OpenSRF/src/libstack/osrf_prefork.c

   1 #include "osrf_prefork.h"
   2 #include <signal.h>
   3 #include "osrf_app_session.h"
   4 #include "osrf_application.h"
   5
   6 /* true if we just deleted a child.  This will allow us to make sure we're
   7         not trying to use freed memory */
   8 int child_dead;
   9
  10 int main();
  11 void sigchld_handler( int sig );
  12
  13 int osrf_prefork_run(char* appname) {
  14
  15         if(!appname) {
  16                 osrfLogError( OSRF_LOG_MARK, "osrf_prefork_run requires an appname to run!");
  17                 return -1;
  18         }
  19
  20         set_proc_title( "OpenSRF Listener [%s]", appname );
  21
  22         int maxr = 1000;
  23         int maxc = 10;
  24         int minc = 3;
  25
  26         osrfLogInfo( OSRF_LOG_MARK, "Loading config in osrf_forker for app %s", appname);
  27
  28         jsonObject* max_req = osrf_settings_host_value_object("/apps/%s/unix_config/max_requests", appname);
  29         jsonObject* min_children = osrf_settings_host_value_object("/apps/%s/unix_config/min_children", appname);
  30         jsonObject* max_children = osrf_settings_host_value_object("/apps/%s/unix_config/max_children", appname);
  31
  32         char* keepalive = osrf_settings_host_value("/apps/%s/keepalive", appname);
  33         time_t kalive;
  34         if( keepalive ) {
  35                 kalive = atoi(keepalive);
  36                 free(keepalive);
  37         } else {
  38                 kalive = 5; /* give it a default */
  39         }
  40
  41         osrfLogInfo(OSRF_LOG_MARK, "keepalive setting = %d seconds", kalive);
  42
  43
  44
  45         if(!max_req) osrfLogWarning( OSRF_LOG_MARK, "Max requests not defined, assuming 1000");
  46         else maxr = (int) jsonObjectGetNumber(max_req);
  47
  48         if(!min_children) osrfLogWarning( OSRF_LOG_MARK, "Min children not defined, assuming 3");
  49         else minc = (int) jsonObjectGetNumber(min_children);
  50
  51         if(!max_children) osrfLogWarning( OSRF_LOG_MARK, "Max children not defined, assuming 10");
  52         else maxc = (int) jsonObjectGetNumber(max_children);
  53
  54         jsonObjectFree(max_req);
  55         jsonObjectFree(min_children);
  56         jsonObjectFree(max_children);
  57         /* --------------------------------------------------- */
  58
  59         char* resc = va_list_to_string("%s_listener", appname);
  60
  61         if(!osrf_system_bootstrap_client_resc( NULL, NULL, resc )) {
  62                 osrfLogError( OSRF_LOG_MARK, "Unable to bootstrap client for osrf_prefork_run()");
  63                 free(resc);
  64                 return -1;
  65         }
  66
  67         free(resc);
  68
  69         prefork_simple* forker = prefork_simple_init(
  70                 osrfSystemGetTransportClient(), maxr, minc, maxc);
  71
  72         forker->appname = strdup(appname);
  73         forker->keepalive       = kalive;
  74
  75         if(forker == NULL) {
  76                 osrfLogError( OSRF_LOG_MARK, "osrf_prefork_run() failed to create prefork_simple object");
  77                 return -1;
  78         }
  79
  80         prefork_launch_children(forker);
  81
  82         osrf_prefork_register_routers(appname);
  83
  84         osrfLogInfo( OSRF_LOG_MARK, "Launching osrf_forker for app %s", appname);
  85         prefork_run(forker);
  86
  87         osrfLogWarning( OSRF_LOG_MARK, "prefork_run() retuned - how??");
  88         prefork_free(forker);
  89         return 0;
  90
  91 }
  92
  93 void osrf_prefork_register_routers( char* appname ) {
  94
  95         osrfStringArray* arr = osrfNewStringArray(4);
  96
  97         int c = osrfConfigGetValueList( NULL, arr, "/routers/router" );
  98         char* routerName = osrfConfigGetValue( NULL, "/router_name" );
  99         transport_client* client = osrfSystemGetTransportClient();
 100
 101         osrfLogInfo( OSRF_LOG_MARK, "router name is %s and we have %d routers to connect to", routerName, c );
 102
 103         while( c ) {
 104                 char* domain = osrfStringArrayGetString(arr, --c);
 105                 if(domain) {
 106
 107                         char* jid = va_list_to_string( "%s@%s/router", routerName, domain );
 108                         osrfLogInfo( OSRF_LOG_MARK, "Registering with router %s", jid );
 109
 110                         transport_message* msg = message_init("registering", NULL, NULL, jid, NULL );
 111                         message_set_router_info( msg, NULL, NULL, appname, "register", 0 );
 112
