blob: 5c39f9c939b00dd3337c03cca12f8cfbcafc6e88
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(...) ((void)0) |
41 | #endif |
42 | |
43 | static __inline__ int |
44 | qemud_fd_write(int fd, const void* buff, int len) |
45 | { |
46 | int len2; |
47 | do { |
48 | len2 = write(fd, buff, len); |
49 | } while (len2 < 0 && errno == EINTR); |
50 | return len2; |
51 | } |
52 | |
53 | static __inline__ int |
54 | qemud_fd_read(int fd, void* buff, int len) |
55 | { |
56 | int len2; |
57 | do { |
58 | len2 = read(fd, buff, len); |
59 | } while (len2 < 0 && errno == EINTR); |
60 | return len2; |
61 | } |
62 | |
63 | static __inline__ int |
64 | qemud_channel_open(const char* name) |
65 | { |
66 | int fd; |
67 | int namelen = strlen(name); |
68 | char answer[2]; |
69 | char pipe_name[256]; |
70 | |
71 | /* First, try to connect to the pipe. */ |
72 | snprintf(pipe_name, sizeof(pipe_name), "qemud:%s", name); |
73 | fd = qemu_pipe_open(pipe_name); |
74 | if (fd < 0) { |
75 | D("QEMUD pipe is not available for %s: %s", name, strerror(errno)); |
76 | /* If pipe is not available, connect to qemud control socket */ |
77 | fd = socket_local_client( "qemud", |
78 | ANDROID_SOCKET_NAMESPACE_RESERVED, |
79 | SOCK_STREAM ); |
80 | if (fd < 0) { |
81 | D("no qemud control socket: %s", strerror(errno)); |
82 | return -1; |
83 | } |
84 | |
85 | /* send service name to connect */ |
86 | if (qemud_fd_write(fd, name, namelen) != namelen) { |
87 | D("can't send service name to qemud: %s", |
88 | strerror(errno)); |
89 | close(fd); |
90 | return -1; |
91 | } |
92 | |
93 | /* read answer from daemon */ |
94 | if (qemud_fd_read(fd, answer, 2) != 2 || |
95 | answer[0] != 'O' || answer[1] != 'K') { |
96 | D("cant' connect to %s service through qemud", name); |
97 | close(fd); |
98 | return -1; |
99 | } |
100 | } |
101 | return fd; |
102 | } |
103 | |
104 | static __inline__ int |
105 | qemud_channel_send(int fd, const void* msg, int msglen) |
106 | { |
107 | char header[5]; |
108 | |
109 | if (msglen < 0) |
110 | msglen = strlen((const char*)msg); |
111 | |
112 | if (msglen == 0) |
113 | return 0; |
114 | |
115 | snprintf(header, sizeof header, "%04x", msglen); |
116 | if (qemud_fd_write(fd, header, 4) != 4) { |
117 | D("can't write qemud frame header: %s", strerror(errno)); |
118 | return -1; |
119 | } |
120 | |
121 | if (qemud_fd_write(fd, msg, msglen) != msglen) { |
122 | D("can4t write qemud frame payload: %s", strerror(errno)); |
123 | return -1; |
124 | } |
125 | return 0; |
126 | } |
127 | |
128 | static __inline__ int |
129 | qemud_channel_recv(int fd, void* msg, int msgsize) |
130 | { |
131 | char header[5]; |
132 | int size, avail; |
133 | |
134 | if (qemud_fd_read(fd, header, 4) != 4) { |
135 | D("can't read qemud frame header: %s", strerror(errno)); |
136 | return -1; |
137 | } |
138 | header[4] = 0; |
139 | if (sscanf(header, "%04x", &size) != 1) { |
140 | D("malformed qemud frame header: '%.*s'", 4, header); |
141 | return -1; |
142 | } |
143 | if (size > msgsize) |
144 | return -1; |
145 | |
146 | if (qemud_fd_read(fd, msg, size) != size) { |
147 | D("can't read qemud frame payload: %s", strerror(errno)); |
148 | return -1; |
149 | } |
150 | return size; |
151 | } |
152 | |
153 | #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_H */ |
154 |