详细分析Android中实现Zygote的源码

char* result = strdup(className); for (char* cp = result; *cp != ''; cp ++) {

if (*cp == '.') { *cp = '/';

} }

return result;

}

/** * Start the Android runtime. This involves starting the virtual machine

* and calling the "static void main(String[] args)" method int the class * named by "className".

* * 这两个参数的值分别为:

* const char* className = "com.android.internal.os.ZygoteInit"; * const char* options = "start-system-server";

*/ void AndroidRuntime::start(const char* className, const char* options)

{ ALOGD("n>>>>> AndroidRuntime START %s <<<<<<n",

className != NULL ? className : "(unknown)");

/** * 'startSystemServer == true' means runtime is obsolete and not run from

* init.rc anymore, so we print out the boot start event here. */

if (strcmp(options, "start-system-server") == 0) { const int LOG_BOOT_PROGRESS_START = 3000;

LOG_EVENT_LONG(LOG_BOOT_PROGRESS_START, ns2ms(systemTime(SYSTEM_TIME_MONOTONIC))); }

// 设置ANDROID_ROOT环境变量

const char* rootDir = getenv("ANDROID_ROOT"); if (rootDir == NULL) {

rootDir = "/system"; if (!hasDir("/system")) {

LOG_FATAL("No root directory specified, and /android dose not exist."); return;

} setenv("ANDROID_ROOT", rootDir, 1);

}

JniInvocation jni_invocation;

jni_invocation.Init(NULL); JNIEnv* env;