 113                         client_send_message( client, msg );
 114                         message_free( msg );
 115                         free(jid);
 116                 }
 117         }
 118
 119         free(routerName);
 120         osrfStringArrayFree(arr);
 121 }
 122
 123 int prefork_child_init_hook(prefork_child* child) {
 124
 125         if(!child) return -1;
 126         osrfLogDebug( OSRF_LOG_MARK, "Child init hook for child %d", child->pid);
 127         char* resc = va_list_to_string("%s_drone",child->appname);
 128
 129         /* we want to remove traces of our parents socket connection
 130          * so we can have our own */
 131         osrfSystemIgnoreTransportClient();
 132
 133         if(!osrf_system_bootstrap_client_resc( NULL, NULL, resc)) {
 134                 osrfLogError( OSRF_LOG_MARK, "Unable to bootstrap client for osrf_prefork_run()");
 135                 free(resc);
 136                 return -1;
 137         }
 138
 139         free(resc);
 140
 141         if( ! osrfAppRunChildInit(child->appname) ) {
 142                 osrfLogDebug(OSRF_LOG_MARK, "Prefork child_init succeeded\n");
 143         } else {
 144                 osrfLogError(OSRF_LOG_MARK, "Prefork child_init failed\n");
 145                 return -1;
 146         }
 147
 148         set_proc_title( "OpenSRF Drone [%s]", child->appname );
 149         return 0;
 150 }
 151
 152 void prefork_child_process_request(prefork_child* child, char* data) {
 153         if( !child ) return;
 154
 155         /* construct the message from the xml */
 156         transport_message* msg = new_message_from_xml( data );
 157
 158         osrfAppSession* session = osrf_stack_transport_handler(msg, child->appname);
 159         if(!session) return;
 160
 161         if( session->stateless && session->state != OSRF_SESSION_CONNECTED ) {
 162                 osrfAppSessionFree( session );
 163                 return;
 164         }
 165
 166         osrfLogDebug( OSRF_LOG_MARK, "Entering keepalive loop for session %s", session->session_id );
 167         int keepalive = child->keepalive;
 168         int retval;
 169         time_t start;
 170         time_t end;
 171
 172         while(1) {
 173
 174                 osrfLogDebug(OSRF_LOG_MARK,
 175                                 "osrf_prefork calling queue_wait [%d] in keepalive loop", keepalive);
 176                 start           = time(NULL);
 177                 retval  = osrf_app_session_queue_wait(session, keepalive);
 178                 end             = time(NULL);
 179
 180                 if(retval) {
 181                         osrfLogError(OSRF_LOG_MARK, "queue-wait returned non-success %d", retval);
 182                         break;
 183                 }
 184
 185                 /* see if the client disconnected from us */
 186                 if(session->state != OSRF_SESSION_CONNECTED) break;
 187
 188                 /* see if the used up the timeout */
 189                 if( (end - start) >= keepalive ) {
 190
 191                         osrfLogDebug(OSRF_LOG_MARK, "Keepalive timed out, exiting connected session");
 192
 193                         osrfAppSessionStatus(
 194                                         session,
 195                                         OSRF_STATUS_TIMEOUT,
 196                                         "osrfConnectStatus",
 197                                         0, "Disconnected on timeout" );
 198
 199                         break;
 200                 }
 201         }
 202
 203         osrfLogDebug( OSRF_LOG_MARK, "Exiting keepalive loop for session %s", session->session_id );
 204         osrfAppSessionFree( session );
 205         return;
 206 }
 207
 208
 209 prefork_simple*  prefork_simple_init( transport_client* client,
 210                 int max_requests, int min_children, int max_children ) {
 211
 212         if( min_children > max_children ) {
 213                 osrfLogError( OSRF_LOG_MARK,  "min_children (%d) is greater "
 214                                 "than max_children (%d)", min_children, max_children );
 215                 return NULL;
 216         }
 217
 218         if( max_children > ABS_MAX_CHILDREN ) {
 219                 osrfLogError( OSRF_LOG_MARK,  "max_children (%d) is greater than ABS_MAX_CHILDREN (%d)",
 220                                 max_children, ABS_MAX_CHILDREN );
 221                 return NULL;
 222         }
 223
 224         osrfLogInfo(OSRF_LOG_MARK, "Prefork launching child with max_request=%d,"
 225                 "min_children=%d, max_children=%d", max_requests, min_children, max_children );
