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author | bohu | 2017-03-29 14:19:40 -0500 |
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committer | bohu | 2017-03-29 14:19:40 -0500 |
commit | f66a7ee897ff8bc40ef1adb233178ba6ba83c0f7 (patch) | |
tree | 392a4fb1e5601a272f62c69a1d35364c40f8e413 /qemu_pipe | |
parent | 2abd426db566ce6f67022518cca474fabab51201 (diff) | |
download | platform-system-core-f66a7ee897ff8bc40ef1adb233178ba6ba83c0f7.tar.gz platform-system-core-f66a7ee897ff8bc40ef1adb233178ba6ba83c0f7.tar.xz platform-system-core-f66a7ee897ff8bc40ef1adb233178ba6ba83c0f7.zip |
Revert "Revert "Qemu-pipe: refactor qemu_pipe.h into libqemu_pipe""
This reverts commit 63ef9ff5fa4b1e68029a54bb60c97b99bdf5defc.
Diffstat (limited to 'qemu_pipe')
-rw-r--r-- | qemu_pipe/Android.mk | 19 | ||||
-rw-r--r-- | qemu_pipe/include/qemu_pipe.h | 62 | ||||
-rw-r--r-- | qemu_pipe/qemu_pipe.cpp | 132 |
3 files changed, 213 insertions, 0 deletions
diff --git a/qemu_pipe/Android.mk b/qemu_pipe/Android.mk new file mode 100644 index 000000000..6e0144ce1 --- /dev/null +++ b/qemu_pipe/Android.mk | |||
@@ -0,0 +1,19 @@ | |||
1 | # Copyright 2011 The Android Open Source Project | ||
2 | |||
3 | LOCAL_PATH:= $(call my-dir) | ||
4 | |||
5 | common_static_libraries := \ | ||
6 | libbase | ||
7 | include $(CLEAR_VARS) | ||
8 | LOCAL_CLANG := true | ||
9 | LOCAL_SANITIZE := integer | ||
10 | LOCAL_SRC_FILES:= \ | ||
11 | qemu_pipe.cpp | ||
12 | LOCAL_C_INCLUDES := \ | ||
13 | $(LOCAL_PATH)/include \ | ||
14 | system/base/include | ||
15 | LOCAL_MODULE:= libqemu_pipe | ||
16 | LOCAL_STATIC_LIBRARIES := $(common_static_libraries) | ||
17 | LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include | ||
18 | LOCAL_CFLAGS := -Werror | ||
19 | include $(BUILD_STATIC_LIBRARY) | ||
diff --git a/qemu_pipe/include/qemu_pipe.h b/qemu_pipe/include/qemu_pipe.h new file mode 100644 index 000000000..16486c087 --- /dev/null +++ b/qemu_pipe/include/qemu_pipe.h | |||
@@ -0,0 +1,62 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2011 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 | #ifndef ANDROID_CORE_INCLUDE_QEMU_PIPE_H | ||
17 | #define ANDROID_CORE_INCLUDE_QEMU_PIPE_H | ||
18 | |||
19 | #include <stddef.h> | ||
20 | |||
21 | #ifdef __cplusplus | ||
22 | extern "C" { | ||
23 | #endif | ||
24 | // Try to open a new Qemu fast-pipe. This function returns a file descriptor | ||
25 | // that can be used to communicate with a named service managed by the | ||
26 | // emulator. | ||
27 | // | ||
28 | // This file descriptor can be used as a standard pipe/socket descriptor. | ||
29 | // | ||
30 | // 'pipeName' is the name of the emulator service you want to connect to, | ||
31 | // and must begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles'). | ||
32 | // | ||
33 | // On success, return a valid file descriptor, or -1/errno on failure. E.g.: | ||
34 | // | ||
35 | // EINVAL -> unknown/unsupported pipeName | ||
36 | // ENOSYS -> fast pipes not available in this system. | ||
37 | // | ||
38 | // ENOSYS should never happen, except if you're trying to run within a | ||
39 | // misconfigured emulator. | ||
