1 /*
2 * Copyright (C) 2020 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 #include <errno.h>
18 #include <fcntl.h>
19 #include <stdio.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <qemud.h>
23 #include <qemu_pipe_bp.h>
24 #include <unistd.h>
25
qemud_channel_open(const char * name)26 int qemud_channel_open(const char* name) {
27 return qemu_pipe_open_ns("qemud", name, O_RDWR);
28 }
29
qemud_channel_send(int pipe,const void * msg,int size)30 int qemud_channel_send(int pipe, const void* msg, int size) {
31 char header[5];
32
33 if (size < 0)
34 size = strlen((const char*)msg);
35
36 if (size == 0)
37 return 0;
38
39 snprintf(header, sizeof(header), "%04x", size);
40 if (qemu_pipe_write_fully(pipe, header, 4)) {
41 return -1;
42 }
43
44 if (qemu_pipe_write_fully(pipe, msg, size)) {
45 return -1;
46 }
47
48 return 0;
49 }
50
qemud_channel_recv(int pipe,void * msg,int maxsize)51 int qemud_channel_recv(int pipe, void* msg, int maxsize) {
52 char header[5];
53 int size;
54
55 if (qemu_pipe_read_fully(pipe, header, 4)) {
56 return -1;
57 }
58 header[4] = 0;
59
60 if (sscanf(header, "%04x", &size) != 1) {
61 return -1;
62 }
63 if (size > maxsize) {
64 return -1;
65 }
66
67 if (qemu_pipe_read_fully(pipe, msg, size)) {
68 return -1;
69 }
70
71 return size;
72 }
73