Merge "Move the qemu_pipe library into vhal_v2_0" am: de2b8f248e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1670545

Change-Id: I7e92dee35f6e2779bb244d7f2ef7106253bfc819

automotive/vehicle/2.0/default/Android.bp

@@ -91,13 +91,13 @@ cc_library_static {
         "impl/vhal_v2_0/LinearFakeValueGenerator.cpp",
         "impl/vhal_v2_0/JsonFakeValueGenerator.cpp",
         "impl/vhal_v2_0/GeneratorHub.cpp",
+        "impl/vhal_v2_0/qemu_pipe.cpp",
     ],
     local_include_dirs: ["common/include/vhal_v2_0"],
     export_include_dirs: ["impl"],
     whole_static_libs: [
         "android.hardware.automotive.vehicle@2.0-emulated-user-hal-lib",
         "android.hardware.automotive.vehicle@2.0-manager-lib",
-        "libqemu_pipe",
     ],
     shared_libs: [
         "libbase",

automotive/vehicle/2.0/default/impl/vhal_v2_0/PipeComm.cpp

@@ -18,9 +18,9 @@
 
 #include <android/hardware/automotive/vehicle/2.0/IVehicle.h>
 #include <log/log.h>
-#include <qemu_pipe.h>
 
 #include "PipeComm.h"
+#include "qemu_pipe.h"
 
 #define CAR_SERVICE_NAME "pipe:qemud:car"
 

automotive/vehicle/2.0/default/impl/vhal_v2_0/qemu_pipe.cpp

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "qemu_pipe.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <android-base/file.h>
+
+using android::base::ReadFully;
+using android::base::WriteFully;
+
+// Define QEMU_PIPE_DEBUG if you want to print error messages when an error
+// occurs during pipe operations. The macro should simply take a printf-style
+// formatting string followed by optional arguments.
+#ifndef QEMU_PIPE_DEBUG
+#define QEMU_PIPE_DEBUG(...) (void)0
+#endif
+
+int qemu_pipe_open(const char* pipeName) {
+    if (!pipeName) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    int fd = TEMP_FAILURE_RETRY(open("/dev/qemu_pipe", O_RDWR));
+    if (fd < 0) {
+        QEMU_PIPE_DEBUG("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
+        return -1;
+    }
+
+    // Write the pipe name, *including* the trailing zero which is necessary.
+    size_t pipeNameLen = strlen(pipeName);
+    if (WriteFully(fd, pipeName, pipeNameLen + 1U)) {
+        return fd;
+    }
+
+    // now, add 'pipe:' prefix and try again
+    // Note: host side will wait for the trailing '\0' to start
+    // service lookup.
+    const char pipe_prefix[] = "pipe:";
+    if (WriteFully(fd, pipe_prefix, strlen(pipe_prefix)) &&
+        WriteFully(fd, pipeName, pipeNameLen + 1U)) {
+        return fd;
+    }
+    QEMU_PIPE_DEBUG("%s: Could not write to %s pipe service: %s", __FUNCTION__, pipeName,
+                    strerror(errno));
+    close(fd);
+    return -1;
+}
+
+int qemu_pipe_frame_send(int fd, const void* buff, size_t len) {
+    char header[5];
+    snprintf(header, sizeof(header), "%04zx", len);
+    if (!WriteFully(fd, header, 4)) {
+        QEMU_PIPE_DEBUG("Can't write qemud frame header: %s", strerror(errno));
+        return -1;
+    }
+    if (!WriteFully(fd, buff, len)) {
+        QEMU_PIPE_DEBUG("Can't write qemud frame payload: %s", strerror(errno));
+        return -1;
+    }
+    return 0;
+}
+
+int qemu_pipe_frame_recv(int fd, void* buff, size_t len) {
+    char header[5];
+    if (!ReadFully(fd, header, 4)) {
+        QEMU_PIPE_DEBUG("Can't read qemud frame header: %s", strerror(errno));
+        return -1;
+    }
+    header[4] = '\0';
+    size_t size;
+    if (sscanf(header, "%04zx", &size) != 1) {
+        QEMU_PIPE_DEBUG("Malformed qemud frame header: [%.*s]", 4, header);
+        return -1;
+    }
+    if (size > len) {
+        QEMU_PIPE_DEBUG("Oversized qemud frame (% bytes, expected <= %)", size, len);
+        return -1;
+    }
+    if (!ReadFully(fd, buff, size)) {
+        QEMU_PIPE_DEBUG("Could not read qemud frame payload: %s", strerror(errno));
+        return -1;
+    }
+    return size;
+}

automotive/vehicle/2.0/default/impl/vhal_v2_0/qemu_pipe.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ANDROID_CORE_INCLUDE_QEMU_PIPE_H
+#define ANDROID_CORE_INCLUDE_QEMU_PIPE_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+// Try to open a new Qemu fast-pipe. This function returns a file descriptor
+// that can be used to communicate with a named service managed by the
+// emulator.
+//
+// This file descriptor can be used as a standard pipe/socket descriptor.
+//
+// 'pipeName' is the name of the emulator service you want to connect to,
+// and should begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles').
+// For backward compatibility, the 'pipe:' prefix can be omitted, and in
+// that case, qemu_pipe_open will add it for you.
+
+// On success, return a valid file descriptor, or -1/errno on failure. E.g.:
+//
+// EINVAL  -> unknown/unsupported pipeName
+// ENOSYS  -> fast pipes not available in this system.
+//
+// ENOSYS should never happen, except if you're trying to run within a
+// misconfigured emulator.
+//
+// You should be able to open several pipes to the same pipe service,
+// except for a few special cases (e.g. GSM modem), where EBUSY will be
+// returned if more than one client tries to connect to it.
+int qemu_pipe_open(const char* pipeName);
+
+// Send a framed message |buff| of |len| bytes through the |fd| descriptor.
+// This really adds a 4-hexchar prefix describing the payload size.
+// Returns 0 on success, and -1 on error.
+int qemu_pipe_frame_send(int fd, const void* buff, size_t len);
+
+// Read a frame message from |fd|, and store it into |buff| of |len| bytes.
+// If the framed message is larger than |len|, then this returns -1 and the
+// content is lost. Otherwise, this returns the size of the message. NOTE:
+// empty messages are possible in a framed wire protocol and do not mean
+// end-of-stream.
+int qemu_pipe_frame_recv(int fd, void* buff, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ANDROID_CORE_INCLUDE_QEMU_PIPE_H */