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Revise the depiction of return type of proc_create().

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heartofrain 2023-10-07 16:50:23 +08:00
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commit a8558121d9
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lkmpg.tex
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@ -1145,7 +1145,7 @@ This is the HelloWorld for the \verb|/proc| filesystem.
There are three parts: create the file \verb|/proc/helloworld| in the function \cpp|init_module|, return a value (and a buffer) when the file \verb|/proc/helloworld| is read in the callback function \cpp|procfile_read|, and delete the file \verb|/proc/helloworld| in the function \cpp|cleanup_module|.
The \verb|/proc/helloworld| is created when the module is loaded with the function \cpp|proc_create|.
The return value is a \cpp|struct proc_dir_entry|, and it will be used to configure the file \verb|/proc/helloworld| (for example, the owner of this file).
The return value is a pointer to \cpp|struct proc_dir_entry|, and it will be used to configure the file \verb|/proc/helloworld| (for example, the owner of this file).
A null return value means that the creation has failed.
Every time the file \verb|/proc/helloworld| is read, the function \cpp|procfile_read| is called.