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         transport_client* client = osrfSystemGetTransportClient();
 156
 157         if(!client_connected(client)) {
 158                 osrfSystemIgnoreTransportClient();
 159                 osrfLogWarning(OSRF_LOG_MARK, "Reconnecting child to opensrf after disconnect...");
 160                 if(!osrf_system_bootstrap_client(NULL, NULL)) {
 161                         osrfLogError( OSRF_LOG_MARK,
 162                                 "Unable to bootstrap client in prefork_child_process_request()");
 163                         sleep(1);
 164                         exit(1);
 165                 }
 166         }
 167
 168         /* construct the message from the xml */
 169         transport_message* msg = new_message_from_xml( data );
 170
 171         osrfAppSession* session = osrf_stack_transport_handler(msg, child->appname);
 172         if(!session) return;
 173
 174         if( session->stateless && session->state != OSRF_SESSION_CONNECTED ) {
 175                 osrfAppSessionFree( session );
 176                 return;
 177         }
 178
 179         osrfLogDebug( OSRF_LOG_MARK, "Entering keepalive loop for session %s", session->session_id );
 180         int keepalive = child->keepalive;
 181         int retval;
 182         int recvd;
 183         time_t start;
 184         time_t end;
 185
 186         while(1) {
 187
 188                 osrfLogDebug(OSRF_LOG_MARK,
 189                                 "osrf_prefork calling queue_wait [%d] in keepalive loop", keepalive);
 190                 start           = time(NULL);
 191                 retval  = osrf_app_session_queue_wait(session, keepalive, &recvd);
 192                 end             = time(NULL);
 193
 194                 osrfLogDebug(OSRF_LOG_MARK, "Data received == %d", recvd);
 195
 196                 if(retval) {
 197                         osrfLogError(OSRF_LOG_MARK, "queue-wait returned non-success %d", retval);
 198                         break;
 199                 }
 200
 201                 /* see if the client disconnected from us */
 202                 if(session->state != OSRF_SESSION_CONNECTED) break;
 203
 204                 /* if no data was reveived within the timeout interval */
 205                 if( !recvd && (end - start) >= keepalive ) {
 206                         osrfLogInfo(OSRF_LOG_MARK, "No request was reveived in %d seconds, exiting stateful session", keepalive);
 207                         osrfAppSessionStatus(
 208                                         session,
 209                                         OSRF_STATUS_TIMEOUT,
 210                                         "osrfConnectStatus",
 211                                         0, "Disconnected on timeout" );
 212
 213                         break;
 214                 }
 215         }
 216
 217         osrfLogDebug( OSRF_LOG_MARK, "Exiting keepalive loop for session %s", session->session_id );
 218         osrfAppSessionFree( session );
 219         return;
 220 }
 221
 222
 223 prefork_simple*  prefork_simple_init( transport_client* client,
 224                 int max_requests, int min_children, int max_children ) {
 225
 226         if( min_children > max_children ) {
 227                 osrfLogError( OSRF_LOG_MARK,  "min_children (%d) is greater "
 228                                 "than max_children (%d)", min_children, max_children );
 229                 return NULL;
 230         }
 231
 232         if( max_children > ABS_MAX_CHILDREN ) {
 233                 osrfLogError( OSRF_LOG_MARK,  "max_children (%d) is greater than ABS_MAX_CHILDREN (%d)",
 234                                 max_children, ABS_MAX_CHILDREN );
 235                 return NULL;
 236         }
 237
 238         osrfLogInfo(OSRF_LOG_MARK, "Prefork launching child with max_request=%d,"
 239                 "min_children=%d, max_children=%d", max_requests, min_children, max_children );
 240
 241         /* flesh out the struct */
 242         prefork_simple* prefork = (prefork_simple*) safe_malloc(sizeof(prefork_simple));
 243         prefork->max_requests = max_requests;
 244         prefork->min_children = min_children;
 245         prefork->max_children = max_children;
 246         prefork->first_child = NULL;
 247         prefork->connection = client;
 248
 249         return prefork;
 250 }
 251
 252 prefork_child*  launch_child( prefork_simple* forker ) {
 253
 254         pid_t pid;
 255         int data_fd[2];
 256         int status_fd[2];
 257
 258         /* Set up the data pipes and add the child struct to the parent */
 259         if( pipe(data_fd) < 0 ) { /* build the data pipe*/
 260                 osrfLogError( OSRF_LOG_MARK,  "Pipe making error" );
 261                 return NULL;
 262         }
 263
 264         if( pipe(status_fd) < 0 ) {/* build the status pipe */
 265                 osrfLogError( OSRF_LOG_MARK,  "Pipe making error" );
 266                 return NULL;
 267         }
 268
 269         osrfLogInternal( OSRF_LOG_MARK,  "Pipes: %d %d %d %d", data_fd[0], data_fd[1], status_fd[0], status_fd[1] );
 270         prefork_child* child = prefork_child_init( forker->max_requests, data_fd[0],
 271                         data_fd[1], status_fd[0], status_fd[1] );
 272
 273         child->appname = strdup(forker->appname);
 274         child->keepalive = forker->keepalive;
 275
 276
