How to print the process number using the interface provided by kernel

This article is about how to use the interface provided by kernel to print process numbers. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

C file printPid.c

The code is as follows:

# include

# include

# include

# include

# include

Static _ _ init int printPid (void) / / install module function

{

Struct task_struct * task,*p

Struct list_head * ps

Int count=0

Printk ("begin.\ n")

Task=&init_task

List_for_each (ps,&task- > tasks)

{

P=list_entry (ps,struct task_struct,tasks)

Count++

Printk ("% d\ t% s\ n", p-> pid,p- > comm)

}

Printk ("Process counts:%d\ n", count)

Return 0

}

Static _ _ exit void exitPid (void) / / uninstall the function

{

Printk ("exit!\ n")

}

Module_init (printPid); / / the implemented function must be put into it

Module_exit (exitPid)

The pid.ko file is generated after make.

Then use these commands:

The code is as follows:

# installation module

Sudo insmod pid

# display log information

Dmesg

# display all mounted modules

Lsmod

# Uninstall

Sudo rmmod pid

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