使用深度优先树遍历所有任务的内核模块 [英] Kernel module that iterates over all tasks using depth first tree
问题描述
因此,我知道如何创建内核并通过简单地包含linux/sched.h
并使用以下代码来线性地迭代进程:
So I know how to create a kernel and to iterate over the processes linearly by Simply including linux/sched.h
and using the following code:
struct task_struct *task;
for_each_process(task)
{
printk("Name: %s PID: [%d]\n", task->comm, task->pid);
}
如何使用深度优先搜索打印这些任务?我希望我的输出类似于ps -eLf
的输出.
How can I print these tasks using a depth first search? I want my output to be similar to the one of ps -eLf
.
已提供以下代码补丁供参考:
The following patch of code has been given for reference:
struct task_struct *task;
struct list_head *list;
list_for_each(list, &init_task->children) {
task = list_entry(list, struct task_struct, sibling);
/* task points to the next child in the list */
}
,我知道task->comm
返回该任务的名称,而task->pid
返回该任务的PID.
and I know that task->comm
returns the name and task->pid
returns the PID for that task.
使用哪些命令返回状态和父pid?
What commands are used to return the state and parent pid?
推荐答案
这有点旧,但是我碰到了它,因为它似乎是操作系统概念第9版,因此可能还会有其他人来找.
This is a bit old, but I came across it as it seems to be one of the programming projects found in chapter 3 of Operating System Concepts 9th Edition, so others may yet come looking.
开始时使用的代码直接来自本书,但这是一个很好的起点.您只需要实现DFS.这是将完成此操作的代码,它应该很容易解释:
The code you started with is straight from the book, but it is a good starting point. You just need to implement the DFS. Here is the code that will accomplish it, it should be pretty self explanatory:
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
/**
* Performs a DFS on a given task's children.
*
* @void
*/
void DFS(struct task_struct *task)
{
struct task_struct *child;
struct list_head *list;
printk("name: %s, pid: [%d], state: %li\n", task->comm, task->pid, task->state);
list_for_each(list, &task->children) {
child = list_entry(list, struct task_struct, sibling);
DFS(child);
}
}
/**
* This function is called when the module is loaded.
*
* @return 0 upon success
*/
int task_lister_init(void)
{
printk(KERN_INFO "Loading Task Lister Module...\n");
DFS(&init_task);
return 0;
}
/**
* This function is called when the module is removed.
*
* @void
*/
void task_lister_exit(void)
{
printk(KERN_INFO "Removing Task Lister Module...\n");
}
// Macros for registering module entry and exit points.
module_init(task_lister_init);
module_exit(task_lister_exit);
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