Hi, >-----Original Message----- >From: raja [mailto:vnagaraju@xxxxxxxxxxxx] >Sent: Tuesday, September 20, 2005 5:26 PM >To: kernel; fawadlateef@xxxxxxxxx >Subject: Re: interrupts > >actually i am writing a module to sense the timer interrupt. >Any way for every clock tick the timer updates the system time.I want to >find out the process's information that was running at the time the >timer interrupt occures. >I have registered my handler that prints simply a message when ever the >timer interrupt occures.But it is not working.It is not printing any >message. I couldn't get the usage of char device in your code. See if this sample code helps you. Here I have: ~~~~~~~~~~~ struct timer_list tick_timer; void timer_func(unsigned int data) { /* Do all the processing here Print pid of the currently running task. */ mod_timer(&tick_timer, jiffies + 1); } static int __init start_timer(void) { init_timer(&tick_timer); tick_timer.expires = jiffies + 1; tick_timer.function=timer_func; add_timer(&tick_timer); return 0; } Static void __exit exit_timer(void) { del_timer(&my_timer); } module_init(start_timer); module_exit(exit_timer); ~~~~~~~~~~~~~~~~~~~~~~~~ Sanjay > >I am listing my code below.Will you please help me > > > > > > > > > >#ifndef __KERNEL__ > #define __KERNEL__ >#endif > >#ifndef MODULE > #define MODULE >#endif > >#include <linux/kernel.h> >#include <linux/init.h> >#include <linux/module.h> >#include <linux/fs.h> >#include <linux/interrupt.h> > >MODULE_AUTHOR("RAJA"); >MODULE_DESCRIPTION("TIMER INTERRUPT"); >MODULE_LICENSE("GPL"); > >#define DEVICE_NAME "timer_interrupt" >#define TIMER_INTERRUPT 0 >static int __init init_timer_interrupt(void); >static void __exit exit_timer_interrupt(void); > >static irqreturn_t timer_interrupt_handler(unsigned int,void *, struct >pt_regs *); > >int devNo; >struct file_operations fops = {}; > >static irqreturn_t timer_interrupt_handler(unsigned int irq,void *data, >struct pt_regs *regs) >{ > printk("Timer Interrupt Occured\n"); > return 0; >} > >static int __init init_timer_interrupt() >{ > printk("Entered Into init_timer\n"); > devNo = register_chrdev(0,DEVICE_NAME,&fops); > >request_irq(TIMER_INTERRUPT,timer_interrupt_handler,SA_SHIRQ,DEVICE_NAM E,&d >evNo); > printk("Exited From init_timer\n"); > return 0; >} > >static void __exit exit_timer_interrupt() >{ > printk("Entered Into exit_timer\n"); > unregister_chrdev(devNo,DEVICE_NAME); > free_irq(TIMER_INTERRUPT,&devNo); > printk("Exited From exit_timer\n"); >} > >module_init(init_timer_interrupt); >module_exit(exit_timer_interrupt); > > > > > > > > > > > > > > >On Tue, 2005-09-20 at 17:02 +0500, Fawad Lateef wrote: >> On 9/20/05, raja <vnagaraju@xxxxxxxxxxxx> wrote: >> > yaa. >> > I have checked /proc/interrupts. >> > But there it is given the interrupt numbers. >> > >> > actually the requirement is i am writing a module that it senses when >> > ever the interrupt occures and prints the interrupt number. >> > >> > Will you please help me. >> > >> > >> >> What sort of module you are writing ?? How you are going to sense >> interrupts when they occurs ?? I think for getting signal through the >> call-backed function from the kernel you have to register your >> interrupt handlers, so that you can be notified by the kernel ........ >> >> Or hack into the kernel, to get notified for each interrupt, but AFAIK >> your module can't get every single interrupt until you register them >> with the kernel ........ >> >> Correct me if I m wrong !!!! >> >> > > >-- >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/
