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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 */ |