Re: [PATCH] udev enhancements to use kernel event queue

[Greg KH]

On Thu, Jun 12, 2003 at 04:02:47PM -0700, Greg KH wrote:
> On Thu, Jun 12, 2003 at 03:51:48PM -0700, Andrew Morton wrote:
> > Greg KH <[e-mail]> wrote:
> > >
> > > <handwaving>
> > 
> > heh.
> > 
> > Thought about adding a sequence number to the /sbin/hotplug argument list?
> 
> /me owes you a lot of beer at ols.
> 
> That's a world simpler than my proposal, I think I'll go write that
> patch right now...

Pat, here's a patch to add a sequence number to kobject hotplug calls to
help userspace out a lot.

thanks,

greg k-h

# kobject: add sequence number to hotplug events to help userspace out.

diff -Nru a/lib/kobject.c b/lib/kobject.c
--- a/lib/kobject.c	Thu Jun 12 16:05:06 2003
+++ b/lib/kobject.c	Thu Jun 12 16:05:06 2003
@@ -100,6 +100,7 @@
 
 #define BUFFER_SIZE	1024	/* should be enough memory for the env */
 #define NUM_ENVP	32	/* number of env pointers */
+static unsigned long sequence_num;
 static void kset_hotplug(const char *action, struct kset *kset,
 			 struct kobject *kobj)
 {
@@ -151,6 +152,10 @@
 
 	envp [i++] = scratch;
 	scratch += sprintf(scratch, "ACTION=%s", action) + 1;
+
+	envp [i++] = scratch;
+	scratch += sprintf(scratch, "SEQNUM=%ld", sequence_num) + 1;
+	++sequence_num;
 
 	kobj_path_length = get_kobj_path_length (kset, kobj);
 	kobj_path = kmalloc (kobj_path_length, GFP_KERNEL);