Method mapFilePath

app/src/main/cpp/utils/FileMemMap.cpp:21–52

}

int FileMemMap::mapFilePath(const char* path, bool readOnly, size_t length) {
    int fd = open(path, O_RDONLY);
    if (fd < 0) {
        return errno;
    }
    if (length == 0) {
        struct stat64 fileInfo = {};
        if (fstat64(fd, &fileInfo) < 0) {
            int err = errno;
            close(fd);
            return err;
        }
        length = size_t(fileInfo.st_size);
    }
    if (length == 0) {
        close(fd);
        return EINVAL;
    }
    size_t kPageSize = utils::GetPageSize();
    size_t pageAlignedSize = (length + kPageSize - 1u) & ~(kPageSize - 1u);
    void* addr = mmap(nullptr, pageAlignedSize, readOnly ? PROT_READ : (PROT_READ | PROT_WRITE), MAP_PRIVATE, fd, 0);
    if (addr == MAP_FAILED) {
        int err = errno;
        close(fd);
        return err;
    }
    close(fd);
    mAddress = addr;
    mLength = length;
    mMapLength = pageAlignedSize;
    return 0;
}

int FileMemMap::mapFileDescriptor(int fd, bool readOnly, size_t length, bool shared) {
    if (fd < 0) {