Frank Maker | ed6b39c | 2011-05-23 21:14:58 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | /* NOTICE: This is a clean room re-implementation of libnl */ |
| 18 | |
| 19 | #include <malloc.h> |
| 20 | #include "netlink-types.h" |
| 21 | #include "netlink/handlers.h" |
| 22 | |
| 23 | /* Allocate a new callback handle. */ |
| 24 | struct nl_cb *nl_cb_alloc(enum nl_cb_kind kind) |
| 25 | { |
| 26 | struct nl_cb *cb; |
| 27 | |
| 28 | cb = (struct nl_cb *) malloc(sizeof(struct nl_cb)); |
| 29 | if (cb == NULL) |
| 30 | goto fail; |
| 31 | memset(cb, 0, sizeof(*cb)); |
| 32 | |
| 33 | return nl_cb_get(cb); |
| 34 | fail: |
| 35 | return NULL; |
| 36 | } |
| 37 | |
| 38 | /* Clone an existing callback handle */ |
| 39 | struct nl_cb *nl_cb_clone(struct nl_cb *orig) |
| 40 | { |
| 41 | struct nl_cb *new_cb; |
| 42 | int new_refcnt; |
| 43 | |
| 44 | new_cb = nl_cb_alloc(NL_CB_DEFAULT); |
| 45 | if (new_cb == NULL) |
| 46 | goto fail; |
| 47 | |
| 48 | /* Preserve reference count and copy original */ |
| 49 | new_refcnt = new_cb->cb_refcnt; |
| 50 | memcpy(new_cb, orig, sizeof(*orig)); |
| 51 | new_cb->cb_refcnt = new_refcnt; |
| 52 | |
| 53 | return new_cb; |
| 54 | fail: |
| 55 | return NULL; |
| 56 | } |
| 57 | |
| 58 | /* Set up a callback. */ |
| 59 | int nl_cb_set(struct nl_cb *cb, enum nl_cb_type type, enum nl_cb_kind kind, \ |
| 60 | nl_recvmsg_msg_cb_t func, void *arg) |
| 61 | { |
| 62 | cb->cb_set[type] = func; |
| 63 | cb->cb_args[type] = arg; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | |
| 68 | |
| 69 | /* Set up an error callback. */ |
| 70 | int nl_cb_err(struct nl_cb *cb, enum nl_cb_kind kind, \ |
| 71 | nl_recvmsg_err_cb_t func, void *arg) |
| 72 | { |
| 73 | cb->cb_err = func; |
| 74 | cb->cb_err_arg = arg; |
| 75 | return 0; |
| 76 | |
| 77 | } |
| 78 | |
| 79 | struct nl_cb *nl_cb_get(struct nl_cb *cb) |
| 80 | { |
| 81 | cb->cb_refcnt++; |
| 82 | return cb; |
| 83 | } |
| 84 | |
| 85 | void nl_cb_put(struct nl_cb *cb) |
| 86 | { |
| 87 | cb->cb_refcnt--; |
| 88 | if (cb->cb_refcnt <= 0) |
| 89 | free(cb); |
| 90 | |
| 91 | } |
| 92 | |