upload android base code part6

android/device/generic/goldfish-opengl/system/OpenglSystemCommon/qemu_pipe.h

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+/*
+ * 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_INCLUDE_HARDWARE_QEMU_PIPE_H
+#define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
+
+#include <sys/cdefs.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <pthread.h>  /* for pthread_once() */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#ifndef D
+#  define  D(...)   do{}while(0)
+#endif
+
+static bool WriteFully(int fd, const void* data, size_t byte_count) {
+  const uint8_t* p = (const uint8_t*)(data);
+  size_t remaining = byte_count;
+  while (remaining > 0) {
+    ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, remaining));
+    if (n == -1) return false;
+    p += n;
+    remaining -= n;
+  }
+  return true;
+}
+
+/* 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.
+ * E.g. 'opengles' or 'camera'.
+ *
+ * On success, return a valid file descriptor
+ * Returns -1 on error, and errno gives the error code, 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.
+ */
+static __inline__ int
+qemu_pipe_open(const char*  pipeName)
+{
+    char  buff[256];
+    int   buffLen;
+    int   fd, ret;
+
+    if (pipeName == NULL || pipeName[0] == '\0') {
+        errno = EINVAL;
+        return -1;
+    }
+
+    snprintf(buff, sizeof buff, "pipe:%s", pipeName);
+
+    fd = TEMP_FAILURE_RETRY(open("/dev/qemu_pipe", O_RDWR));
+    if (fd < 0 && errno == ENOENT)
+        fd = TEMP_FAILURE_RETRY(open("/dev/goldfish_pipe", O_RDWR));
+    if (fd < 0) {
+        D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
+        //errno = ENOSYS;
+        return -1;
+    }
+
+    buffLen = strlen(buff);
+
+    if (!WriteFully(fd, buff, buffLen + 1)) {
+        D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
+        return -1;
+    }
+
+    return fd;
+}
+
+#endif /* ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H */