mirror of
https://github.com/gatieme/LDD-LinuxDeviceDrivers.git
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105 lines
2.0 KiB
C
105 lines
2.0 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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//#define METHOD 2
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static unsigned int METHOD = 1;
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module_param(METHOD, uint,0400);
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static int list_process_init(void)
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{
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struct task_struct *task, *p;
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struct list_head *pos;
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int count;
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char *method;
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count = 0; /*下面这些初始化完全是为了消除编译时的警告信息*/
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p = 0;
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task = 0;
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pos = 0;
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method = 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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break;
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case 2:
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method = "for_each_process";
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break;
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case 3:
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method = "list_for_each_entry";
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break;
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}
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printk( "The method is %s\n", method );
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switch(METHOD)
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{
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case 1 :
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list_for_each( pos, &task->tasks )
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{
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p = list_entry( pos, struct task_struct, tasks );
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count++;
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printk( KERN_ALERT "%d\t%s\n", p->pid, p->comm );
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}
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break;
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case 2 :
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for_each_process(task)
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{
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count++;
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printk( KERN_ALERT "%d\t%s\n", task->pid, task->comm );
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}
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break;
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case 3 :
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list_for_each_entry( p, &task->tasks, tasks )
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{
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count++;
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printk( KERN_ALERT "%d\t%s\n", p->pid, p->comm );
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}
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}
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printk("there are %d process in your system now...", count);
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return 0;
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}
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static void list_process_exit(void)
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{
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printk( KERN_ALERT "GOOD BYE!!\n");
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}
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module_init(list_process_init);
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module_exit(list_process_exit);
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MODULE_AUTHOR("gatieme");
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MODULE_LICENSE("GPL");
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