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bug: 运行ls命令，串口输出会显示两次结果 #45

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fslongjin opened this issue Sep 28, 2024 · 1 comment
Open

bug: 运行ls命令，串口输出会显示两次结果 #45

fslongjin opened this issue Sep 28, 2024 · 1 comment
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@fslongjin
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有问题的版本： cac674d

经验证，问题从 5b85994 之后出现了。

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@fslongjin fslongjin added the bug Something isn't working label Sep 28, 2024
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MemoryShore commented Sep 28, 2024 •
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调试过程

经过调试发现，如果在创建子进程前关闭了raw模式，就会出现ls命令重复输出的现象，因为 5b85994 版本修复了exec前未关闭raw模式的bug，所以 5b85994 之后的版本才会出现这个问题

注释掉关闭raw模式的代码，串口输出正常：
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原因推测

为排除NovaShell的影响，直接修改init程序为ls，并在write系统调用中打印日志：
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输出结果：
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可以发现只进行了一次write系统调用，可以排除应用程序的问题，推测是串口或者tty的问题
@fslongjin

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@fslongjin @MemoryShore