40 | // | ||
41 | // You should be able to open several pipes to the same pipe service, | ||
42 | // except for a few special cases (e.g. GSM modem), where EBUSY will be | ||
43 | // returned if more than one client tries to connect to it. | ||
44 | int qemu_pipe_open(const char* pipeName); | ||
45 | |||
46 | // Send a framed message |buff| of |len| bytes through the |fd| descriptor. | ||
47 | // This really adds a 4-hexchar prefix describing the payload size. | ||
48 | // Returns 0 on success, and -1 on error. | ||
49 | int qemu_pipe_frame_send(int fd, const void* buff, size_t len); | ||
50 | |||
51 | // Read a frame message from |fd|, and store it into |buff| of |len| bytes. | ||
52 | // If the framed message is larger than |len|, then this returns -1 and the | ||
53 | // content is lost. Otherwise, this returns the size of the message. NOTE: | ||
54 | // empty messages are possible in a framed wire protocol and do not mean | ||
55 | // end-of-stream. | ||
56 | int qemu_pipe_frame_recv(int fd, void* buff, size_t len); | ||
57 | |||
58 | #ifdef __cplusplus | ||
59 | } | ||
60 | #endif | ||
61 | |||
62 | #endif /* ANDROID_CORE_INCLUDE_QEMU_PIPE_H */ | ||
diff --git a/qemu_pipe/qemu_pipe.cpp b/qemu_pipe/qemu_pipe.cpp new file mode 100644 index 000000000..a4529deb8 --- /dev/null +++ b/qemu_pipe/qemu_pipe.cpp | |||
@@ -0,0 +1,132 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2011 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 "qemu_pipe.h" | ||
18 | |||
19 | #include <unistd.h> | ||
20 | #include <fcntl.h> | ||
21 | #include <string.h> | ||
22 | #include <errno.h> | ||
23 | #include <stdio.h> | ||
24 | |||
25 | |||
26 | // Define QEMU_PIPE_DEBUG if you want to print error messages when an error | ||
27 | // occurs during pipe operations. The macro should simply take a printf-style | ||
28 | // formatting string followed by optional arguments. | ||
29 | #ifndef QEMU_PIPE_DEBUG | ||
30 | # define QEMU_PIPE_DEBUG(...) (void)0 | ||
31 | #endif | ||
32 | |||
33 | // Try to open a new Qemu fast-pipe. This function returns a file descriptor | ||
34 | // that can be used to communicate with a named service managed by the | ||
35 | // emulator. | ||
36 | // | ||
37 | // This file descriptor can be used as a standard pipe/socket descriptor. | ||
38 | // | ||
39 | // 'pipeName' is the name of the emulator service you want to connect to, | ||
40 | // and must begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles'). | ||
41 | // | ||
42 | // On success, return a valid file descriptor, or -1/errno on failure. E.g.: | ||
43 | // | ||
44 | // EINVAL -> unknown/unsupported pipeName | ||
45 | // ENOSYS -> fast pipes not available in this system. | ||
46 | // | ||
47 | // ENOSYS should never happen, except if you're trying to run within a | ||
48 | // misconfigured emulator. | ||
49 | // | ||
50 | // You should be able to open several pipes to the same pipe service, | ||
51 | // except for a few special cases (e.g. GSM modem), where EBUSY will be | ||
52 | // returned if more than one client tries to connect to it. | ||
53 | int qemu_pipe_open(const char* pipeName) { | ||
54 | // Sanity check. | ||