 226
 227         /* flesh out the struct */
 228         prefork_simple* prefork = (prefork_simple*) safe_malloc(sizeof(prefork_simple));
 229         prefork->max_requests = max_requests;
 230         prefork->min_children = min_children;
 231         prefork->max_children = max_children;
 232         prefork->first_child = NULL;
 233         prefork->connection = client;
 234
 235         return prefork;
 236 }
 237
 238 prefork_child*  launch_child( prefork_simple* forker ) {
 239
 240         pid_t pid;
 241         int data_fd[2];
 242         int status_fd[2];
 243
 244         /* Set up the data pipes and add the child struct to the parent */
 245         if( pipe(data_fd) < 0 ) { /* build the data pipe*/
 246                 osrfLogError( OSRF_LOG_MARK,  "Pipe making error" );
 247                 return NULL;
 248         }
 249
 250         if( pipe(status_fd) < 0 ) {/* build the status pipe */
 251                 osrfLogError( OSRF_LOG_MARK,  "Pipe making error" );
 252                 return NULL;
 253         }
 254
 255         osrfLogInternal( OSRF_LOG_MARK,  "Pipes: %d %d %d %d", data_fd[0], data_fd[1], status_fd[0], status_fd[1] );
 256         prefork_child* child = prefork_child_init( forker->max_requests, data_fd[0],
 257                         data_fd[1], status_fd[0], status_fd[1] );
 258
 259         child->appname = strdup(forker->appname);
 260         child->keepalive = forker->keepalive;
 261
 262
 263         add_prefork_child( forker, child );
 264
 265         if( (pid=fork()) < 0 ) {
 266                 osrfLogError( OSRF_LOG_MARK,  "Forking Error" );
 267                 return NULL;
 268         }
 269
 270         if( pid > 0 ) {  /* parent */
 271
 272                 signal(SIGCHLD, sigchld_handler);
 273                 (forker->current_num_children)++;
 274                 child->pid = pid;
 275
 276                 osrfLogDebug( OSRF_LOG_MARK,  "Parent launched %d", pid );
 277                 /* *no* child pipe FD's can be closed or the parent will re-use fd's that
 278                         the children are currently using */
 279                 return child;
 280         }
 281
 282         else { /* child */
 283
 284                 osrfLogInternal( OSRF_LOG_MARK, "I am  new child with read_data_fd = %d and write_status_fd = %d",
 285                         child->read_data_fd, child->write_status_fd );
 286
 287                 child->pid = getpid();
 288                 close( child->write_data_fd );
 289                 close( child->read_status_fd );
 290
 291                 /* do the initing */
 292                 if( prefork_child_init_hook(child) == -1 ) {
 293                         osrfLogError(OSRF_LOG_MARK,
 294                                 "Forker child going away because we could not connect to OpenSRF...");
 295                         exit(1);
 296                 }
 297
 298                 prefork_child_wait( child );
 299                 exit(0); /* just to be sure */
 300          }
 301         return NULL;
 302 }
 303
 304
 305 void prefork_launch_children( prefork_simple* forker ) {
 306         if(!forker) return;
 307         int c = 0;
 308         while( c++ < forker->min_children )
 309                 launch_child( forker );
 310 }
 311
 312
 313 void sigchld_handler( int sig ) {
 314         signal(SIGCHLD, sigchld_handler);
 315         child_dead = 1;
 316 }
 317
 318
 319 void reap_children( prefork_simple* forker ) {
 320
 321         pid_t child_pid;
 322         int status;
 323
 324         while( (child_pid=waitpid(-1,&status,WNOHANG)) > 0)
 325                 del_prefork_child( forker, child_pid );
 326
 327         /* replenish */
 328         while( forker->current_num_children < forker->min_children )
 329                 launch_child( forker );
 330
 331         child_dead = 0;
 332 }
 333
 334 void prefork_run(prefork_simple* forker) {
 335
 336         if( forker->first_child == NULL )
 337                 return;
 338
 339         transport_message* cur_msg = NULL;
 340
 341
 342         while(1) {
 343
 344                 if( forker->first_child == NULL ) {/* no more children */
 345                         osrfLogWarning( OSRF_LOG_MARK, "No more children..." );
 346                         return;
 347                 }
 348
 349                 osrfLogDebug( OSRF_LOG_MARK, "Forker going into wait for data...");
 350                 cur_msg = client_recv( forker->connection, -1 );
 351
 352                 //fprintf(stderr, "Got Data %f\n", get_timestamp_millis() );
 353
 354                 if( cur_msg == NULL ) continue;
