DistRen Changeset - da79b5082151 · protofusion repositories

Changeset - da79b5082151

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Nathan Brink (binki) - 15 years ago 2010-07-23 00:43:32
ohnobinki@ohnopublishing.net

Extend the distren CLI a little bit more and specify some more of the protocol so that the client can be further worked on while cleaning up nonfunctional distrend.

11 files changed with 429 insertions and 109 deletions:

Makefile.am

doc/architecture.txt

src/client/distren.c

src/client/distren.h

src/client/libdistren.c

src/client/libdistren.h

src/client/libdistren_request.c

144

src/common/protocol.c

src/common/protocol.h

151

src/server/distrend.c

src/server/slavefuncs.c

0 comments (0 inline, 0 general)

Makefile.am

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@@ @@ -35,7 +35,8 @@ libdistrencommon_la_LDFLAGS = $(AM_LDFLA @@
 libdistren_la_SOURCES = \
 	src/client/libdistren.c src/client/libdistren.h \
 	src/client/libdistren_config.c \
 	src/client/libdistren_job.c
 	src/client/libdistren_job.c \
 	src/client/libdistren_request.c
 libdistren_la_LIBADD = libdistrencommon.la
 #CLI client.

doc/architecture.txt

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@@ @@ -36,7 +36,7 @@ Concepts: @@
       numeric value of a frame identification value must be unique to that job. There are no
       restrictions of ordering of frame numbers except that they are not to be negative. There
       need be no sequencing of frame numbers either. Thus, a frame identification URL would look
       like distren://<servername>/<jobid>/<frameid>
+      like distren://<servername>/<jobid>/frame/<frameid>
   - size: A frame hopefully represents a smaller unit of work in terms of the rendering
       back-end's capabilities. For example, POV-Ray's CLI can initiate and carry out the rendering
       of an entire animation. But distren would hopefully be able to provide a clean method for
@@ @@ -56,3 +56,9 @@ Concepts: @@
       jobs registered in a server.
   - servers: A server, though having many more functions, shall be able to also perform the list
       of actions a client may perform.
 - file: There are different uses of files above and distributed rendering requires file distribution.
   - file identification: Every file mentioned above was at least in the context of a job. Thus,
       file identification numbers shall be assigned in the context of a job identification number.
       They shall, however, be numeric.
       distren://<servername>/<jobid>/file/<fileid>

src/client/distren.c

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@@ @@ -150,7 +150,7 @@ int main(int argc, char *argv[]) @@
       lazy = 0;
+    }
-  if(distren_init_mf(&distren, &malloc, &free))
+  if(distren_init(&distren))
+    {
       fprintf(stderr, "error initializing the distren handle\n");
       return 1;

src/client/distren.h

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@@ @@ -28,20 +28,10 @@ @@
 typedef struct distren *distren_t;
 typedef void* (*distren_malloc_t)(size_t);
 typedef void (*distren_free_t)(void*);
 typedef struct distren_job *distren_job_t;
 /**
  Initialize a libdistren handle. In the spirit of respecting client programs' choices,
  this initialization function allows malloc() and free() compatible function pointers
  to be passed.
 */
 int distren_init_mf(distren_t *handle, distren_malloc_t mymalloc, distren_free_t myfree);
 /**
  Initializes a libdistren handle using the system malloc() and free() implementation.
  * Initializes a libdistren handle.
 */
 int distren_init(distren_t *handle);
@@ @@ -78,7 +68,7 @@ int distren_job_retrieve_file(distren_jo @@
 int distren_job_free(distren_job_t job);
 /**
  Destroys and frees a libdistren handle
+ * Destroys and frees a libdistren handle
 */
 int distren_free(distren_t handle);

