Module Initialization and Exit

simple_init Function

• Creates the proc file.
• Initializes the module.

simple_exit Function

• Removes the proc file.
• Cleans up the module.

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Proc File Operations

proc_read Function

• Reads the proc file and returns process information in the format: <PID_COMM> -> <CHILD_PID_CHILD_COMM>

yaml Copy code

proc_write Function

• Writes to the proc file and logs the written data.

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Task Information

append_task_info Function

• Recursively appends task information to the buffer, including child processes.

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Error Handling

Memory Allocation

• Checks for successful memory allocation and handles errors by returning -ENOMEM.

File Operations

• Checks for successful file operations and handles errors by returning -EFAULT.

Process Lookup

• Checks for successful process lookup and handles errors by returning -ESRCH.

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I/O Redirection, Piping, and Command Execution

I/O Redirection

• Handles input and output redirection by opening the specified files and setting the appropriate file descriptors.

Piping

• Sets up pipes for command chaining and redirects input and output through the pipes.

Command Execution

• Uses execv to execute external commands, passing command arguments and environment variables.

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Auto-Completion with Tab

Tab Key Handling

• Searches for matching commands or files when the Tab key is pressed and provides suggestions.

Command and File Search

• Searches for commands in the PATH environment variable and files in the current directory.

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Built-in Commands

kuhex Command

• Displays the contents of a file in hexadecimal format, with optional grouping.

psvis Command

• Generates a process tree visualization using the dot tool from Graphviz, loading the kernel module if