never very useful on Android because all user code runs in a VM where there are lots of threads running. But __fsetlocking lets a caller say "I'll worry about the locking for this FILE*", which is useful for the normal case where you don't share a FILE* between threads so you don't need any locking. Bug: 17154740 Bug: 18593728 Change-Id: I2a8dddc29d3edff39a3d7d793387f2253608a68d
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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 <stdio_ext.h>
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#include <stdlib.h>
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#include "local.h"
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#include "private/libc_logging.h"
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size_t __fbufsize(FILE* fp) {
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return fp->_bf._size;
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}
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/* For a _SRW stream, we don't know whether we last read or wrote.
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int __freading(FILE* fp) {
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return (fp->_flags & _SRD) != 0 || ...;
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}
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*/
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/* For a _SRW stream, we don't know whether we last read or wrote.
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int __fwriting(FILE*) {
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return (fp->_flags & _SWR) != 0 || ...;
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}
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*/
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int __freadable(FILE* fp) {
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return (fp->_flags & (__SRD|__SRW)) != 0;
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}
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int __fwritable(FILE* fp) {
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return (fp->_flags & (__SWR|__SRW)) != 0;
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}
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int __flbf(FILE* fp) {
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return (fp->_flags & __SLBF) != 0;
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}
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void __fpurge(FILE* fp) {
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fpurge(fp);
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}
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size_t __fpending(FILE* fp) {
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return fp->_p - fp->_bf._base;
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}
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void _flushlbf() {
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// If we flush all streams, we know we've flushed all the line-buffered streams.
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fflush(NULL);
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}
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int __fsetlocking(FILE* fp, int type) {
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int old_state = _EXT(fp)->_stdio_handles_locking ? FSETLOCKING_INTERNAL : FSETLOCKING_BYCALLER;
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if (type == FSETLOCKING_QUERY) {
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return old_state;
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}
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if (type != FSETLOCKING_INTERNAL && type != FSETLOCKING_BYCALLER) {
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// The API doesn't let us report an error, so blow up.
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__libc_fatal("Bad type (%d) passed to __fsetlocking", type);
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}
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_EXT(fp)->_stdio_handles_locking = (type == FSETLOCKING_INTERNAL);
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return old_state;
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}
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void clearerr_unlocked(FILE* fp) {
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return __sclearerr(fp);
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}
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int feof_unlocked(FILE* fp) {
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return __sfeof(fp);
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}
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int ferror_unlocked(FILE* fp) {
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return __sferror(fp);
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}
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