src/client/libdistren.c

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@@ @@ -22,31 +22,27 @@ @@
  */
 #include "common/config.h"
 #include "common/options.h"
 #include "common/remoteio.h"
 #include "libdistren.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 /**
    @todo needs to read configuration in
  */
 int distren_init_mf(distren_t *handle, distren_malloc_t mymalloc, distren_free_t myfree)
 int distren_init(distren_t *handle)
+{
   if(!handle
      || !mymalloc
      || !myfree)
+    {
       fprintf(stderr, "distren_init_mf passed NULL pointers\n");
   int tmp;
   if(!handle)
       return 1;
+    }
-  *handle = (*mymalloc)(sizeof(struct distren));
+  *handle = malloc(sizeof(struct distren));
   if(!*handle)
     return 1;
   (*handle)->malloc = mymalloc;
   (*handle)->free = myfree;
   memset(*handle, 0, sizeof(struct distren));
   /* now the environment is ready for general use */
   if(_distren_getoptions(*handle))
@@ @@ -56,32 +52,40 @@ int distren_init_mf(distren_t *handle, d @@
       return 1;
+    }
   /**
      @todo open a connection to the server now and return error if we can't
      connect.
    */
   tmp = remoteio_open_server(&(*handle)->rem,
 			     (*handle)->options->remoteio,
 			     (remoteio_read_handle_func_t)&libdistren_remoteio_read_handle,
 			     *handle,
 			     (remoteio_close_handle_func_t)&libdistren_remoteio_close_handle,
 			     (*handle)->server);
   if(tmp)
+    {
       fprintf(stderr, "error: unable to connect to server\n");
       (*handle)->rem = NULL;
       distren_free(*handle);
       return 1;
+    }
   multiio_poll((*handle)->multiio, 2000);
   multiio_poll((*handle)->multiio, 2000);
   multiio_poll((*handle)->multiio, 2000);
   return 0;
+}
 int distren_init(distren_t *handle)
+{
   return distren_init_mf(handle, &malloc, &free);
+}
 /**
-   @todo Stub
+ * @todo Stub
  */
 int distren_submit_file(distren_t handle, distren_job_t *job, const char *filename)
+{
   return 1;
+}
 /**
  */
 int distren_free(distren_t handle)
+{
   if(handle->rem)
     remoteio_close(handle->rem);
   free(handle);
   return 0;
+}

src/client/libdistren.h

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@@ @@ -27,20 +27,29 @@ @@
 #include "distren.h"
 #include "common/multiio.h"
 #include "common/options.h"
 #include "common/remoteio.h"
 struct distren
+{
   distren_malloc_t malloc;
   distren_free_t free;
   struct options_common *options; /*< use a pointer just to avoid #include "options.h"? */
   struct options_common *options;
   char *server;
   /* if rem is NULL, we're not connected to the server */
   struct remoteio *rem;
   /*
    * for libdistren_remoteio_read_handle(): determine whether or not
    * we've passed through the server's hacky MOTD
    */
   short done_ad;
   /* something on which to call multiio_poll() ;-) */
   multiio_context_t multiio;
 };
 struct distren_job
+{
-  char *jobid;
+  char *joburi;
 };
 /*
@@ @@ -81,5 +90,19 @@ int _distren_getoptions(distren_t handle @@
  */
 int _distren_loseoptions(distren_t handle);
 /**
  * Handle newly read data.
+ *
  * Matches remoteio_read_handle_func_t
  */
 size_t libdistren_remoteio_read_handle(struct remoteio *rem, void *garbage, void *buf, size_t len, distren_t distren);
 /**
  * React to a remoteio-based connection closing.
+ *
  * Matches remoteio_close_handle_func_t
  */
 void libdistren_remoteio_close_handle(void *garbage, distren_t distren);
 #endif

