thank you. But The same procedure i followed for key board interrupt. When ever a key is pressed on the key board it will print the message. But why it will not wor for timer interrupt? thanks in advance On Tue, 2005-09-20 at 22:10 +0530, Manu Anand wrote: > > > On 9/20/05, raja <vnagaraju@xxxxxxxxxxxx> wrote: > 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. > > > Hi Raja: > > Am I write in assuming that u want ur module to sort of hook on to > timer interrupt? The idea being that ur module should also be invoked > when the timer interrupt handler is invoked. > > In that case, the approach you've followed will not work. Timer > interrupt is not shared. > > When the kernel receives the interrupt, it invokes sequentially each > reqistered handler on the line. However in your case the call > > request_irq(TIMER_INTERRUPT, > timer_interrupt_handler,SA_SHIRQ,DEVICE_NAME,&devNo); > > will fail since the IRQ line is already registered for timer interrupt > in an exclusive non-shared( specified using SA_INTERRUPT > // Check out http://lxr.linux.no/source/arch/i386/mach-default/setup.c#L74 > static struct > irqaction irq0 = > { timer_interrupt, SA_INTERRUPT, > CPU_MASK_NONE, "timer", NULL, NULL}; > > Your approach is valid for interrupts specified with SA_SHIRQ flag. > > > Manu > > > > 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 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_NAME,&devNo); > 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/
