On Thu, May 15, 2008 at 10:09:35AM -0700, Wim Colgate wrote:
> Hi,
>
>
>
> I'm not quite sure why no one in the community hasn't been able to
> answer my questions.
Probably b/c folks are too busy..
>
>
>
> Simply (re)stated:
>
>
>
> 1) Are there hooks for dm/multipath events to notify software?
You can also listen to the NETLINK_DM socket and parse the data.
But that complicated by the fact that there is only one
socket that the kernel uses and it cannot be shared.
>
> 2) does path down/up fire up udev rules?
Yes. I am attaching a simple program you can use to listen to the kobject uevents
that get fired.
You can also modify it to use NETLINK_DM instead of NETLINK_KOBJECT_UEVENT and see
what comes out.
#include <sys/socket.h>
#include <linux/netlink.h>
#include <stdio.h>
#include <string.h>
#define MAX_PAYLOAD 1024 /* maximum payload size */
struct sockaddr_nl src_addr;
int sock_fd;
static char buff[MAX_PAYLOAD];
ssize_t buflen;
int
main ()
{
sock_fd = socket (PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
memset (&src_addr, 0, sizeof (src_addr));
src_addr.nl_family = AF_NETLINK;
src_addr.nl_pid = getpid (); /* self pid */
src_addr.nl_groups = 0xffffffff;
printf ("Listen..\n");
bind (sock_fd, (struct sockaddr *) &src_addr, sizeof (src_addr));
printf ("Receiving..\n");
while (1)
{
buflen = recv (sock_fd, &buff, sizeof (buff), 0);
printf ("Got data: %d\n", buflen);
int i, bufpos;
char *key;
for (i = 0, bufpos = 0; (bufpos < buflen) && i < MAX_PAYLOAD; i++)
{
key = &buff[bufpos];
printf ("[%s]\n", key);
bufpos += strlen (key) + 1;
}
memset (&buff, 0, MAX_PAYLOAD);
}
/* Close Netlink Socket */
close (sock_fd);
return 0;
}
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