src/client/libdistren_request.c

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@@ new file 100644 @@
 /*
  * Copyright 2010 Nathan Phillip Brink
+ *
  * This file is a part of DistRen.
+ *
  * DistRen is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
+ *
  * DistRen is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Affero General Public License for more details.
+ *
  * You should have received a copy of the GNU Affero General Public License
  * along with DistRen.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "common/config.h"
 #include "libdistren.h"
 #include "common/protocol.h"
 #include "common/remoteio.h"
 #include "common/request.h"
 static void handle_ping(struct remoteio *rem, struct distren_request *req, void *req_data);
 static void handle_version(struct remoteio *rem, struct distren_request *req, void *req_data);
 static void handle_disconnect(distren_t distren, struct remoteio *rem, struct distren_request *req, void *req_data);
 size_t libdistren_remoteio_read_handle(struct remoteio *rem, void *garbage, void *buf, size_t len, distren_t distren)
+{
   size_t to_return;
   size_t last_len;
   short err;
   struct distren_request *req;
   void *req_data;
   to_return = 0;
   while(!distren->done_ad)
+    {
       if(!len)
 	return to_return;
       putchar(*(char *)buf);
       if(*(char *)buf == '\n')
 	distren->done_ad = 1;
       len --;
       to_return ++;
       buf ++;
+    }
   /* hack to get into the loop at all ;-) */
   last_len = 1;
   while(last_len)
+    {
       last_len = distren_request_handle(NULL, buf, len, &req, &req_data, &err);
       if(err)
+	{
 	  remoteio_close(rem);
 	  return to_return;
+	}
       if(!last_len)
 	return to_return;
       switch((enum distren_request_type)req->type)
+	{
 	case DISTREN_REQUEST_PING:
 	  handle_ping(rem, req, req_data);
 	  break;
 	case DISTREN_REQUEST_VERSION:
 	  handle_version(rem, req, req_data);
 	  break;
 	case DISTREN_REQUEST_DISCONNECT:
 	  handle_disconnect(distren, rem, req, req_data);
 	  break;
 	default:
 	  /*
 	   * we don't implement everything because we don't need to do
 	   * so. But, we should complain when we get something we
 	   * don't recognize because... server protocols change
 	   * ;-). Oh, and when I'm first writing this, this
 	   * block will be hit a lot ;-).
 	   */
 	  fprintf(stderr, "Unrecognized request type: %lu\n", (unsigned long)req->type);
 	  break;
+	}
       distren_request_free(req);
       buf += last_len;
       len -= last_len;
+    }
   return to_return;
+}
 void libdistren_remoteio_close_handle(void *garbage, distren_t distren)
+{
   distren->rem = NULL;
+}
 /* handlers */
 static void handle_ping(struct remoteio *rem, struct distren_request *req, void *req_data)
+{
   struct distren_request *pong_req;
   void *pong_req_data;
   distren_request_poing(&pong_req, &pong_req_data, 0, req_data, req->len);
   distren_request_send(rem, pong_req, pong_req_data);
   distren_request_free_with_data(pong_req, pong_req_data);
+}
 static void handle_version(struct remoteio *rem, struct distren_request *req, void *req_data)
+{
   static const char *package_string = PACKAGE_STRING;
   size_t counter;
   fprintf(stderr, "info: connected to a server running ");
   for(counter = 0; counter < req->len; counter ++)
     putc(((char *)req_data)[counter], stderr);
   putc('\n', stderr);
   /* am I supposed to respond here? ;-) */
+}
 static void handle_disconnect(distren_t distren, struct remoteio *rem, struct distren_request *req, void *req_data)
+{
   size_t tmp;
   fputs("warning: The server has disconnected us because ``", stderr);
   tmp = fwrite(req_data, 1, req->len, stderr);
   fputs("''\n", stderr);
   remoteio_close(distren->rem);
+}

src/common/protocol.c

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@@ @@ -114,6 +114,58 @@ int distren_request_new_fromdata(struct @@
   return 0;
+}
 size_t distren_request_handle(size_t *expectlen,
 			      void *buf,
 			      size_t len,
 			      struct distren_request **req,
 			      void **req_data,
 			      short *err)
+{
   size_t dead_expectlen;
   *err = 0;
   *req = NULL;
   if(!expectlen)
+    {
       dead_expectlen = 0;
       expectlen = &dead_expectlen;
+    }
   if(!*expectlen)
+    {
       if(len < sizeof(struct distren_request))
 	return 0;
       if(distren_request_new_fromdata(req, buf, len))
+	{
 	  fprintf(stderr, "Error trying to handle packet\n");
 	  *err = 1;
 	  return 0;
+	}
       *expectlen = sizeof(struct distren_request) + (*req)->len;
+    }
   if(!*expectlen
      || len < *expectlen)
+    {
       if(*req)
+	{
 	  distren_request_free(*req);
 	  *req = NULL;
+	}
       return 0;
+    }
   if(!*req)
     distren_request_new_fromdata(req, buf, len);
   *req_data = buf + sizeof(struct distren_request);
   return sizeof(struct distren_request) + (*req)->len;
+}
 int distren_request_free(struct distren_request *req)
+{
   free(req);

