Hi!
I'd like to notify a user space application if an interrupt occurs. I had no
problems to install a custom signal handler but I am not sure what's the best
way to notify the application.
My first idea was to send a signal to the application. But as far as I know
one has to know the pid to send the signal. So I'd need some mechanism to get
this pid - perhaps via a /proc entry. Is this a clean solution?
Another idea was to create a (blocking) character device and have the
application listening on that using select() or something like that. But this
seems to be a little bit bloated just for one signal. :)
Are there any other better ways I am not yet aware of. What do you think?
Bye, Christian
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On Thu, 2004-07-01 at 00:29, Christian Tröster wrote:
Hi!
I'd like to notify a user space application if an interrupt occurs. I
had no
problems to install a custom signal handler but I am not sure what's
the best
way to notify the application.
Mostly a stripped-down ppdev.
--
Stefan Nickl
Kontron Modular Computers
Hi Stefan!
Stefan Nickl schrieb:
On Thu, 2004-07-01 at 00:29, Christian Tröster wrote:
quoted
I'd like to notify a user space application if an interrupt occurs. I
had no
problems to install a custom signal handler but I am not sure what's
the best
way to notify the application.
Mostly a stripped-down ppdev.
Thanks for posting your code. It works perfectly. I only had to change
one line adding an initialization value for the spin lock.
/*
* Open the device. It is single-open.
*/
int wfi_s_count = 0;
spinlock_t wfi_s_lock;
spinlock_t wfi_s_lock = SPIN_LOCK_UNLOCKED;
static int wfi_open (struct inode *inode, struct file *file)
{
file->private_data = &wfi_global;
Bye, Christian
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