linux kernel - Make a system call to get list of processes -

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i'm new on modules programming , need make system call retrieve system processes , show how cpu consuming.

how can make call?

why implement system call this? don't want add syscall existing linux api. primary linux interface userspace , nobody touches syscalls except top kernel developers know do.

if want list of processes , parameters , real-time statuses, use /proc. every directory that's integer in there existing process id , contains bunch of useful dynamic files ps, top , others use print output.

if want list of processes within kernel (e.g. within module), should know processes kept internally doubly linked list starts init process (symbol init_task in kernel). should use macros defined in include/linux/sched.h processes. here's example:

#include <linux/module.h> #include <linux/printk.h> #include <linux/sched.h>  static int __init ex_init(void) {     struct task_struct *task;      for_each_process(task)         pr_info("%s [%d]\n", task->comm, task->pid);      return 0; }  static void __exit ex_fini(void) { }  module_init(ex_init); module_exit(ex_fini);

this should okay gather information. however, don't change in there unless know you're doing (which require bit more reading).


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