src/common/protocol.h

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@@ @@ -24,71 +24,161 @@ @@
 #include <stdint.h>
 /**
    Server types:
  * Server types:
+ *
  * It is assumed that any client has at least the functionality of a
  * normal client (i.e., accepts all of the REQUIRED requests). These
  * bitmask values add to the types of requests one may make to a
  * server. After first connecting to a server or receiving a
  * connection, a client shall send a DISTREN_REQUEST_VERSION packet
  * describing its version.
  */
 #define DISTREN_SERVERTYPE_SUBMIT (0x1)
 #define DISTREN_SERVERTYPE_DISTRIBUTE (0x2)
 #define DISTREN_SERVERTYPE_RENDER (0x4)
 #define DISTREN_SERVERTYPE_CLIENT (0x8)
 /**
    This file defines the constants and structs that the client uses to talk to the server and that the servers use to talk to eachother.
  * This file defines the constants and structs that distren clients
  * and server use to converse.
  */
 /**
-   generic, shared requests
+ * List of request types and metadata.
  */
 enum distren_request_type
+  {
     /**
        identifies the version of software being
        used by the sender and tells if it is a client or server.
        Just send PACKAGE_STRING.
      * identifies the version of software being used by the sender and
      * tells if it is a client or server. Sends PACKAGE_STRING as well
      * as informing the other server what type of server this is.
+     *
      * DATA: struct distren_request followed by PACKAGE_STRING. The length of PACKAGE_STRING must be no longer than 32 bytes.
+     *
      * REQUIRED: ALL
     */
     DISTREN_REQUEST_VERSION = 1,
     /**
      * DATA: up to 32 bytes of a PING cookie
+     *
      * REQUIRED: ALL
      */
     DISTREN_REQUEST_PING = 2,
     /**
      * DATA: up to 32 bytes copied from a received PING cookie
+     *
      * REQUIRED: ALL
      */
     DISTREN_REQUEST_PONG = 3,
     /**
        The data is the a reason describing why the one end is
        disconnecting. The other end should respectfully close()
        the socket or the sender will timeout shortly.
      * The data is the a reason describing why the one end is
      * disconnecting. The other end should respectfully close()
      * the socket or the sender will timeout shortly.
+     *
      * DATA: A string describing the reason for the connection's
      * termination.
+     *
      * REQUIRED: ALL
      */
     DISTREN_REQUEST_DISCONNECT = 4,
     /**
        client->server only requests
      * DATA: struct distren_request_submit
+     *
      * REQUIRED: DISTREN_SERVERTYPE_SUBMIT
     */
     DISTREN_REQUEST_SUBMIT = 5,
     /**
        anything->server requests
      * Inform the other party about a job.
+     *
      * DATA: struct distren_request_jobinfo
+     *
      * REQUIRED: ALL
      */
-    DISTREN_REQUEST_JOBINFO = 6, /*< retrieves information about a job based on its number */
     DISTREN_REQUEST_JOBINFO = 6,
     /**
        server->anything
      * Request a DISTREN_REQUEST_JOBINFO
+     *
      * DATA: struct distren_request_jobinfo_get
+     *
      * REQUIRED: DISTREN_SERVERTYPE_SUBMIT, DISTREN_SERVERTYPE_DISTRIBUTE
      */
     DISTREN_REQUEST_JOBINFO_RESPONSE = 7, /*< returns information about a job */
     DISTREN_REQUEST_JOBINFO_GET = 7,
     /**
      * Command the other party to render a frame
+     *
      * DATA: struct distren_request_frame_render
+     *
      * REQUIRED: DISTREN_SERVERTYPE_RENDER
      */
     DISTREN_REQUEST_FRAME_RENDER = 8,
     /**
      * Inform the receiver of the sender's state, such as frames being
      * rendered or jobs that need to be completed.
+     *
      * DATA: struct distren_request_status
+     *
      * REQUIRED: DISTREN_SERVERTYPE_RENDER, DISTREN_SERVERTYPE_DISTRIBUTE, DISTREN_SERVERTYPE_CLIENT
      */
     DISTREN_REQUEST_STATUS = 9,
     /**
        server->server
      * Request that the receiver send a DISTREN_REQUEST_FRAME_STATUS
      * packet. No data because the sending party might not beforehand
      * know what frames/jobs the receiving server is managing.
+     *
      * DATA: (none)
+     *
      * REQUIRED: DISTREN_SERVERTYPE_RENDER
     */
     DISTREN_REQUEST_RENDERFRAME = 8,
     DISTREN_REQUEST_DONEFRAME = 9, /* server should check to make sure the
 slave is repoting on a frame it's actually assigned to */
