1 /*
2 * Copyright (C) 2008 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 #ifndef ANDROID_INCLUDE_HARDWARE_QEMUD_H
18 #define ANDROID_INCLUDE_HARDWARE_QEMUD_H
19
20 #include <cutils/sockets.h>
21 #include "qemu_pipe.h"
22
23 /* the following is helper code that is used by the QEMU-specific
24 * hardware HAL modules to communicate with the emulator program
25 * through the 'qemud' multiplexing daemon, or through the qemud
26 * pipe.
27 *
28 * see the documentation comments for details in
29 * development/emulator/qemud/qemud.c
30 *
31 * all definitions here are built into the HAL module to avoid
32 * having to write a tiny shared library for this.
33 */
34
35 /* we expect the D macro to be defined to a function macro
36 * that sends its formatted string argument(s) to the log.
37 * If not, ignore the traces.
38 */
39 #ifndef D
40 # define D(...) do{}while(0)
41 #endif
42
43
44 static __inline__ int
qemud_channel_open(const char * name)45 qemud_channel_open(const char* name)
46 {
47 int fd;
48 int namelen = strlen(name);
49 char answer[2];
50 char pipe_name[256];
51
52 /* First, try to connect to the pipe. */
53 snprintf(pipe_name, sizeof(pipe_name), "qemud:%s", name);
54 fd = qemu_pipe_open(pipe_name);
55 D("%s: pipe name %s (name %s) fd %d", __FUNCTION__, pipe_name, name, fd);
56 if (fd < 0) {
57 D("QEMUD pipe is not available for %s: %s", name, strerror(errno));
58 /* If pipe is not available, connect to qemud control socket */
59 fd = socket_local_client( "qemud",
60 ANDROID_SOCKET_NAMESPACE_RESERVED,
61 SOCK_STREAM );
62 if (fd < 0) {
63 D("no qemud control socket: %s", strerror(errno));
64 return -1;
65 }
66
67 /* send service name to connect */
68 if (!WriteFully(fd, name, namelen)) {
69 D("can't send service name to qemud: %s",
70 strerror(errno));
71 close(fd);
72 return -1;
73 }
74
75 /* read answer from daemon */
76 if (!ReadFully(fd, answer, 2) ||
77 answer[0] != 'O' || answer[1] != 'K') {
78 D("cant' connect to %s service through qemud", name);
79 close(fd);
80 return -1;
81 }
82 }
83 return fd;
84 }
85
86 static __inline__ int
qemud_channel_send(int fd,const void * msg,int msglen)87 qemud_channel_send(int fd, const void* msg, int msglen)
88 {
89 char header[5];
90
91 if (msglen < 0)
92 msglen = strlen((const char*)msg);
93
94 if (msglen == 0)
95 return 0;
96
97 snprintf(header, sizeof header, "%04x", msglen);
98 if (!WriteFully(fd, header, 4)) {
99 D("can't write qemud frame header: %s", strerror(errno));
100 return -1;
101 }
102
103 if (!WriteFully(fd, msg, msglen)) {
104 D("can4t write qemud frame payload: %s", strerror(errno));
105 return -1;
106 }
107 return 0;
108 }
109
110 static __inline__ int
qemud_channel_recv(int fd,void * msg,int msgsize)111 qemud_channel_recv(int fd, void* msg, int msgsize)
112 {
113 char header[5];
114 int size;
115
116 if (!ReadFully(fd, header, 4)) {
117 D("can't read qemud frame header: %s", strerror(errno));
118 return -1;
119 }
120 header[4] = 0;
121 if (sscanf(header, "%04x", &size) != 1) {
122 D("malformed qemud frame header: '%.*s'", 4, header);
123 return -1;
124 }
125 if (size > msgsize)
126 return -1;
127
128 if (!ReadFully(fd, msg, size)) {
129 D("can't read qemud frame payload: %s", strerror(errno));
130 return -1;
131 }
132 return size;
133 }
134
135 #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_H */
136