int
_tap_ctl_stats_connect_and_send(pid_t pid, int minor)
{
struct timeval timeout = { .tv_sec = 10, .tv_usec = 0 };
tapdisk_message_t message;
int sfd, err;
err = tap_ctl_connect_id(pid, &sfd);
if (err)
return err;
memset(&message, 0, sizeof(message));
message.type = TAPDISK_MESSAGE_STATS;
message.cookie = minor;
err = tap_ctl_write_message(sfd, &message, &timeout);
if (err)
return err;
return sfd;
}
ssize_t
tap_ctl_stats(pid_t pid, int minor, char *buf, size_t size)
{
tapdisk_message_t message;
int sfd, err;
size_t len;
sfd = _tap_ctl_stats_connect_and_send(pid, minor);
if (sfd < 0)
return sfd;
err = tap_ctl_read_message(sfd, &message, NULL);
if (err)
return err;
len= message.u.info.length;
if (len < 0) {
err = len;
goto out;
}
if (size < len + 1)
len = size - 1;
err = tap_ctl_read_raw(sfd, buf, len, NULL);
if (err)
goto out;
buf[len] = 0;
out:
close(sfd);
return err;
}
int
tap_ctl_read_message(int fd, tapdisk_message_t * message,
struct timeval *timeout)
{
size_t size = sizeof(tapdisk_message_t);
int err;
err = tap_ctl_read_raw(fd, message, size, timeout);
if (err)
return err;
DBG("received '%s' message (uuid = %u)\n",
tapdisk_message_name(message->type), message->cookie);
return 0;
}