6433ec22b1
Linker --wrap option resolves to __wrap_symbol for undefined symbol. During the compilation of host libportable.a, __HOST__ is defined to rename all portable functions to __wrap_symbol, and the real function to __real_symbol. This way libportable.a can be validated at host w/o changes of user's source code. See http://sourceware.org/binutils/docs/ld/Options.html Change-Id: Idcbe53dd642536f3dc2be85a875f95535b9dc0b1
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/*
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* Copyright 2012, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <portability.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <asm/unistd-portable.h>
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#include <asm/unistd.h>
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#include <fcntl_portable.h>
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#include <sys/eventfd.h>
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#include <eventfd_portable.h>
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#include <filefd_portable.h>
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#define PORTABLE_TAG "eventfd_portable"
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#include <log_portable.h>
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/* NOTE: LTP defaults to using O_NONBLOCK even if EFD_NONBLOCK is defined */
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/*
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* Portable to Native event flags mapper.
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*/
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static inline int efd_flags_pton(int portable_flags)
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{
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int native_flags = 0;
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ALOGV("%s(portable_flags:0x%x) {", __func__, portable_flags);
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if (portable_flags & EFD_NONBLOCK_PORTABLE) {
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native_flags |= EFD_NONBLOCK;
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portable_flags &= ~EFD_NONBLOCK_PORTABLE;
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}
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if (portable_flags & EFD_CLOEXEC_PORTABLE) {
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native_flags |= EFD_CLOEXEC;
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portable_flags &= EFD_CLOEXEC_PORTABLE;
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}
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if (portable_flags & EFD_SEMAPHORE_PORTABLE) {
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native_flags |= EFD_SEMAPHORE;
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portable_flags &= EFD_SEMAPHORE_PORTABLE;
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}
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if (portable_flags != 0) {
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ALOGW("%s: portable_flags:0x%x != 0; Unsupported Flags being used!",
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__func__, portable_flags);
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}
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ALOGV("%s: return(native_flags:%d); }", __func__, native_flags);
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return native_flags;
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}
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/*
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* In the original eventfd() the portable_flags were unused up to
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* linux 2.6.26 and had to be zero. Android simply uses the
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* new eventfd2 system call number, so it likely best to just use
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* the Android eventfd() for both eventfd and eventfd2 system calls.
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*/
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int WRAP(eventfd)(unsigned int initval, int portable_flags) {
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int rv;
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int native_flags;
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ALOGV(" ");
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ALOGV("%s(initval:%u, portable_flags:%d) {", __func__,
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initval, portable_flags);
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native_flags = efd_flags_pton(portable_flags);
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rv = REAL(eventfd)(initval, native_flags);
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if (rv >= 0) {
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if (native_flags & EFD_CLOEXEC) {
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filefd_CLOEXEC_enabled(rv);
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}
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filefd_opened(rv, EVENT_FD_TYPE);
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}
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ALOGV("%s: return(rv:%d); }", __func__, rv);
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return rv;
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}
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