forked from OSchip/llvm-project
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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//===- FuzzerShmem.h - shared memory interface ------------------*- C++ -* ===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// SharedMemoryRegion
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_SHMEM_H
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#define LLVM_FUZZER_SHMEM_H
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#include <algorithm>
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#include <cstring>
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#include <string>
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#include "FuzzerDefs.h"
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namespace fuzzer {
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class SharedMemoryRegion {
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public:
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bool Create(const char *Name);
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bool Open(const char *Name);
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bool Destroy(const char *Name);
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uint8_t *GetData() { return Data; }
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void PostServer() {Post(0);}
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void WaitServer() {Wait(0);}
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void PostClient() {Post(1);}
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void WaitClient() {Wait(1);}
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size_t WriteByteArray(const uint8_t *Bytes, size_t N) {
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assert(N <= kShmemSize - sizeof(N));
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memcpy(GetData(), &N, sizeof(N));
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memcpy(GetData() + sizeof(N), Bytes, N);
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assert(N == ReadByteArraySize());
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return N;
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}
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size_t ReadByteArraySize() {
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size_t Res;
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memcpy(&Res, GetData(), sizeof(Res));
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return Res;
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}
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uint8_t *GetByteArray() { return GetData() + sizeof(size_t); }
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bool IsServer() const { return Data && IAmServer; }
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bool IsClient() const { return Data && !IAmServer; }
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private:
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static const size_t kShmemSize = 1 << 22;
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bool IAmServer;
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std::string Path(const char *Name);
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std::string SemName(const char *Name, int Idx);
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void Post(int Idx);
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void Wait(int Idx);
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bool Map(int fd);
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uint8_t *Data = nullptr;
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void *Semaphore[2];
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};
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extern SharedMemoryRegion SMR;
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} // namespace fuzzer
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#endif // LLVM_FUZZER_SHMEM_H
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