     DISTREN_REQUEST_PROGRESS = 10, /*< tells another server of the progress of the first server's work at rendering */
     DISTREN_REQUEST_GETWORK = 11,
     DISTREN_REQUEST_GETVERSION = 12, /*< returns version of software that slave should be running */
     DISTREN_REQUEST_GETRENDERPOWER = 13, /* returns the render power of a slave */
     DISTREN_REQUEST_SETRENDERPOWER = 14, /* sets renderpower in server
 database */
     DISTREN_REQUEST_STATUS_GET = 10,
     /**
        sets a frame back to unassigned,
        happens if the slave quits for some reason. server code should only allow
        resetting of a frame assigned to the slave calling the request (see php
        code)
      * Allow a client to upload a job tarball over a remoteio line.  A
      * client that wants to do this must take care not to overbuffer
      * his sendqueue so as to be able to respond to PING packets in
      * time. A server receiving such a message will want to write the
      * file as directly to disk as possible to avoid bagging a server
      * down in swap.
+     *
      * It is potential that if a server is DISTREN_SERVERTYPE_SUBMIT
      * but not also DISTREN_SERVERTYPE_DISTRIBUTE, that this request
      * would be relayed by the DISTREN_SERVERTYPE_SUBMIT server to a
      * DISTREN_SERVERTYPE_DISTRIBUTE server so that other clients can
      * obtain the file from the distribution server. In this case, the
      * file's URL is already known.
+     *
      * Of course, having this sort of functionality at all is where
      * the nasty security issues start coming into play :-D.
+     *
      * DATA: struct distren_request_file_post followed by a maximum of 131072 bytes (128kB).
+     *
      * REQUIRED: DISTREN_SERVERTYPE_SUBMIT, DISTREN_SERVERTYPE_DISTRIBUTE
     */
-    DISTREN_REQUEST_RESETFRAME = 15,
+    DISTREN_REQUEST_FILE_POST = 11,
     /**
      * Request information about obtaining a file (such as a
      * cURL-compatible URL) based on a distren file URL.
+     *
      * DATA: struct distren_request_file_find
+     *
      * REQUIRED: DISTREN_SERVERTYPE_DISTRIBUTE
      */
     DISTREN_REQUEST_FILE_FIND = 12,
     /**
      * Provide information about obtaining a file (such as a URL).
+     *
      * DATA: struct distren_request_file
+     *
      * REQUIRED: DISTREN_SERVERTYPE_DISTRIBUTE
      */
     DISTREN_REQUEST_FILE = 13,
   };
 struct distren_request
@@ @@ -101,6 +191,15 @@ struct distren_request @@
 };
 /**
  * A DISTREN_REQUEST_VERSION is started with a bitmask specification
  * of the DISTREN_SERVERTYPE_* values.
  */
 struct distren_request_version
+{
 };
 /**
  * initializes and allocates request
  */
 int distren_request_new(struct distren_request **req, uint32_t len, enum distren_request_type type);
@@ @@ -127,6 +226,29 @@ int distren_request_send(struct remoteio @@
 int distren_request_new_fromdata(struct distren_request **req, void *data, size_t len);
 /**
  * Parses requests in a way suitable to be called from a
  * remoteio_read_handle_func_t.
+ *
  * If this function returns non-zero, you should handle the request
  * and then call this function again (after shortening len and
  * incrementing buf, of course).
+ *
  * @param expectlen A pointer to a state variable that, if not NULL, can speed up this function. If you want to use this, you must set the variable to 0 before the first call and preserve the variable.
  * @param buf the input buffer.
  * @param len the length of buf.
  * @param req a pointer to where we should set NULL if we don't have a full request or where we store the address of a newly allocated request. You should call distren_request_free() on this.
  * @param req_data a pointer to where the request data pointer should be stored. This will just be set to a pointer in buf, so don't free() this.
  * @param err this will be set to 0 if there is no error and to 1 if there is an error and the connection should be closed. You must check this.
  * @return number of bytes that we have used from buf and that should be marked used.
  */
 size_t distren_request_handle(size_t *expectlen,
 			      void *buf,
 			      size_t len,
 			      struct distren_request **req,
 			      void **req_data,
 			      short *err);
 /**
  * frees request
  */
 int distren_request_free(struct distren_request *req);

