To summarize, the kernel first translates the destination userspace virtual address to its backing physical frame via a software page table walk. Then it maps this frame into its own virtual address space as RW. Finally, it performs the writes using a simple memcpy.
result = bytes(dev.read(0x82, 64))。关于这个话题，新收录的资料提供了深入分析
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第三十八条 纳税人发生应税交易，开具增值税专用发票后，发生开票有误或者销售折让、中止、退回等情形的，应当按照国务院税务主管部门的规定进行作废处理或者开具红字增值税专用发票；未按规定进行作废处理或者开具红字增值税专用发票的，不得依照本条例第十三条和第十四条的规定扣减销项税额或者销售额。
Note: Returning a nonzero exit code from main signals failure to the host. The return 1; in the error branch lets the host know the script didn’t complete successfully.。关于这个话题，新收录的资料提供了深入分析