55 | if (!pipeName || memcmp(pipeName, "pipe:", 5) != 0) { | ||
56 | errno = EINVAL; | ||
57 | return -1; | ||
58 | } | ||
59 | |||
60 | int fd = TEMP_FAILURE_RETRY(open("/dev/qemu_pipe", O_RDWR)); | ||
61 | if (fd < 0) { | ||
62 | QEMU_PIPE_DEBUG("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, | ||
63 | strerror(errno)); | ||
64 | return -1; | ||
65 | } | ||
66 | |||
67 | // Write the pipe name, *including* the trailing zero which is necessary. | ||
68 | size_t pipeNameLen = strlen(pipeName); | ||
69 | ssize_t ret = TEMP_FAILURE_RETRY(write(fd, pipeName, pipeNameLen + 1U)); | ||
70 | if (ret != (ssize_t)pipeNameLen + 1) { | ||
71 | QEMU_PIPE_DEBUG("%s: Could not connect to %s pipe service: %s", | ||
72 | __FUNCTION__, pipeName, strerror(errno)); | ||
73 | if (ret == 0) { | ||
74 | errno = ECONNRESET; | ||
75 | } else if (ret > 0) { | ||
76 | errno = EINVAL; | ||
77 | } | ||
78 | return -1; | ||
79 | } | ||
80 | return fd; | ||
81 | } | ||
82 | |||
83 | // Send a framed message |buff| of |len| bytes through the |fd| descriptor. | ||
84 | // This really adds a 4-hexchar prefix describing the payload size. | ||
85 | // Returns 0 on success, and -1 on error. | ||
86 | int qemu_pipe_frame_send(int fd, const void* buff, size_t len) { | ||
87 | char header[5]; | ||
88 | snprintf(header, sizeof(header), "%04zx", len); | ||
89 | ssize_t ret = TEMP_FAILURE_RETRY(write(fd, header, 4)); | ||
90 | if (ret != 4) { | ||
91 | QEMU_PIPE_DEBUG("Can't write qemud frame header: %s", strerror(errno)); | ||
92 | return -1; | ||
93 | } | ||
94 | ret = TEMP_FAILURE_RETRY(write(fd, buff, len)); | ||
95 | if (ret != (ssize_t)len) { | ||
96 | QEMU_PIPE_DEBUG("Can't write qemud frame payload: %s", strerror(errno)); | ||
97 | return -1; | ||
98 | } | ||
99 | return 0; | ||
100 | } | ||
101 | |||
102 | // Read a frame message from |fd|, and store it into |buff| of |len| bytes. | ||
103 | // If the framed message is larger than |len|, then this returns -1 and the | ||
104 | // content is lost. Otherwise, this returns the size of the message. NOTE: | ||
105 | // empty messages are possible in a framed wire protocol and do not mean | ||
106 | // end-of-stream. | ||
107 | int qemu_pipe_frame_recv(int fd, void* buff, size_t len) { | ||
108 | char header[5]; | ||
109 | ssize_t ret = TEMP_FAILURE_RETRY(read(fd, header, 4)); | ||
110 | if (ret != 4) { | ||
111 | QEMU_PIPE_DEBUG("Can't read qemud frame header: %s", strerror(errno)); | ||
112 | return -1; | ||
113 | } | ||
114 | header[4] = '\0'; | ||
115 | size_t size; | ||
116 | if (sscanf(header, "%04zx", &size) != 1) { | ||
117 | QEMU_PIPE_DEBUG("Malformed qemud frame header: [%.*s]", 4, header); | ||
118 | return -1; | ||
119 | } | ||
120 | if (size > len) { | ||
121 | QEMU_PIPE_DEBUG("Oversized qemud frame (% bytes, expected <= %)", size, | ||
122 | len); | ||
123 | return -1; | ||
124 | } | ||
125 | ret = TEMP_FAILURE_RETRY(read(fd, buff, size)); | ||
126 | if (ret != (ssize_t)size) { | ||
127 | QEMU_PIPE_DEBUG("Could not read qemud frame payload: %s", | ||
128 | strerror(errno)); | ||
129 | return -1; | ||
130 | } | ||
131 | return size; | ||
132 | } | ||