X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Flib%2Flibudev-monitor.c;h=454a646046451d18f0c1f905abd16f7e8bf02fbd;hp=fbb21d04eaeb849c7c3c2f71814c203a79ca4f05;hb=37372bbc38d8542f482d90b26c90714429584421;hpb=ba6929f6690a72485ac3c6b7610ffbd5ab319be7

diff --git a/udev/lib/libudev-monitor.c b/udev/lib/libudev-monitor.c
index fbb21d04e..454a64604 100644
--- a/udev/lib/libudev-monitor.c
+++ b/udev/lib/libudev-monitor.c
@@ -37,15 +37,31 @@
 struct udev_monitor {
 	struct udev *udev;
 	int refcount;
-	int socket;
+	int sock;
+	struct sockaddr_un saddr;
+	socklen_t addrlen;
 };
 
+/**
+ * udev_monitor_new_from_socket:
+ * @udev: udev library context
+ * @socket_path: unix socket path
+ *
+ * Create new udev monitor, setup and connect to a specified socket. The
+ * path to a socket can point to an existing socket file, or it will be
+ * created if needed. If neccessary, the permissions adjustment as well as
+ * the later cleanup of the socket file, needs to be done by the caller.
+ * If the socket path starts with a '@' character, an abstract namespace
+ * socket will be used.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the ressources of the udev monitor.
+ *
+ * Returns: a new udev monitor, or #NULL, in case of an error
+ **/
 struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path)
 {
 	struct udev_monitor *udev_monitor;
-	struct sockaddr_un saddr;
-	socklen_t addrlen;
-	const int on = 1;
 
 	if (udev == NULL)
 		return NULL;
@@ -58,36 +74,49 @@ struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char
 	udev_monitor->refcount = 1;
 	udev_monitor->udev = udev;
 
-	memset(&saddr, 0x00, sizeof(saddr));
-	saddr.sun_family = AF_LOCAL;
-	strcpy(saddr.sun_path, socket_path);
-	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
+	udev_monitor->saddr.sun_family = AF_LOCAL;
+	strcpy(udev_monitor->saddr.sun_path, socket_path);
+	udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(udev_monitor->saddr.sun_path);
 
 	/* translate leading '@' to abstract namespace */
-	if (saddr.sun_path[0] == '@')
-		saddr.sun_path[0] = '\0';
+	if (udev_monitor->saddr.sun_path[0] == '@')
+		udev_monitor->saddr.sun_path[0] = '\0';
 
-	udev_monitor->socket = socket(AF_LOCAL, SOCK_DGRAM, 0);
-	if (udev_monitor->socket == -1) {
-		log_err(udev, "error getting socket: %s\n", strerror(errno));
+	udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+	if (udev_monitor->sock == -1) {
+		err(udev, "error getting socket: %s\n", strerror(errno));
 		free(udev_monitor);
 		return NULL;
 	}
+	info(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
+	return udev_monitor;
+}
 
-	if (bind(udev_monitor->socket, (struct sockaddr *) &saddr, addrlen) < 0) {
-		log_err(udev, "bind failed: %s\n", strerror(errno));
-		close(udev_monitor->socket);
-		free(udev_monitor);
-		return NULL;
+int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
+{
+	int err;
+	const int on = 1;
+
+	err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->saddr, udev_monitor->addrlen);
+	if (err < 0) {
+		err(udev_monitor->udev, "bind failed: %s\n", strerror(errno));
+		return err;
 	}
 
 	/* enable receiving of the sender credentials */
-	setsockopt(udev_monitor->socket, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
-	log_info(udev_monitor->udev, "udev_monitor: %p created\n", udev_monitor);
-
-	return udev_monitor;
+	setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
+	info(udev_monitor->udev, "monitor %p listening\n", udev_monitor);
+	return 0;
 }
 
+/**
+ * udev_monitor_ref:
+ * @udev_monitor: udev monitor
+ *
+ * Take a reference of a udev monitor.
+ *
+ * Returns: the passed udev monitor
+ **/
 struct udev_monitor *udev_monitor_ref(struct udev_monitor *udev_monitor)
 {
 	if (udev_monitor == NULL)
@@ -96,6 +125,15 @@ struct udev_monitor *udev_monitor_ref(struct udev_monitor *udev_monitor)
 	return udev_monitor;
 }
 
+/**
+ * udev_monitor_unref:
+ * @udev_monitor: udev monitor
+ *
+ * Drop a reference ofa udev monitor. If the refcount reaches zero,
+ * the bound socket will be closed, and the ressources of the monitor
+ * will be released.
+ *
+ **/
 void udev_monitor_unref(struct udev_monitor *udev_monitor)
 {
 	if (udev_monitor == NULL)
@@ -103,11 +141,20 @@ void udev_monitor_unref(struct udev_monitor *udev_monitor)
 	udev_monitor->refcount--;
 	if (udev_monitor->refcount > 0)
 		return;
-	close(udev_monitor->socket);
-	log_info(udev_monitor->udev, "udev_monitor: %p released\n", udev_monitor);
+	if (udev_monitor->sock >= 0)
+		close(udev_monitor->sock);
+	info(udev_monitor->udev, "monitor %p released\n", udev_monitor);
 	free(udev_monitor);
 }
 
+/**
+ * udev_monitor_get_udev:
+ * @udev_monitor: udev monitor
+ *
+ * Retrieve the udev library context the monitor was created with.
+ *
+ * Returns: the udev library context
+ **/
 struct udev *udev_monitor_get_udev(struct udev_monitor *udev_monitor)
 {
 	if (udev_monitor == NULL)
@@ -115,14 +162,38 @@ struct udev *udev_monitor_get_udev(struct udev_monitor *udev_monitor)
 	return udev_monitor->udev;
 }
 