src/server/distrend.c

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@@ @@ -181,41 +181,16 @@ int main(int argc, char *argv[]) @@
   distrend_listen_handler_add(general_info.config->listens, DISTREN_REQUEST_VERSION, &distrend_handle_version);
   int slaveKey = 0; // Remotio should set me on a per-slave basis
   /* Main Loop */
   general_info.config->die = 0;
   while(!general_info.config->die)
+    {
       int clientrequest = 0; /*< temporary example variable, will be replaced when we can handle messages */
       multiio_poll(multiio, 15000);
       tabletennis_serve(general_info.config->listens->tabletennis);
       /* Run the watchdog, @TODO: like every 10 mins or something */
       frame_watchdog(general_info.conn);
       struct frameset frame;
       struct distrenjob *job;
       distrenjob_new(&job);
       memset(&frame, '\0', sizeof(frame));
       /** If client requests work */
       if(clientrequest == DISTREN_REQUEST_GETWORK)
+	{
 	  int returnnum = find_jobframe(general_info.conn, slaveKey, &job->jobnum, &frame.num); // Finds a frame to render @FIXME: Slavenum :D
 	  if(returnnum); /* No work on server */
 	  else
 	    remotio_send_to_client(frame.num, job->jobnum); // Pseudo-sends data to client
+	}
       /* If the client states that they finished the frame */
       else if(clientrequest == DISTREN_REQUEST_DONEFRAME)
+	{
 	  clientstatus = CLIENTSTATUS_IDLE; // Sets the client back to idle
 	  finish_frame(general_info.conn, 0, job->jobnum, frame.num); // @TODO: Make sure this actually works.
+	}
       distrenjob_free(&job);
+    }
   distrend_listen_free(general_info.config->listens);

src/server/slavefuncs.c

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@@ @@ -896,7 +896,7 @@ int sendExtSignal(struct remoteio *rem, @@
 void finishframe(struct remoteio *rem, int jobnum, int framenum){
   char* data;
   _distren_asprintf(&data, "%d%d", jobnum, framenum);
-  sendExtSignal(rem, DISTREN_REQUEST_DONEFRAME, data);
+  sendExtSignal(rem, DISTREN_REQUEST_STATUS, data);
+}
 /** resets frame to unassigned on server */
@@ @@ -904,7 +904,7 @@ void resetframe(struct remoteio *rem, in @@
   fprintf(stderr,"Resetting frame %d in job %d on server... ",framenum,jobnum);
   char* data;
   _distren_asprintf(&data, "%d%d", jobnum, framenum);
- sendExtSignal(rem, DISTREN_REQUEST_RESETFRAME, data);
+ sendExtSignal(rem, DISTREN_REQUEST_STATUS, data);
+}
@@ @@ -914,7 +914,7 @@ void startframe(struct remoteio *rem, in @@
     fprintf(stderr,"Marking frame %d started on server... ",framenum);
   char* data;
   _distren_asprintf(&data, "%d%d", jobnum, framenum);
-  sendExtSignal(rem, DISTREN_REQUEST_RENDERFRAME, data);
+  sendExtSignal(rem, DISTREN_REQUEST_STATUS, data);
+}
@@ @@ -950,27 +950,30 @@ int getwork(struct remoteio *rem, int *j @@
   //distren_request_new(&req,
-  sendExtSignal(rem, DISTREN_REQUEST_GETWORK, data);
+  sendExtSignal(rem, DISTREN_REQUEST_STATUS, data);
   return 0;
+}
 /** sets render power of slave on server */
 void setrenderpower(struct remoteio *rem, int renderpower){
 void setrenderpower(struct remoteio *rem, int renderpower)
+{
   fprintf(stderr,"Setting render power on server... ");
   char* data;
   _distren_asprintf(&data, "%d", renderpower);
   sendExtSignal(rem,DISTREN_REQUEST_SETRENDERPOWER, data);
+  /* sendExtSignal(rem,DISTREN_REQUEST_SETRENDERPOWER, data); */
+}
 /** retrieves render power of slave from server */
 int getrenderpower(struct remoteio *rem){
   sendSignal(rem, DISTREN_REQUEST_GETRENDERPOWER);
 int getrenderpower(struct remoteio *rem)
+{
   /*  sendSignal(rem, DISTREN_REQUEST_GETRENDERPOWER);*/
   return 0;
+}
 /** compares slave software version with server software version */
 int checkslaveversion(struct remoteio *rem){
   sendSignal(rem, DISTREN_REQUEST_GETVERSION);
 int checkslaveversion(struct remoteio *rem)
+{
   sendSignal(rem, DISTREN_REQUEST_VERSION);
   char* serverVersionFromRemotio = "9000";
   if(!strcmp(PACKAGE_VERSION, serverVersionFromRemotio)) // compare versions
     return 1;

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