 355
 356                 int honored = 0;        /* true if we've serviced the request */
 357
 358                 while( ! honored ) {
 359
 360                         check_children( forker );
 361
 362                         osrfLogDebug( OSRF_LOG_MARK,  "Server received inbound data" );
 363                         int k;
 364                         prefork_child* cur_child = forker->first_child;
 365
 366                         /* Look for an available child */
 367                         for( k = 0; k < forker->current_num_children; k++ ) {
 368
 369                                 osrfLogInternal( OSRF_LOG_MARK, "Searching for available child. cur_child->pid = %d", cur_child->pid );
 370                                 osrfLogInternal( OSRF_LOG_MARK, "Current num children %d and loop %d", forker->current_num_children, k);
 371
 372                                 if( cur_child->available ) {
 373                                         osrfLogDebug( OSRF_LOG_MARK,  "forker sending data to %d", cur_child->pid );
 374
 375                                         message_prepare_xml( cur_msg );
 376                                         char* data = cur_msg->msg_xml;
 377                                         if( ! data || strlen(data) < 1 ) break;
 378
 379                                         cur_child->available = 0;
 380                                         osrfLogInternal( OSRF_LOG_MARK,  "Writing to child fd %d", cur_child->write_data_fd );
 381
 382                                         int written = 0;
 383                                         //fprintf(stderr, "Writing Data %f\n", get_timestamp_millis() );
 384                                         if( (written = write( cur_child->write_data_fd, data, strlen(data) + 1 )) < 0 ) {
 385                                                 osrfLogWarning( OSRF_LOG_MARK, "Write returned error %d", errno);
 386                                                 cur_child = cur_child->next;
 387                                                 continue;
 388                                         }
 389
 390                                         //fprintf(stderr, "Wrote %d bytes to child\n", written);
 391
 392                                         forker->first_child = cur_child->next;
 393                                         honored = 1;
 394                                         break;
 395                                 } else
 396                                         cur_child = cur_child->next;
 397                         }
 398
 399                         /* if none available, add a new child if we can */
 400                         if( ! honored ) {
 401                                 osrfLogDebug( OSRF_LOG_MARK, "Not enough children, attempting to add...");
 402                                 if( forker->current_num_children < forker->max_children ) {
 403                                         osrfLogDebug( OSRF_LOG_MARK,  "Launching new child with current_num = %d",
 404                                                         forker->current_num_children );
 405
 406                                         prefork_child* new_child = launch_child( forker );
 407                                         message_prepare_xml( cur_msg );
 408                                         char* data = cur_msg->msg_xml;
 409                                         if( ! data || strlen(data) < 1 ) break;
 410                                         new_child->available = 0;
 411                                         osrfLogDebug( OSRF_LOG_MARK,  "Writing to new child fd %d : pid %d",
 412                                                         new_child->write_data_fd, new_child->pid );
 413                                         write( new_child->write_data_fd, data, strlen(data) + 1 );
 414                                         forker->first_child = new_child->next;
 415                                         honored = 1;
 416                                 }
 417                         }
 418
 419                         if( !honored ) {
 420                                 osrfLogWarning( OSRF_LOG_MARK,  "No children available, sleeping and looping..." );
 421                                 usleep( 50000 ); /* 50 milliseconds */
 422                         }
 423
 424                         if( child_dead )
 425                                 reap_children(forker);
 426
 427
 428                         //fprintf(stderr, "Parent done with request %f\n", get_timestamp_millis() );
 429
 430                 } // honored?
