1 /*
2  * Copyright (C) 2007 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 #define LOG_TAG "NativeHandle"
18 
19 #include <stdint.h>
20 #include <errno.h>
21 #include <string.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 
25 #include <cutils/log.h>
26 #include <cutils/native_handle.h>
27 
28 static const int kMaxNativeFds = 1024;
29 static const int kMaxNativeInts = 1024;
30 
native_handle_create(int numFds,int numInts)31 native_handle_t* native_handle_create(int numFds, int numInts)
32 {
33     if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) {
34         return NULL;
35     }
36 
37     size_t mallocSize = sizeof(native_handle_t) + (sizeof(int) * (numFds + numInts));
38     native_handle_t* h = malloc(mallocSize);
39     if (h) {
40         h->version = sizeof(native_handle_t);
41         h->numFds = numFds;
42         h->numInts = numInts;
43     }
44     return h;
45 }
46 
native_handle_delete(native_handle_t * h)47 int native_handle_delete(native_handle_t* h)
48 {
49     if (h) {
50         if (h->version != sizeof(native_handle_t))
51             return -EINVAL;
52         free(h);
53     }
54     return 0;
55 }
56 
native_handle_close(const native_handle_t * h)57 int native_handle_close(const native_handle_t* h)
58 {
59     if (h->version != sizeof(native_handle_t))
60         return -EINVAL;
61 
62     const int numFds = h->numFds;
63     int i;
64     for (i=0 ; i<numFds ; i++) {
65         close(h->data[i]);
66     }
67     return 0;
68 }
69