[Service]
Type=notify
OOMScoreAdjust=-1000
+Restart=on-failure
ExecStart=@sbindir@/udevd
[Socket]
ListenSequentialPacket=@/org/kernel/udev/udevd
+ListenNetlink=kobject-uevent 1
int sock;
struct sockaddr_un saddr;
socklen_t addrlen;
+ bool bound;
bool connected;
};
return uctrl;
}
-struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path)
+struct udev_ctrl *udev_ctrl_new_from_socket_fd(struct udev *udev, const char *socket_path, int fd)
{
struct udev_ctrl *uctrl;
if (uctrl == NULL)
return NULL;
- uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET, 0);
- if (uctrl->sock < 0) {
- err(udev, "error getting socket: %m\n");
- udev_ctrl_unref(uctrl);
- return NULL;
+ if (fd < 0) {
+ uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_CLOEXEC, 0);
+ if (uctrl->sock < 0) {
+ err(udev, "error getting socket: %m\n");
+ udev_ctrl_unref(uctrl);
+ return NULL;
+ }
+ } else {
+ uctrl->bound = true;
+ uctrl->sock = fd;
}
uctrl->saddr.sun_family = AF_LOCAL;
return uctrl;
}
-struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd)
+struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path)
{
- struct udev_ctrl *uctrl;
-
- uctrl = udev_ctrl_new(udev);
- if (uctrl == NULL)
- return NULL;
- uctrl->sock = fd;
-
- return uctrl;
+ return udev_ctrl_new_from_socket_fd(udev, socket_path, -1);
}
int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl)
{
int err;
- if (uctrl->addrlen > 0) {
+ if (!uctrl->bound) {
err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
if (err < 0) {
err = -errno;
err(uctrl->udev, "bind failed: %m\n");
return err;
}
+
err = listen(uctrl->sock, 0);
if (err < 0) {
err = -errno;
err(uctrl->udev, "listen failed: %m\n");
return err;
}
+
+ uctrl->bound = true;
}
return 0;
}
socklen_t addrlen;
struct udev_list_node filter_subsystem_list;
struct udev_list_node filter_tag_list;
+ bool bound;
};
enum udev_monitor_netlink_group {
return udev_monitor;
}
-/**
- * udev_monitor_new_from_netlink:
- * @udev: udev library context
- * @name: name of event source
- *
- * Create new udev monitor and connect to a specified event
- * source. Valid sources identifiers are "udev" and "kernel".
- *
- * Applications should usually not connect directly to the
- * "kernel" events, because the devices might not be useable
- * at that time, before udev has configured them, and created
- * device nodes.
- *
- * Accessing devices at the same time as udev, might result
- * in unpredictable behavior.
- *
- * The "udev" events are sent out after udev has finished its
- * event processing, all rules have been processed, and needed
- * device nodes are created.
- *
- * The initial refcount is 1, and needs to be decremented to
- * release the resources of the udev monitor.
- *
- * Returns: a new udev monitor, or #NULL, in case of an error
- **/
-struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev, const char *name)
+struct udev_monitor *udev_monitor_new_from_netlink_fd(struct udev *udev, const char *name, int fd)
{
struct udev_monitor *udev_monitor;
unsigned int group;
if (udev_monitor == NULL)
return NULL;
- udev_monitor->sock = socket(PF_NETLINK, SOCK_DGRAM|SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT);
- if (udev_monitor->sock == -1) {
- err(udev, "error getting socket: %m\n");
- free(udev_monitor);
- return NULL;
+ if (fd < 0) {
+ udev_monitor->sock = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT);
+ if (udev_monitor->sock == -1) {
+ err(udev, "error getting socket: %m\n");
+ free(udev_monitor);
+ return NULL;
+ }
+ } else {
+ udev_monitor->bound = true;
+ udev_monitor->sock = fd;
}
udev_monitor->snl.nl_family = AF_NETLINK;
return udev_monitor;
}
+/**
+ * udev_monitor_new_from_netlink:
+ * @udev: udev library context
+ * @name: name of event source
+ *
+ * Create new udev monitor and connect to a specified event
+ * source. Valid sources identifiers are "udev" and "kernel".
+ *
+ * Applications should usually not connect directly to the
+ * "kernel" events, because the devices might not be useable
+ * at that time, before udev has configured them, and created
+ * device nodes.
+ *
+ * Accessing devices at the same time as udev, might result
+ * in unpredictable behavior.
+ *
+ * The "udev" events are sent out after udev has finished its
+ * event processing, all rules have been processed, and needed
+ * device nodes are created.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev monitor.
