static void udev_hotplug_event(struct udev_device* udev_dev)
{
const char* udev_action;
const char* sys_name = NULL;
uint8_t busnum = 0, devaddr = 0;
int detached;
int r;
do {
udev_action = udev_device_get_action(udev_dev);
if (!udev_action) {
break;
}
detached = !strncmp(udev_action, "remove", 6);
r = udev_device_info(NULL, detached, udev_dev, &busnum, &devaddr, &sys_name);
if (LIBUSB_SUCCESS != r) {
break;
}
usbi_dbg("udev hotplug event. action: %s.", udev_action);
if (strncmp(udev_action, "add", 3) == 0) {
linux_hotplug_enumerate(busnum, devaddr, sys_name);
} else if (detached) {
linux_hotplug_disconnected(busnum, devaddr, sys_name);
} else {
usbi_err(NULL, "ignoring udev action %s", udev_action);
}
} while (0);
udev_device_unref(udev_dev);
}
static int linux_netlink_read_message(void)
{
unsigned char buffer[1024];
struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer)};
struct msghdr meh = { .msg_iov=&iov, .msg_iovlen=1,
.msg_name=&snl, .msg_namelen=sizeof(snl) };
const char *sys_name = NULL;
uint8_t busnum, devaddr;
int detached, r;
size_t len;
/* read netlink message */
memset(buffer, 0, sizeof(buffer));
len = recvmsg(linux_netlink_socket, &meh, 0);
if (len < 32) {
if (errno != EAGAIN)
usbi_dbg("error recieving message from netlink");
return -1;
}
/* TODO -- authenticate this message is from the kernel or udevd */
r = linux_netlink_parse(buffer, len, &detached, &sys_name,
&busnum, &devaddr);
if (r)
return r;
usbi_dbg("netlink hotplug found device busnum: %hhu, devaddr: %hhu, sys_name: %s, removed: %s",
busnum, devaddr, sys_name, detached ? "yes" : "no");
/* signal device is available (or not) to all contexts */
if (detached)
linux_hotplug_disconnected(busnum, devaddr, sys_name);
else
linux_hotplug_enumerate(busnum, devaddr, sys_name);
return 0;
}
static void *linux_netlink_event_thread_main(void *arg)
{
char dummy;
int r;
struct pollfd fds[] = {
{ .fd = netlink_control_pipe[0],
.events = POLLIN },
{ .fd = linux_netlink_socket,
.events = POLLIN },
};
static int linux_netlink_read_message(void)
{
unsigned char buffer[1024];
struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer)};
struct msghdr meh = { .msg_iov=&iov, .msg_iovlen=1,
.msg_name=&snl, .msg_namelen=sizeof(snl) };
const char *sys_name = NULL;
uint8_t busnum, devaddr;
int detached, r;
size_t len;
/* read netlink message */
memset(buffer, 0, sizeof(buffer));
len = recvmsg(linux_netlink_socket, &meh, 0);
if (len < 32) {
if (errno != EAGAIN)
usbi_dbg("error recieving message from netlink");
return -1;
}
/* TODO -- authenticate this message is from the kernel or udevd */
r = linux_netlink_parse(buffer, len, &detached, &sys_name,
&busnum, &devaddr);
if (r)
return r;
usbi_dbg("netlink hotplug found device busnum: %hhu, devaddr: %hhu, sys_name: %s, removed: %s",
busnum, devaddr, sys_name, detached ? "yes" : "no");
/* signal device is available (or not) to all contexts */
if (detached)
linux_hotplug_disconnected(busnum, devaddr, sys_name);
else
linux_hotplug_enumerate(busnum, devaddr, sys_name);
return 0;
}
static void *linux_netlink_event_thread_main(void *arg)
{
struct pollfd fds = {.fd = linux_netlink_socket,
.events = POLLIN};
/* silence compiler warning */
(void) arg;
while (1 == poll(&fds, 1, -1)) {
if (POLLIN != fds.revents) {
break;
}
usbi_mutex_static_lock(&linux_hotplug_lock);
linux_netlink_read_message();
usbi_mutex_static_unlock(&linux_hotplug_lock);
}
return NULL;
}
void linux_netlink_hotplug_poll(void)
{
int r;
usbi_mutex_static_lock(&linux_hotplug_lock);
do {
r = linux_netlink_read_message();
} while (r == 0);
usbi_mutex_static_unlock(&linux_hotplug_lock);
}