+/**
+ * udev_monitor_get_fd:
+ * @udev_monitor: udev monitor
+ *
+ * Retrieve the socket file descriptor associated with the monitor.
+ *
+ * Returns: the socket file descriptor
+ **/
 int udev_monitor_get_fd(struct udev_monitor *udev_monitor)
 {
 	if (udev_monitor == NULL)
 		return -1;
-	return udev_monitor->socket;
+	return udev_monitor->sock;
 }
 
-struct udev_device *udev_monitor_get_device(struct udev_monitor *udev_monitor)
+/**
+ * udev_monitor_receive_device:
+ * @udev_monitor: udev monitor
+ *
+ * Receive data from the udev monitor socket, allocate a new udev
+ * device, fill in the received data, and return the device.
+ *
+ * Only socket connections with uid=0 are accepted. The caller
+ * needs to make sure, that there is data to read from the socket,
+ * the call will block until the socket becomes readable.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the ressources of the udev device.
+ *
+ * Returns: a new udev device, or #NULL, in case of an error
+ **/
+struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monitor)
 {
 	struct udev_device *udev_device;
 	struct msghdr smsg;
@@ -132,6 +203,8 @@ struct udev_device *udev_monitor_get_device(struct udev_monitor *udev_monitor)
 	char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
 	char buf[4096];
 	size_t bufpos;
+	int maj = 0;
+	int min = 0;
 
 	if (udev_monitor == NULL)
 		return NULL;
@@ -144,34 +217,34 @@ struct udev_device *udev_monitor_get_device(struct udev_monitor *udev_monitor)
 	smsg.msg_control = cred_msg;
 	smsg.msg_controllen = sizeof(cred_msg);
 
-	if (recvmsg(udev_monitor->socket, &smsg, 0) < 0) {
+	if (recvmsg(udev_monitor->sock, &smsg, 0) < 0) {
 		if (errno != EINTR)
-			log_info(udev_monitor->udev, "unable to receive message");
+			info(udev_monitor->udev, "unable to receive message");
 		return NULL;
 	}
 	cmsg = CMSG_FIRSTHDR(&smsg);
 	cred = (struct ucred *)CMSG_DATA (cmsg);
 
 	if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
-		log_info(udev_monitor->udev, "no sender credentials received, message ignored");
+		info(udev_monitor->udev, "no sender credentials received, message ignored");
 		return NULL;
 	}
 
 	if (cred->uid != 0) {
-		log_info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
+		info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
 		return NULL;
 	}
 
 	/* skip header */
 	bufpos = strlen(buf) + 1;
 	if (bufpos < sizeof("a@/d") || bufpos >= sizeof(buf)) {
-		log_info(udev_monitor->udev, "invalid message length");
+		info(udev_monitor->udev, "invalid message length");
 		return NULL;
 	}
 
 	/* check message header */
 	if (strstr(buf, "@/") == NULL) {
-		log_info(udev_monitor->udev, "unrecognized message header");
+		info(udev_monitor->udev, "unrecognized message header");
 		return NULL;
 	}
 
@@ -191,26 +264,43 @@ struct udev_device *udev_monitor_get_device(struct udev_monitor *udev_monitor)
 		bufpos += keylen + 1;
 
 		if (strncmp(key, "DEVPATH=", 8) == 0) {
-			udev_device->devpath = strdup(&key[8]);
+			device_set_devpath(udev_device, &key[8]);
 		} else if (strncmp(key, "SUBSYSTEM=", 10) == 0) {
-			udev_device->subsystem = strdup(&key[10]);
+			device_set_subsystem(udev_device, &key[10]);
 		} else if (strncmp(key, "DEVNAME=", 8) == 0) {
-			udev_device->devname = strdup(&key[8]);
+			device_set_devname(udev_device, &key[8]);
 		} else if (strncmp(key, "DEVLINKS=", 9) == 0) {
 			char *slink = &key[9];
 			char *next = strchr(slink, ' ');
 
 			while (next != NULL) {
 				next[0] = '\0';
-				name_list_add(&udev_device->link_list, slink, 0);
+				device_add_devlink(udev_device, slink);
 				slink = &next[1];
 				next = strchr(slink, ' ');
 			}
 			if (slink[0] != '\0')
-				name_list_add(&udev_device->link_list, slink, 0);
+				device_add_devlink(udev_device, slink);
+		} else if (strncmp(key, "DRIVER=", 7) == 0) {
+			device_set_driver(udev_device, &key[7]);
+		} else if (strncmp(key, "ACTION=", 7) == 0) {
+			device_set_action(udev_device, &key[7]);
+		} else if (strncmp(key, "MAJOR=", 6) == 0) {
+			maj = strtoull(&key[6], NULL, 10);
+		} else if (strncmp(key, "MINOR=", 6) == 0) {
+			min = strtoull(&key[6], NULL, 10);
+		} else if (strncmp(key, "DEVPATH_OLD=", 12) == 0) {
+			device_set_devpath_old(udev_device, &key[12]);
+		} else if (strncmp(key, "PHYSDEVPATH=", 12) == 0) {
+			device_set_physdevpath(udev_device, &key[12]);
+		} else if (strncmp(key, "SEQNUM=", 7) == 0) {
+			device_set_seqnum(udev_device, strtoull(&key[7], NULL, 10));
+		} else if (strncmp(key, "TIMEOUT=", 8) == 0) {
+			device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
 		}
-		name_list_add(&udev_device->env_list, key, 0);
+		device_add_property(udev_device, key);
 	}
+	device_set_devnum(udev_device, makedev(maj, min));
 
 	return udev_device;
 }