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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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