emulator: opengl: Use QEMU pipe.

This patch modifies the guest libraries to use the new
fast qemu "opengles" pipe to communicate with the host
renderer process.

Note that the renderer is still listening on a TCP socket
on port 22468.

Change-Id: I6ab84f972a8024e1fdababa4615d0650c8d461bf

Conflicts:

	tools/emulator/opengl/tests/gles_android_wrapper/Android.mk
	tools/emulator/opengl/tests/gles_android_wrapper/ServerConnection.h

tools/emulator/opengl/system/OpenglSystemCommon/QemuPipeStream.cpp

@@ -0,0 +1,184 @@
+/*
+* 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 "QemuPipeStream.h"
+#include <hardware/qemu_pipe.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+QemuPipeStream::QemuPipeStream(size_t bufSize) :
+    IOStream(bufSize),
+    m_sock(-1),
+    m_bufsize(bufSize),
+    m_buf(NULL)
+{
+}
+
+QemuPipeStream::QemuPipeStream(int sock, size_t bufSize) :
+    IOStream(bufSize),
+    m_sock(sock),
+    m_bufsize(bufSize),
+    m_buf(NULL)
+{
+}
+
+QemuPipeStream::~QemuPipeStream()
+{
+    if (m_sock >= 0) {
+        ::close(m_sock);
+    }
+    if (m_buf != NULL) {
+        free(m_buf);
+    }
+}
+
+
+int QemuPipeStream::connect(void)
+{
+    m_sock = qemu_pipe_open("opengles");
+    if (!valid()) return -1;
+    return 0;
+}
+
+void *QemuPipeStream::allocBuffer(size_t minSize)
+{
+    size_t allocSize = (m_bufsize < minSize ? minSize : m_bufsize);
+    if (!m_buf) {
+        m_buf = (unsigned char *)malloc(allocSize);
+    }
+    else if (m_bufsize < allocSize) {
+        unsigned char *p = (unsigned char *)realloc(m_buf, allocSize);
+        if (p != NULL) {
+            m_buf = p;
+            m_bufsize = allocSize;
+        } else {
+            ERR("realloc (%d) failed\n", allocSize);
+            free(m_buf);
+            m_buf = NULL;
+            m_bufsize = 0;
+        }
+    }
+
+    return m_buf;
+};
+
+int QemuPipeStream::commitBuffer(size_t size)
+{
+    return writeFully(m_buf, size);
+}
+
+int QemuPipeStream::writeFully(const void *buf, size_t len)
+{
+    if (!valid()) return -1;
+
+    size_t res = len;
+    int retval = 0;
+
+    while (res > 0) {
+        ssize_t stat = ::write(m_sock, (const char *)(buf) + (len - res), res);
+        if (stat > 0) {
+            res -= stat;
+            continue;
+        }
+        if (stat == 0) { /* EOF */
+            ERR("QemuPipeStream::writeFully failed: premature EOF\n");
+            retval = -1;
+            break;
+        }
+        if (errno == EINTR) {
+            continue;
+        }
+        retval =  stat;
+        ERR("QemuPipeStream::writeFully failed: %s\n", strerror(errno));
+        break;
+    }
+    return retval;
+}
+
+const unsigned char *QemuPipeStream::readFully(void *buf, size_t len)
+{
+    if (!valid()) return NULL;
+    if (!buf) {
+        ERR("QemuPipeStream::readFully failed, buf=NULL");
+        return NULL;  // do not allow NULL buf in that implementation
+    }
+    size_t res = len;
+    while (res > 0) {
+        ssize_t stat = ::read(m_sock, (char *)(buf) + len - res, len);
+        if (stat == 0) {
+            // client shutdown;
+            return NULL;
+        } else if (stat < 0) {
+            if (errno == EINTR) {
+                continue;
+            } else {
+                ERR("QemuPipeStream::readFully failed (buf %p): %s\n",
+                    buf, strerror(errno));
+                return NULL;
+            }
+        } else {
+            res -= stat;
+        }
+    }
+    return (const unsigned char *)buf;
+}
+
+const unsigned char *QemuPipeStream::read( void *buf, size_t *inout_len)
+{
+    if (!valid()) return NULL;
+    if (!buf) {
+      ERR("QemuPipeStream::read failed, buf=NULL");
+      return NULL;  // do not allow NULL buf in that implementation
+    }
+
+    int n = recv(buf, *inout_len);
+
+    if (n > 0) {
+        *inout_len = n;
+        return (const unsigned char *)buf;
+    }
+
+    return NULL;
+}
+
+int QemuPipeStream::recv(void *buf, size_t len)
+{
+    if (!valid()) return int(ERR_INVALID_SOCKET);
+    char* p = (char *)buf;
+    int ret = 0;
+    while(len > 0) {
+        int res = ::read(m_sock, p, len);
+        if (res > 0) {
+            p += res;
+            ret += res;
+            len -= res;
+            continue;
+        }
+        if (res == 0) { /* EOF */
+             break;
+        }
+        if (errno == EINTR)
+            continue;
+
+        /* A real error */
+        if (ret == 0)
+            ret = -1;
+        break;
+    }
+    return ret;
+}