mmap set offset = 4096 will fail

[EdagrHW]

std::string fileData;
size_t fileSize = sysconf(_SC_PAGESIZE) * 100 + 10;
fileData.reserve(fileSize);
for (size_t i = 0; i < fileSize; i++) {
fileData.push_back(0xff & Random::rand32());
}

File f = File::temporary();
writeStringToFileOrDie(fileData, f.fd());
std::cout << "fileSize" << fileSize << std::endl;
MemoryMapping m(File(f.fd()), 4096, 8193);

[EdagrHW]

@yfeldblum

[EdagrHW]

@yfeldblum window pageSize is 64K, but use functionsysconf(_SC_PAGESIZE) get page size is 4K, so meet error;