56a9fda610
We haven't built any of this for years. Test: treehugger Change-Id: I3f8a85e9530af68587f47931d850eb60631a9481
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/*
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* Copyright (C) 2016 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 <sys/shm.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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void* shmat(int id, const void* address, int flags) {
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#if defined(SYS_shmat)
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return reinterpret_cast<void*>(syscall(SYS_shmat, id, address, flags));
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#else
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// See the kernel's ipc/syscall.c for the other side of this dance.
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void* result = nullptr;
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if (syscall(SYS_ipc, SHMAT, id, flags, &result, address, 0) == -1) {
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return reinterpret_cast<void*>(-1);
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}
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return result;
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#endif
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}
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int shmctl(int id, int cmd, struct shmid_ds* buf) {
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#if !defined(__LP64__)
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// Annoyingly, the kernel requires this for 32-bit but rejects it for 64-bit.
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cmd |= IPC_64;
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#endif
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#if defined(SYS_shmctl)
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return syscall(SYS_shmctl, id, cmd, buf);
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#else
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return syscall(SYS_ipc, SHMCTL, id, cmd, 0, buf, 0);
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#endif
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}
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int shmdt(const void* address) {
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#if defined(SYS_shmdt)
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return syscall(SYS_shmdt, address);
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#else
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return syscall(SYS_ipc, SHMDT, 0, 0, 0, address, 0);
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#endif
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}
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int shmget(key_t key, size_t size, int flags) {
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#if defined(SYS_shmget)
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return syscall(SYS_shmget, key, size, flags);
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#else
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return syscall(SYS_ipc, SHMGET, key, size, flags, 0, 0);
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#endif
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}
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