>-----Original Message----- >From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies- >bounce@xxxxxxxxxxxx] On Behalf Of Gaurav Dhiman >Sent: Tuesday, July 05, 2005 10:06 PM >To: Deepak Joshi >Cc: kernelnewbies@xxxxxxxxxxxx >Subject: Re: sleep process, wait queues > >On 7/3/05, Deepak Joshi <deepak_cins@xxxxxxxxxxx> wrote: >> #include <linux/module.h> >> #include <linux/kernel.h> >> #include <linux/wait.h> >> #include <linux/sched.h> >> #include <linux/list.h> >> MODULE_LICENSE("GPL"); >> >> >> static DECLARE_WAIT_QUEUE_HEAD (my_queue); >> int init_module(void) >> { >> struct task_struct *my_task ; >> my_task = find_task_by_pid(1477); >> DECLARE_WAITQUEUE(wait, my_task); >> my_task->state = TASK_UNINTERRUPTIBLE ; >> init_waitqueue_entry( &wait, my_task); >> add_wait_queue( &my_queue , &wait); >> sleep_on(&my_queue); >> interruptible_sleep_on(&my_queue); >> schedule( ); > One possible way to achieve the above task can be as follows. I used kernel linux-2.6.8 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #include <linux/module.h> #include <linux/kernel.h> #include <linux/wait.h> #include <linux/sched.h> #include <linux/list.h> static struct task_struct *my_task; static DECLARE_WAIT_QUEUE_HEAD(my_queue); wait_queue wait; static int pid=1; //pass process id to module as parameter MODULE_PARM(pid, "i"); int init_module() { my_task=find_task_by_pid(pid); DECLARE_WAITQUEUE(wait1, my_task); wait=wait1; my_task->state = TASK_INTERRUPTIBLE; init_waitqueue_entry(&wait, my_task); add_wait_queue(&my_queue, &wait); return 0; } void cleanup_module() { printk("exiting\n"); wake_up_interruptible(&my_queue); my_task->state = TASK_RUNNING; remove_wait_queue(&my_queue, &wait); } MODULE_LICENSE("GPL"); ======================== It worked for me perfectly. Kindly let me know if I am missing something. Sanjay. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://sanjayku.blogspot.com >Its not the right way to put another process to sleep, because all the >sleep functions put the current running process to sleep and in your >case the current is insmod itself. You should rather hack control flow >of any of the common system calls, like open(). Once you hack that >(you can do that in init_module() function), in your hack function >check if the current process is the process you want to put to sleep, >if yes, do the above sleeping mechanism in your hack function. > >regards, >-Gaurav > >> return 0; >> } >> >> >> void cleanuo_module() >> { >> printk("Bye"); >> wake_up( &my_queue ); >> } >> >> >> >> >> Hi everyone, >> >> In the above module I want to sleep the process having >> pid 1477 ( which is mpg123 player in my case in wait >> queue ). Instead of sleeping the process with the >> given pid it is hanging insmod command. so plz tell me >> what is wrong in the above code. >> >> Thanks for replays in Advance, >> Thanks and regards >> Deepak Joshi. >> >> >> >> >> ___________________________________________________________ >> How much free photo storage do you get? Store your holiday >> snaps for FREE with Yahoo! Photos http://uk.photos.yahoo.com >> >> -- >> Kernelnewbies: Help each other learn about the Linux kernel. >> Archive: http://mail.nl.linux.org/kernelnewbies/ >> FAQ: http://kernelnewbies.org/faq/ >> >> > >-- >Kernelnewbies: Help each other learn about the Linux kernel. >Archive: http://mail.nl.linux.org/kernelnewbies/ >FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
