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tap: invoke downscript when we exit abnormally

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Right now, downscript is not invoked reliably.  If you execute 'quit' from the
monitor, it won't be invoked.

This fixes that by converting tap to use an exit_notifier to execute the
downscript.  In this case, allowing an exit notifier to include state is
critically important for the conversion.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori
2010-03-19 15:27:38 -05:00
parent d7234f4d7e
commit 8af8ce4d61
1 changed files with 16 additions and 0 deletions
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net/tap.c
+16
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@@ -53,6 +53,7 @@ typedef struct TAPState {
char down_script[1024];
char down_script_arg[128];
uint8_t buf[TAP_BUFSIZE];
Notifier exit_notifier;
unsigned int read_poll : 1;
unsigned int write_poll : 1;
unsigned int has_vnet_hdr : 1;
@@ -261,6 +262,19 @@ static void tap_cleanup(VLANClientState *nc)
tap_read_poll(s, 0);
tap_write_poll(s, 0);
close(s->fd);
exit_notifier_remove(&s->exit_notifier);
}
/* Instead of exiting gracefully, we're exiting because someone called
* exit(), make sure to invoke down script at least
*/
static void tap_cleanup_at_exit(Notifier *notifier)
{
TAPState *s = container_of(notifier, TAPState, exit_notifier);
if (s->down_script[0]) {
launch_script(s->down_script, s->down_script_arg, s->fd);
}
}
static void tap_poll(VLANClientState *nc, bool enable)
@@ -299,6 +313,8 @@ static TAPState *net_tap_fd_init(VLANState *vlan,
s->has_vnet_hdr = vnet_hdr != 0;
s->using_vnet_hdr = 0;
s->has_ufo = tap_probe_has_ufo(s->fd);
s->exit_notifier.notify = tap_cleanup_at_exit;
exit_notifier_add(&s->exit_notifier);
tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
tap_read_poll(s, 1);
return s;