 431
 432                 message_free( cur_msg );
 433
 434         } /* top level listen loop */
 435
 436 }
 437
 438
 439 void check_children( prefork_simple* forker ) {
 440
 441         //check_begin:
 442
 443         int select_ret;
 444         fd_set read_set;
 445         FD_ZERO(&read_set);
 446         int max_fd = 0;
 447         int n;
 448
 449         struct timeval tv;
 450         tv.tv_sec       = 0;
 451         tv.tv_usec      = 0;
 452
 453         if( child_dead )
 454                 reap_children(forker);
 455
 456         prefork_child* cur_child = forker->first_child;
 457
 458         int i;
 459         for( i = 0; i!= forker->current_num_children; i++ ) {
 460
 461                 if( cur_child->read_status_fd > max_fd )
 462                         max_fd = cur_child->read_status_fd;
 463                 FD_SET( cur_child->read_status_fd, &read_set );
 464                 cur_child = cur_child->next;
 465         }
 466
 467         FD_CLR(0,&read_set);/* just to be sure */
 468
 469         if( (select_ret=select( max_fd + 1 , &read_set, NULL, NULL, &tv)) == -1 ) {
 470                 osrfLogWarning( OSRF_LOG_MARK,  "Select returned error %d on check_children", errno );
 471         }
 472
 473         if( select_ret == 0 )
 474                 return;
 475
 476         /* see if one of a child has told us it's done */
 477         cur_child = forker->first_child;
 478         int j;
 479         int num_handled = 0;
 480         for( j = 0; j!= forker->current_num_children && num_handled < select_ret ; j++ ) {
 481
 482                 if( FD_ISSET( cur_child->read_status_fd, &read_set ) ) {
 483                         //printf( "Server received status from a child %d\n", cur_child->pid );
 484                         osrfLogDebug( OSRF_LOG_MARK,  "Server received status from a child %d", cur_child->pid );
 485
 486                         num_handled++;
 487
 488                         /* now suck off the data */
 489                         char buf[64];
 490                         memset( buf, 0, 64);
 491                         if( (n=read(cur_child->read_status_fd, buf, 63))  < 0 ) {
 492                                 osrfLogWarning( OSRF_LOG_MARK, "Read error afer select in child status read with errno %d", errno);
 493                         }
 494
 495                         osrfLogDebug( OSRF_LOG_MARK,  "Read %d bytes from status buffer: %s", n, buf );
 496                         cur_child->available = 1;
 497                 }
 498                 cur_child = cur_child->next;
 499         }
 500
 501 }
 502
 503
 504 void prefork_child_wait( prefork_child* child ) {
 505
 506         int i,n;
 507         growing_buffer* gbuf = buffer_init( READ_BUFSIZE );
 508         char buf[READ_BUFSIZE];
 509         memset( buf, 0, READ_BUFSIZE );
 510
 511         for( i = 0; i < child->max_requests; i++ ) {
 512
 513                 n = -1;
 514                 clr_fl(child->read_data_fd, O_NONBLOCK );
 515                 while( (n=read(child->read_data_fd, buf, READ_BUFSIZE-1)) > 0 ) {
 516                         buffer_add( gbuf, buf );
 517                         memset( buf, 0, READ_BUFSIZE );
 518
 519                         //fprintf(stderr, "Child read %d bytes\n", n);
 520
 521                         if( n == READ_BUFSIZE ) {
 522                                 //fprintf(stderr, "We read READ_BUFSIZE data....\n");
 523                                 /* XXX */
 524                                 /* either we have exactly READ_BUFSIZE data,
 525                                         or there's more waiting that we need to grab*/
 526                                 /* must set to non-block for reading more */
 527                         } else {
 528                                 //fprintf(stderr, "Read Data %f\n", get_timestamp_millis() );
 529                                 prefork_child_process_request(child, gbuf->buf);
 530                                 buffer_reset( gbuf );
 531                                 break;
 532                         }
 533                 }
 534
 535                 if( n < 0 ) {
 536                         osrfLogWarning( OSRF_LOG_MARK,  "Prefork child read returned error with errno %d", errno );
 537                         break;
 538                 }
 539
 540                 if( i < child->max_requests - 1 )
 541                         write( child->write_status_fd, "available" /*less than 64 bytes*/, 9 );
 542         }
 543
 544         buffer_free(gbuf);
 545
 546         osrfLogDebug( OSRF_LOG_MARK, "Child with max-requests=%d, num-served=%d exiting...[%d]",
 547                         child->max_requests, i, getpid() );
 548
 549         exit(0);
 550 }
 551
 552
 553 void add_prefork_child( prefork_simple* forker, prefork_child* child ) {
 554
 555         if( forker->first_child == NULL ) {
 556                 forker->first_child = child;
 557                 child->next = child;
 558                 return;
 559         }
 560
 561         /* we put the child in as the last because, regardless,
 562                 we have to do the DLL splice dance, and this is the
 563            simplest way */
 564