 277         add_prefork_child( forker, child );
 278
 279         if( (pid=fork()) < 0 ) {
 280                 osrfLogError( OSRF_LOG_MARK,  "Forking Error" );
 281                 return NULL;
 282         }
 283
 284         if( pid > 0 ) {  /* parent */
 285
 286                 signal(SIGCHLD, sigchld_handler);
 287                 (forker->current_num_children)++;
 288                 child->pid = pid;
 289
 290                 osrfLogDebug( OSRF_LOG_MARK,  "Parent launched %d", pid );
 291                 /* *no* child pipe FD's can be closed or the parent will re-use fd's that
 292                         the children are currently using */
 293                 return child;
 294         }
 295
 296         else { /* child */
 297
 298                 osrfLogInternal( OSRF_LOG_MARK, "I am  new child with read_data_fd = %d and write_status_fd = %d",
 299                         child->read_data_fd, child->write_status_fd );
 300
 301                 child->pid = getpid();
 302                 close( child->write_data_fd );
 303                 close( child->read_status_fd );
 304
 305                 /* do the initing */
 306                 if( prefork_child_init_hook(child) == -1 ) {
 307                         osrfLogError(OSRF_LOG_MARK,
 308                                 "Forker child going away because we could not connect to OpenSRF...");
 309                         exit(1);
 310                 }
 311
 312                 prefork_child_wait( child );
 313                 exit(0); /* just to be sure */
 314          }
 315         return NULL;
 316 }
 317
 318
 319 void prefork_launch_children( prefork_simple* forker ) {
 320         if(!forker) return;
 321         int c = 0;
 322         while( c++ < forker->min_children )
 323                 launch_child( forker );
 324 }
 325
 326
 327 void sigchld_handler( int sig ) {
 328         signal(SIGCHLD, sigchld_handler);
 329         child_dead = 1;
 330 }
 331
 332
 333 void reap_children( prefork_simple* forker ) {
 334
 335         pid_t child_pid;
 336         int status;
 337
 338         while( (child_pid=waitpid(-1,&status,WNOHANG)) > 0)
 339                 del_prefork_child( forker, child_pid );
 340
 341         /* replenish */
 342         while( forker->current_num_children < forker->min_children )
 343                 launch_child( forker );
 344
 345         child_dead = 0;
 346 }
 347
 348 void prefork_run(prefork_simple* forker) {
 349
 350         if( forker->first_child == NULL )
 351                 return;
 352
 353         transport_message* cur_msg = NULL;
 354
 355
 356         while(1) {
 357
 358                 if( forker->first_child == NULL ) {/* no more children */
 359                         osrfLogWarning( OSRF_LOG_MARK, "No more children..." );
 360                         return;
 361                 }
 362
 363                 osrfLogDebug( OSRF_LOG_MARK, "Forker going into wait for data...");
 364                 cur_msg = client_recv( forker->connection, -1 );
 365
 366                 //fprintf(stderr, "Got Data %f\n", get_timestamp_millis() );
 367
 368                 if( cur_msg == NULL ) continue;
 369
 370                 int honored = 0;        /* true if we've serviced the request */
 371                 int no_recheck = 0;
 372
 373                 while( ! honored ) {
 374
 375                         if(!no_recheck) check_children( forker, 0 );
 376                         no_recheck = 0;
 377
 378                         osrfLogDebug( OSRF_LOG_MARK,  "Server received inbound data" );
 379                         int k;
 380                         prefork_child* cur_child = forker->first_child;
 381
 382                         /* Look for an available child */
 383                         for( k = 0; k < forker->current_num_children; k++ ) {
 384
 385                                 osrfLogInternal( OSRF_LOG_MARK, "Searching for available child. cur_child->pid = %d", cur_child->pid );
 386                                 osrfLogInternal( OSRF_LOG_MARK, "Current num children %d and loop %d", forker->current_num_children, k);
 387
 388                                 if( cur_child->available ) {
 389                                         osrfLogDebug( OSRF_LOG_MARK,  "forker sending data to %d", cur_child->pid );
 390
 391                                         message_prepare_xml( cur_msg );
 392                                         char* data = cur_msg->msg_xml;
 393                                         if( ! data || strlen(data) < 1 ) break;
 394
 395                                         cur_child->available = 0;
 396                                         osrfLogInternal( OSRF_LOG_MARK,  "Writing to child fd %d", cur_child->write_data_fd );
 397
 398                                         int written = 0;
 399                                         //fprintf(stderr, "Writing Data %f\n", get_timestamp_millis() );
 400                                         if( (written = write( cur_child->write_data_fd, data, strlen(data) + 1 )) < 0 ) {
 401                                                 osrfLogWarning( OSRF_LOG_MARK, "Write returned error %d", errno);
 402                                                 cur_child = cur_child->next;
 403                                                 continue;
 404                                         }
 405
 406                                         //fprintf(stderr, "Wrote %d bytes to child\n", written);
