extract kernel module, depends on core and provides kernel service(no stream)

@@ -121,7 +121,7 @@ fi
 #####################################################################################
 # Modules, compile each module, then link to binary
 #
-#Core Module
+#Core, depends only on system apis.
 MODULE_ID="CORE" 
 MODULE_DEPENDS=() 
 ModuleLibIncs=(${SRS_OBJS})
@@ -129,12 +129,20 @@ MODULE_FILES=("srs_core" "srs_core_autofree")
 MODULE_DIR="src/core" . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 #
+#Kernel, depends on core, provides error/log/config, nothing about stream information.
+MODULE_ID="KERNEL" 
+MODULE_DEPENDS=("CORE") 
+ModuleLibIncs=(${SRS_OBJS})
+MODULE_FILES=("srs_kernel_error")
+MODULE_DIR="src/kernel" . auto/modules.sh
+KERNEL_OBJS="${MODULE_OBJS[@]}"
+#
 #App Module
 MODULE_ID="APP" 
-MODULE_DEPENDS=("CORE") 
+MODULE_DEPENDS=("CORE" "KERNEL") 
 ModuleLibIncs=(${LibSTRoot} ${LibHttpParserRoot} ${LibSSLRoot} ${SRS_OBJS})
 MODULE_FILES=("srs_core_log" "srs_core_server" 
-        "srs_core_error" "srs_core_conn" "srs_core_client" 
+         "srs_core_conn" "srs_core_client" 
         "srs_core_rtmp" "srs_core_socket" "srs_core_buffer"
         "srs_core_protocol" "srs_core_amf0"
         "srs_core_stream" "srs_core_source" "srs_core_codec"
@@ -148,7 +156,7 @@ APP_OBJS="${MODULE_OBJS[@]}"
 #
 #Main Module
 MODULE_ID="MAIN" 
-MODULE_DEPENDS=("CORE" "APP")
+MODULE_DEPENDS=("CORE" "KERNEL" "APP")
 ModuleLibIncs=(${LibSTRoot} ${SRS_OBJS})
 MODULE_FILES=("srs_main_server" "srs_main_bandcheck")
 MODULE_DIR="src/main" . auto/modules.sh
@@ -164,7 +172,7 @@ MAIN_ENTRANCES=("srs_main_server" "srs_main_bandcheck")
 # all depends libraries
 ModuleLibFiles=(${LibSTfile} ${LibHttpParserfile} ${LibSSLfile})
 # all depends objects
-MODULE_OBJS="${CORE_OBJS[@]} ${APP_OBJS[@]} ${MAIN_OBJS[@]}"
+MODULE_OBJS="${CORE_OBJS[@]} ${KERNEL_OBJS[@]} ${APP_OBJS[@]} ${MAIN_OBJS[@]}"
 LINK_OPTIONS="-ldl"
 #
 # srs:

@@ -26,7 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <utility>
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_stream.hpp>
 
 // AMF0 marker

@@ -29,7 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 using namespace std;
 
 #include <srs_core_rtmp.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_amf0.hpp>
 #include <srs_core_protocol.hpp>
 #include <srs_core_config.hpp>

@@ -23,7 +23,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_buffer.hpp>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_socket.hpp>
 #include <srs_core_log.hpp>
 

@@ -28,7 +28,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 using namespace std;
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_rtmp.hpp>
 #include <srs_core_protocol.hpp>

@@ -26,7 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <string.h>
 #include <stdlib.h>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_stream.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_autofree.hpp>

@@ -37,7 +37,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <algorithm>
 using namespace std;
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_autofree.hpp>
 

@@ -24,7 +24,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_conn.hpp>
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_server.hpp>
 
 SrsConnection::SrsConnection(SrsServer* srs_server, st_netfd_t client_stfd)

@@ -32,7 +32,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <algorithm>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_config.hpp>
 #include <srs_core_rtmp.hpp>

@@ -28,7 +28,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_rtmp.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_protocol.hpp>

@@ -26,7 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <time.h>
 #include <stdlib.h>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_autofree.hpp>
 #include <srs_core_socket.hpp>

@@ -33,7 +33,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <algorithm>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_codec.hpp>
 #include <srs_core_amf0.hpp>
 #include <srs_core_protocol.hpp>

@@ -32,7 +32,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_rtmp.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_socket.hpp>

@@ -29,7 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_log.hpp>
 #include <srs_core_config.hpp>
 #include <srs_core_reload.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 #define SRS_STAGE_DEFAULT_INTERVAL_MS 1200
 

@@ -25,7 +25,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_log.hpp>
 #include <srs_core_amf0.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_socket.hpp>
 #include <srs_core_buffer.hpp>
 #include <srs_core_stream.hpp>

@@ -35,7 +35,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_st.hpp>
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 // the following is the timeout for rtmp protocol, 
 // to avoid death connection.

@@ -23,7 +23,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_refer.hpp>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_config.hpp>
 

@@ -25,7 +25,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 using namespace std;
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 ISrsReloadHandler::ISrsReloadHandler()
 {

@@ -24,7 +24,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_rtmp.hpp>
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_socket.hpp>
 #include <srs_core_protocol.hpp>
 #include <srs_core_autofree.hpp>

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <algorithm>
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_client.hpp>
 #include <srs_core_config.hpp>
 

@@ -23,7 +23,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_socket.hpp>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 SrsSocket::SrsSocket(st_netfd_t client_stfd)
 {

@@ -24,7 +24,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_stream.hpp>
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 SrsStream::SrsStream()
 {

@@ -23,7 +23,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_thread.hpp>
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_log.hpp>
 
 ISrsThreadHandler::ISrsThreadHandler()

@@ -21,7 +21,7 @@ IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 
 bool srs_is_system_control_error(int error_code)
 {

@@ -21,11 +21,11 @@ IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
-#ifndef SRS_CORE_ERROR_HPP
-#define SRS_CORE_ERROR_HPP
+#ifndef SRS_KERNEL_ERROR_HPP
+#define SRS_KERNEL_ERROR_HPP
 
 /*
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 */
 
 #include <srs_core.hpp>

@@ -30,7 +30,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_rtmp.hpp>
 #include <srs_core_protocol.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_amf0.hpp>
 #include <srs_core_autofree.hpp>
 #include <srs_core_stream.hpp>

@@ -22,7 +22,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #include <srs_core_log.hpp>
-#include <srs_core_error.hpp>
+#include <srs_kernel_error.hpp>
 #include <srs_core_server.hpp>
 #include <srs_core_config.hpp>
 

@@ -9,6 +9,9 @@ file
     ..\core\srs_core.cpp,
     ..\core\srs_core_autofree.hpp,
     ..\core\srs_core_autofree.cpp,
+    kernel readonly separator,
+    ..\kernel\srs_kernel_error.hpp,
+    ..\kernel\srs_kernel_error.cpp,
     app readonly separator,
     ..\app\srs_core_amf0.hpp,
     ..\app\srs_core_amf0.cpp,
@@ -26,8 +29,6 @@ file
     ..\app\srs_core_conn.cpp,
     ..\app\srs_core_encoder.hpp,
     ..\app\srs_core_encoder.cpp,
-    ..\app\srs_core_error.hpp,
-    ..\app\srs_core_error.cpp,
     ..\app\srs_core_forward.hpp,
     ..\app\srs_core_forward.cpp,
     ..\app\srs_core_handshake.hpp,