Method readChunkDirect

src/pystack/_pystack/mem.cpp:238–269

}

ssize_t
ProcessMemoryManager::readChunkDirect(remote_addr_t addr, size_t len, char* dst) const
{
    struct iovec local[1];
    struct iovec remote[1];
    ssize_t result = 0;
    ssize_t read = 0;

    do {
        local[0].iov_base = dst + result;
        local[0].iov_len = len - result;
        remote[0].iov_base = reinterpret_cast<uint8_t*>(addr) + result;
        remote[0].iov_len = len - result;

        read = _process_vm_readv(d_pid, local, 1, remote, 1, 0);
        if (read < 0) {
            if (errno == EFAULT) {
                throw InvalidRemoteAddress();
            } else if (errno == EPERM) {
                throw std::runtime_error(PERM_MESSAGE);
            } else if (errno == ENOSYS) {
                LOG(DEBUG) << "process_vm_readv not compiled in kernel, falling back to /proc/PID/mem";
                return readChunkThroughMemFile(addr, len, dst);
            }
            throw std::system_error(errno, std::generic_category());
        }

        result += read;
    } while ((size_t)read != local[0].iov_len);

    return result;
}

ssize_t
ProcessMemoryManager::readChunkThroughMemFile(remote_addr_t addr, size_t len, char* dst) const