Move emugl system code to development.git

Because of the way the SDK and Android system images are branched,
host code that goes into the SDK tools can't live in the same
repository as code that goes into the system image. This change keeps
the emugl host code in sdk.git/emulator/opengl while moving the emugl
system code to development.git/tools/emulator/opengl.

A few changes were made beyond simply cloning the directories:

(a) Makefiles were modified to only build the relevant components. Not
    doing so would break the build due to having multiple rule
    definitions.

(b) Protocol spec files were moved from the guest encoder directories
    to the host decoder directories. The decoder must support older
    versions of the protocol, but not newer versions, so it makes
    sense to keep the latest version of the protocol spec with the
    decoder.

(c) Along with that, the encoder is now built from checked in
    generated encoder source rather than directly from the protocol
    spec.  The generated code must be updated manually. This makes it
    possible to freeze the system encoder version without freezing the
    host decoder version, and also makes it very obvious when a
    protocol changes is happening that will require special
    backwards-compatibility support in the decoder/renderer.

(d) Host-only and system-only code were removed from the repository
    where they aren't used.

(e) README and DESIGN documents were updated to reflect this split.

No actual source code was changed due to the above.

Change-Id: I2c936101ea0405b372750d36ba0f01e84d719c43

tools/emulator/opengl/shared/OpenglOsUtils/osProcessUnix.cpp

@@ -0,0 +1,210 @@
+/*
+* 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 "osProcess.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <poll.h>
+#include <pthread.h>
+#include <string.h>
+#include <pwd.h>
+#include <paths.h>
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <assert.h>
+
+namespace osUtils {
+
+//
+// buildArgList converts a command line into null terminated argument list.
+// to be used with execv or execvp.
+// each argument is seperated by space or tab, to specify multiple words
+// at the same argument place it inside single-quoted or double-quoted string.
+//
+static char **buildArgList(const char *command)
+{
+    char **argv = NULL;
+    int argvSize = 0;
+    int nArgs = 0;
+    char *tmpcmd = strdup(command);
+    char *t = tmpcmd;
+    char *strStart = NULL;
+    int i = 0;
+
+    #define ADD_ARG \
+        { \
+            nArgs++; \
+            if (!argv) { \
+                argvSize = 12; \
+                argv = (char **)malloc(argvSize * sizeof(char *)); \
+            } \
+            else if (nArgs > argvSize) { \
+                argvSize += 12; \
+                argv = (char **)realloc(argv, argvSize * sizeof(char *)); \
+            } \
+            argv[nArgs-1] = t; \
+            t = NULL; \
+        }
+
+    while( tmpcmd[i] != '\0' ) {
+        if (!strStart) {
+            if (tmpcmd[i] == '"' || tmpcmd[i] == '\'') {
+                strStart = &tmpcmd[i];
+            }
+            else if (tmpcmd[i] == ' ' || tmpcmd[i] == '\t') {
+                tmpcmd[i] = '\0';
+                if (t) ADD_ARG;
+            }
+            else if (!t) {
+                t = &tmpcmd[i];
+            }
+        }
+        else if (tmpcmd[i] == *strStart) {
+            t = strStart;
+            strStart = NULL;
+        }
+
+        i++;
+    }
+    if (t) {
+        ADD_ARG;
+    }
+    if (nArgs > 0) {
+        ADD_ARG; // for NULL terminating list
+    }
+
+    return argv;
+}
+
+static pid_t start_process(const char *command,const char *startDir)
+{
+    pid_t pid;
+
+    pid = fork();
+
+    if (pid < 0) {
+        return pid;
+    }
+    else if (pid == 0) {
+        //
+        // Close all opened file descriptors
+        //
+        for (int i=3; i<256; i++) {
+            close(i);
+        }
+
+        if (startDir) {
+            chdir(startDir);
+        }
+
+        char **argv = buildArgList(command);
+        if (!argv) {
+            return -1;
+        }
+        execvp(argv[0], argv);
+
+        perror("execl");
+        exit(-101);
+    }
+
+    return pid;
+}
+
+childProcess *
+childProcess::create(const char *p_cmdLine, const char *p_startdir)
+{
+    childProcess *child = new childProcess();
+    if (!child) {
+        return NULL;
+    }
+
+    child->m_pid = start_process(p_cmdLine, p_startdir);
+    if (child->m_pid < 0) {
+        delete child;
+        return NULL;
+    }
+
+    return child;
+}
+
+childProcess::~childProcess()
+{
+}
+
+bool
+childProcess::wait(int *exitStatus)
+{
+    int ret=0;
+    if (m_pid>0) {
+        pid_t pid = waitpid(m_pid,&ret,0);
+        if (pid != -1) {
+            m_pid=-1;
+            if (exitStatus) {
+                *exitStatus = ret;
+            }
+            return true;
+        }
+    }
+    return false;
+}
+
+int
+childProcess::tryWait(bool &isAlive)
+{
+    int ret=0;
+    isAlive = false;
+    if (m_pid>0) {
+        pid_t pid = waitpid(m_pid,&ret,WNOHANG);
+        if (pid == 0) {
+            isAlive = true;
+        }
+    }
+
+    return ((char)WEXITSTATUS(ret));
+}
+
+int ProcessGetPID()
+{
+    return getpid();
+}
+
+int KillProcess(int pid, bool wait)
+{
+    if (pid<1) {
+        return false;
+    }
+
+    if (0!=kill(pid,SIGTERM)) {
+        return false;
+    }
+
+    if (wait) {
+        if (waitpid(pid,NULL,0)<0) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool isProcessRunning(int pid)
+{
+    return (kill(pid,0) == 0);
+}
+
+} // of namespace osUtils