 565         prefork_child* start_child = forker->first_child;
 566         while(1) {
 567                 if( forker->first_child->next == start_child )
 568                         break;
 569                 forker->first_child = forker->first_child->next;
 570         }
 571
 572         /* here we know that forker->first_child is the last element
 573                 in the list and start_child is the first.  Insert the
 574                 new child between them*/
 575
 576         forker->first_child->next = child;
 577         child->next = start_child;
 578         return;
 579 }
 580
 581 prefork_child* find_prefork_child( prefork_simple* forker, pid_t pid ) {
 582
 583         if( forker->first_child == NULL ) { return NULL; }
 584         prefork_child* start_child = forker->first_child;
 585         do {
 586                 if( forker->first_child->pid == pid )
 587                         return forker->first_child;
 588         } while( (forker->first_child = forker->first_child->next) != start_child );
 589
 590         return NULL;
 591 }
 592
 593
 594 void del_prefork_child( prefork_simple* forker, pid_t pid ) {
 595
 596         if( forker->first_child == NULL ) { return; }
 597
 598         (forker->current_num_children)--;
 599         osrfLogDebug( OSRF_LOG_MARK, "Deleting Child: %d", pid );
 600
 601         prefork_child* start_child = forker->first_child; /* starting point */
 602         prefork_child* cur_child        = start_child; /* current pointer */
 603         prefork_child* prev_child       = start_child; /* the trailing pointer */
 604
 605         /* special case where there is only one in the list */
 606         if( start_child == start_child->next ) {
 607                 if( start_child->pid == pid ) {
 608                         forker->first_child = NULL;
 609
 610                         close( start_child->read_data_fd );
 611                         close( start_child->write_data_fd );
 612                         close( start_child->read_status_fd );
 613                         close( start_child->write_status_fd );
 614
 615                         prefork_child_free( start_child );
 616                 }
 617                 return;
 618         }
 619
 620
 621         /* special case where the first item in the list needs to be removed */
 622         if( start_child->pid == pid ) {
 623
 624                 /* find the last one so we can remove the start_child */
 625                 do {
 626                         prev_child = cur_child;
 627                         cur_child = cur_child->next;
 628                 }while( cur_child != start_child );
 629
 630                 /* now cur_child == start_child */
 631                 prev_child->next = cur_child->next;
 632                 forker->first_child = prev_child;
 633
 634                 close( cur_child->read_data_fd );
 635                 close( cur_child->write_data_fd );
 636                 close( cur_child->read_status_fd );
 637                 close( cur_child->write_status_fd );
 638
 639                 prefork_child_free( cur_child );
 640                 return;
 641         }
 642
 643         do {
 644                 prev_child = cur_child;
 645                 cur_child = cur_child->next;
 646
 647                 if( cur_child->pid == pid ) {
 648                         prev_child->next = cur_child->next;
 649
 650                         close( cur_child->read_data_fd );
 651                         close( cur_child->write_data_fd );
 652                         close( cur_child->read_status_fd );
 653                         close( cur_child->write_status_fd );
 654
 655                         prefork_child_free( cur_child );
 656                         return;
 657                 }
 658
 659         } while(cur_child != start_child);
 660 }
 661
 662
 663
 664
 665 prefork_child* prefork_child_init(
 666         int max_requests, int read_data_fd, int write_data_fd,
 667         int read_status_fd, int write_status_fd ) {
 668
 669         prefork_child* child = (prefork_child*) safe_malloc(sizeof(prefork_child));
 670         child->max_requests             = max_requests;
 671         child->read_data_fd             = read_data_fd;
 672         child->write_data_fd            = write_data_fd;
 673         child->read_status_fd   = read_status_fd;
 674         child->write_status_fd  = write_status_fd;
 675         child->available                        = 1;
 676
 677         return child;
 678 }
 679
 680
 681 int prefork_free( prefork_simple* prefork ) {
 682
 683         while( prefork->first_child != NULL ) {
 684                 osrfLogInfo( OSRF_LOG_MARK,  "Killing children and sleeping 1 to reap..." );
 685                 kill( 0,        SIGKILL );
 686                 sleep(1);
 687         }
 688
 689         client_free(prefork->connection);
 690         free(prefork->appname);
 691         free( prefork );
 692         return 1;
 693 }
 694
 695 int prefork_child_free( prefork_child* child ) {
 696         free(child->appname);
 697         close(child->read_data_fd);
 698         close(child->write_status_fd);
 699         free( child );
 700         return 1;
 701 }
 702