mirror of
https://github.com/gatieme/LDD-LinuxDeviceDrivers.git
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108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*************************************************************************
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> File Name: process.c
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> Author: GatieMe
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> Mail: gatieme@163.com
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> Created Time: 2016年04月01日 星期五 21时09分29秒
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************************************************************************/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/sched.h>
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/*
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* you can use METHOD to select the function you want to list the process
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* METHOD = 1 "list_for_each"
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* METHOD = 2 "for_each_process"
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* METHOD = 3 "list_for_each_entry"
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*/
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static unsigned int METHOD = 1;
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module_param(METHOD, uint, 0400);
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void do_list_process(void)
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{
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struct task_struct *task = NULL, *pTask = NULL;
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struct list_head *pos = 0;
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int count = 0;
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char *method = NULL;
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count = 0;
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task = &init_task;
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printk(KERN_ALERT"PID\tCOMM\n");
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switch(METHOD)
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{
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case 1 :
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method = "list_for_each";
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list_for_each(pos, &task->tasks)
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{
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pTask = list_entry(pos, struct task_struct, tasks);
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count++;
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printk(KERN_ALERT "%d\t%s\n", pTask->pid, pTask->comm);
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}
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// because the list of process is an double-linked circular list
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// we can also list all the process from the current process
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/*
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list_for_each(pos, ¤t->children)
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{
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pTask = list_entry(pos, struct task_struct, sibling);
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printk(KERN_ALERT "%d\t%s\n", pTask->pid, pTask->comm);
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}
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*/
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break;
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case 2 :
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method = "for_each_process";
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for_each_process(pTask)
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{
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count++;
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printk(KERN_ALERT "%d\t%s\n", pTask->pid, pTask->comm);
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}
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break;
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case 3 :
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method = "list_for_each_entry";
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list_for_each_entry(pTask, &task->tasks, tasks)
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{
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count++;
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printk(KERN_ALERT "%d\t%s\n", pTask->pid, pTask->comm);
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}
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break;
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}
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printk(KERN_ALERT "The method is %s\n", method);
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printk(KERN_ALERT "there are %d process in your system now...\n", count);
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printk(KERN_ALERT "current : %d\t%s\n", current->pid, current->comm);
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return 0;
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}
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static int init_list_process(void)
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{
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// list all the process of you system
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do_list_process( );
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}
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static void exit_list_process(void)
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{
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printk(KERN_ALERT "GOOD BYE--list process!!\n");
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}
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module_init(init_list_process);
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module_exit(exit_list_process);
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MODULE_AUTHOR("gatieme");
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MODULE_LICENSE("GPL");
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