+ *
+ * Returns: a new udev monitor, or #NULL, in case of an error
+ **/
+struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev, const char *name)
+{
+ return udev_monitor_new_from_netlink_fd(udev, name, -1);
+}
+
static inline void bpf_stmt(struct sock_filter *inss, unsigned int *i,
unsigned short code, unsigned int data)
{
*/
int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
{
- int err;
+ int err = 0;
const int on = 1;
if (udev_monitor->sun.sun_family != 0) {
- err = bind(udev_monitor->sock,
- (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
+ if (!udev_monitor->bound) {
+ err = bind(udev_monitor->sock,
+ (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
+ if (err == 0)
+ udev_monitor->bound = true;
+ }
} else if (udev_monitor->snl.nl_family != 0) {
udev_monitor_filter_update(udev_monitor);
- err = bind(udev_monitor->sock,
- (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
+ if (!udev_monitor->bound) {
+ err = bind(udev_monitor->sock,
+ (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
+ if (err == 0)
+ udev_monitor->bound = true;
+ }
if (err == 0) {
struct sockaddr_nl snl;
socklen_t addrlen;
int udev_monitor_allow_unicast_sender(struct udev_monitor *udev_monitor, struct udev_monitor *sender);
int udev_monitor_send_device(struct udev_monitor *udev_monitor,
struct udev_monitor *destination, struct udev_device *udev_device);
+struct udev_monitor *udev_monitor_new_from_netlink_fd(struct udev *udev, const char *name, int fd);
/* libudev-ctrl.c - daemon runtime setup */
struct udev_ctrl;
struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path);
-struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd);
+struct udev_ctrl *udev_ctrl_new_from_socket_fd(struct udev *udev, const char *socket_path, int fd);
int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl);
struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl);
struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl);
return 0;
}
+static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
+{
+ int ctrl = -1, netlink = -1;
+ int fd, n;
+
+ n = sd_listen_fds(true);
+ if (n <= 0)
+ return -1;
+
+ for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
+ if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
+ if (ctrl >= 0)
+ return -1;
+ ctrl = fd;
+ continue;
+ }
+
+ if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
+ if (netlink >= 0)
+ return -1;
+ netlink = fd;
+ continue;
+ }
+
+ return -1;
+ }
+
+ if (ctrl < 0 || netlink < 0)
+ return -1;
+
+ info(udev, "ctrl=%i netlink=%i\n", ctrl, netlink);
+ *rctrl = ctrl;
+ *rnetlink = netlink;
+ return 0;
+}
+
int main(int argc, char *argv[])
{
struct udev *udev;
}
}
- /* udevadm control socket */
- if (sd_listen_fds(true) == 1 && sd_is_socket(SD_LISTEN_FDS_START, AF_LOCAL, SOCK_SEQPACKET, -1))
- udev_ctrl = udev_ctrl_new_from_fd(udev, SD_LISTEN_FDS_START);
- else
+ if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
+ /* get control and netlink socket from from systemd */
+ udev_ctrl = udev_ctrl_new_from_socket_fd(udev, UDEV_CTRL_SOCK_PATH, fd_ctrl);
+ if (udev_ctrl == NULL) {
+ err(udev, "error taking over udev control socket");
+ rc = 1;
+ goto exit;
+ }
+
+ monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
+ if (monitor == NULL) {
+ err(udev, "error taking over netlink socket\n");
+ rc = 3;
+ goto exit;
+ }
+ } else {
+ /* open control and netlink socket */
udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
- if (udev_ctrl == NULL) {
- fprintf(stderr, "error initializing udev control socket");
- err(udev, "error initializing udev control socket");
- rc = 1;
+ if (udev_ctrl == NULL) {
+ fprintf(stderr, "error initializing udev control socket");
+ err(udev, "error initializing udev control socket");
+ rc = 1;
+ goto exit;
+ }
+ fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
+
+ monitor = udev_monitor_new_from_netlink(udev, "kernel");
+ if (monitor == NULL) {
+ fprintf(stderr, "error initializing netlink socket\n");
+ err(udev, "error initializing netlink socket\n");
+ rc = 3;
+ goto exit;
+ }
+ fd_netlink = udev_monitor_get_fd(monitor);
+ }
+
+ if (udev_monitor_enable_receiving(monitor) < 0) {
+ fprintf(stderr, "error binding netlink socket\n");
+ err(udev, "error binding netlink socket\n");
+ rc = 3;
goto exit;
}
+
if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
fprintf(stderr, "error binding udev control socket\n");
err(udev, "error binding udev control socket\n");
rc = 1;
goto exit;
}
- fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
- monitor = udev_monitor_new_from_netlink(udev, "kernel");
- if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
- fprintf(stderr, "error initializing netlink socket\n");
- err(udev, "error initializing netlink socket\n");
- rc = 3;
- goto exit;
- }
udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
- fd_netlink = udev_monitor_get_fd(monitor);
if (daemonize) {
pid_t pid;
memset(&ep_ctrl, 0, sizeof(struct epoll_event));
ep_ctrl.events = EPOLLIN;
ep_ctrl.data.fd = fd_ctrl;
+
memset(&ep_inotify, 0, sizeof(struct epoll_event));
ep_inotify.events = EPOLLIN;
ep_inotify.data.fd = fd_inotify;
+
memset(&ep_signal, 0, sizeof(struct epoll_event));
ep_signal.events = EPOLLIN;
ep_signal.data.fd = fd_signal;
+
memset(&ep_netlink, 0, sizeof(struct epoll_event));
ep_netlink.events = EPOLLIN;
ep_netlink.data.fd = fd_netlink;
+
memset(&ep_worker, 0, sizeof(struct epoll_event));
ep_worker.events = EPOLLIN;
ep_worker.data.fd = fd_worker;
+
fd_ep = epoll_create1(EPOLL_CLOEXEC);
if (fd_ep < 0) {
err(udev, "error creating epoll fd: %m\n");
~ianmdlvl / elogind.git / commitdiff