Home/ Questions/What is ''how to find task_struct by pid without iterating through the task_struct list''?
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Margot Roberts
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Asked: 2022-05-18T19:14:36+00:00 In:

What is ”how to find task_struct by pid without iterating through the task_struct list”?

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I’m learning about “How to find task_struct by pid without iterating through the task_struct list”, honestly I don’t know anything about it. Please give me some knowledge about it.

linux
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  1. Best Answer
    Expert

    The best solution for ”how to find task_struct by pid without iterating through the task_struct list” is doing one of the following commands:

    extern struct task_struct *find_task_by_vpid(pid_t nr);
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
struct pid_namespace *ns);

    Another way is using the below command in a module:

    pid_task(find_vpid(pid), PIDTYPE_PID);
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  2. You can find task_struct in a module by using find_task_by_vpid(pid_t nr), etc. These functions cannot be exported so they won’t work.

    You can substitute the following function in a module: 

    pid_task(find_vpid(pid), PIDTYPE_PID);
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