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