1 /* 2 * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU Lesser General Public License version 2.1 6 * as published by the Free Software Foundation 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include "libubus.h" 15 #include "libubus-internal.h" 16 17 static int ubus_subscriber_cb(struct ubus_context *ctx, struct ubus_object *obj, 18 struct ubus_request_data *req, 19 const char *method, struct blob_attr *msg) 20 { 21 struct ubus_subscriber *s; 22 23 s = container_of(obj, struct ubus_subscriber, obj); 24 if (s->cb) 25 return s->cb(ctx, obj, req, method, msg); 26 return 0; 27 } 28 29 const struct ubus_method watch_method __hidden = { 30 .name = NULL, 31 .handler = ubus_subscriber_cb, 32 }; 33 34 int ubus_register_subscriber(struct ubus_context *ctx, struct ubus_subscriber *s) 35 { 36 struct ubus_object *obj = &s->obj; 37 38 obj->methods = &watch_method; 39 obj->n_methods = 1; 40 41 return ubus_add_object(ctx, obj); 42 } 43 44 static int 45 __ubus_subscribe_request(struct ubus_context *ctx, struct ubus_object *obj, uint32_t id, int type) 46 { 47 struct ubus_request req; 48 49 blob_buf_init(&b, 0); 50 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id); 51 blob_put_int32(&b, UBUS_ATTR_TARGET, id); 52 53 if (ubus_start_request(ctx, &req, b.head, type, 0) < 0) 54 return UBUS_STATUS_INVALID_ARGUMENT; 55 56 return ubus_complete_request(ctx, &req, 0); 57 58 } 59 60 int ubus_subscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id) 61 { 62 return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_SUBSCRIBE); 63 } 64 65 int ubus_unsubscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id) 66 { 67 return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_UNSUBSCRIBE); 68 } 69 70
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