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Old 05-17-2005, 10:32 AM   #1
Registered: Nov 2004
Posts: 47

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Writing Device Driver...

When "open" the device , a timer will be triggered.
"Ioctl" could read the timer present value.

I could compile this device driver module successfully,
but when doing insmod , linux cannot recognize
"setitimer" and "signal" these 2 kernel functions.
What should i do?

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/wait.h>
#include <asm/irq.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>

static int MyDevice_open(struct inode *inode, struct file *filp)
	struct timeval my_value={1,0};
	struct timeval my_interval={1,0};
	struct itimerval my_timer={my_interval,my_value};
	setitimer(ITIMER_REAL, &my_timer, 0);
	signal(SIGALRM, (sighandler_t) foo);	
Old 05-17-2005, 02:50 PM   #2
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
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Moved: This thread is more suitable in Programming and has been moved accordingly to help your thread/question get the exposure it deserves.

I'm not sure, but are you sure you can use setitimer and signal in kernel mode?
Old 05-17-2005, 09:15 PM   #3
Registered: Nov 2004
Posts: 47

Original Poster
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So is there any other way to do this?
Trigger a timer in device driver...
Old 05-18-2005, 07:41 AM   #4
Registered: Nov 2004
Posts: 72

Rep: Reputation: 15
u can use kernel_times. Read device driver By rubini and corbet. chapter no. 6 in 2nd edition.



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