mirror of
https://github.com/gatieme/LDD-LinuxDeviceDrivers.git
synced 2026-08-21 22:43:03 +08:00
112 lines
1.6 KiB
C
112 lines
1.6 KiB
C
#include <linux /list.h>
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#include <linux /module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#define METHOD 2
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static int list_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 = NULL;
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task = NULL;
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pos = NULL;
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method = NULL;
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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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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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#if METHOD == 1
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list_for_each( pos, &task->tasks ) {
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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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#elif METHOD == 2
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for_each_process(task) {
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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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#elif METHOD == 3
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list_for_each_entry( p, &task->tasks, 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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#endif
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printk("系统当前共 %d 个进程!!", count);
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return 0;
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}
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static void list_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_init );
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module_exit( list_exit );
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MODULE_AUTHOR( "Along" );
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MODULE_LICENSE( "GPL" );
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