 407
 408                                         forker->first_child = cur_child->next;
 409                                         honored = 1;
 410                                         break;
 411                                 } else
 412                                         cur_child = cur_child->next;
 413                         }
 414
 415                         /* if none available, add a new child if we can */
 416                         if( ! honored ) {
 417                                 osrfLogDebug( OSRF_LOG_MARK, "Not enough children, attempting to add...");
 418                                 if( forker->current_num_children < forker->max_children ) {
 419                                         osrfLogDebug( OSRF_LOG_MARK,  "Launching new child with current_num = %d",
 420                                                         forker->current_num_children );
 421
 422                                         prefork_child* new_child = launch_child( forker );
 423                                         message_prepare_xml( cur_msg );
 424                                         char* data = cur_msg->msg_xml;
 425                                         if( ! data || strlen(data) < 1 ) break;
 426                                         new_child->available = 0;
 427                                         osrfLogDebug( OSRF_LOG_MARK,  "Writing to new child fd %d : pid %d",
 428                                                         new_child->write_data_fd, new_child->pid );
 429                                         write( new_child->write_data_fd, data, strlen(data) + 1 );
 430                                         forker->first_child = new_child->next;
 431                                         honored = 1;
 432                                 }
 433                         }
 434
 435                         if( !honored ) {
 436                                 osrfLogWarning( OSRF_LOG_MARK,  "No children available, waiting...");
 437
 438                                 check_children( forker, 1 );  /* non-poll version */
 439                                 /* tell the loop no to call check_children again, since we're calling it now */
 440                                 no_recheck = 1;
 441                                 //usleep(50000);
 442                         }
 443
 444                         if( child_dead )
 445                                 reap_children(forker);
 446
 447
 448                         //fprintf(stderr, "Parent done with request %f\n", get_timestamp_millis() );
 449
 450                 } // honored?
 451
 452                 message_free( cur_msg );
 453
 454         } /* top level listen loop */
 455
 456 }
 457
 458
 459 /** XXX Add a flag which tells select() to wait forever on children
 460  * in the best case, this will be faster than calling usleep(x), and
 461  * in the worst case it won't be slower and will do less logging...
 462  */
 463
 464 void check_children( prefork_simple* forker, int forever ) {
 465
 466         //check_begin:
 467
 468         int select_ret;
 469         fd_set read_set;
 470         FD_ZERO(&read_set);
 471         int max_fd = 0;
 472         int n;
 473
 474
 475         if( child_dead )
 476                 reap_children(forker);
 477
 478         prefork_child* cur_child = forker->first_child;
 479
 480         int i;
 481         for( i = 0; i!= forker->current_num_children; i++ ) {
 482
 483                 if( cur_child->read_status_fd > max_fd )
 484                         max_fd = cur_child->read_status_fd;
 485                 FD_SET( cur_child->read_status_fd, &read_set );
 486                 cur_child = cur_child->next;
 487         }
 488
 489         FD_CLR(0,&read_set);/* just to be sure */
 490
 491         if( forever ) {
 492                 osrfLogWarning(OSRF_LOG_MARK, "We have no children available - waiting for one to show up...");
 493
 494                 if( (select_ret=select( max_fd + 1 , &read_set, NULL, NULL, NULL)) == -1 ) {
 495                         osrfLogWarning( OSRF_LOG_MARK,  "Select returned error %d on check_children", errno );
 496                 }
 497                 osrfLogInfo(OSRF_LOG_MARK, "select() completed after waiting on children to become available");
 498
 499         } else {
 500
 501                 struct timeval tv;
 502                 tv.tv_sec       = 0;
 503                 tv.tv_usec      = 0;
 504
 505                 if( (select_ret=select( max_fd + 1 , &read_set, NULL, NULL, &tv)) == -1 ) {
 506                         osrfLogWarning( OSRF_LOG_MARK,  "Select returned error %d on check_children", errno );
 507                 }
 508         }
 509
 510         if( select_ret == 0 )
 511                 return;
 512
 513         /* see if one of a child has told us it's done */
 514         cur_child = forker->first_child;
 515         int j;
 516         int num_handled = 0;
 517         for( j = 0; j!= forker->current_num_children && num_handled < select_ret ; j++ ) {
 518
 519                 if( FD_ISSET( cur_child->read_status_fd, &read_set ) ) {
 520                         //printf( "Server received status from a child %d\n", cur_child->pid );
 521                         osrfLogDebug( OSRF_LOG_MARK,  "Server received status from a child %d", cur_child->pid );
 522
 523                         num_handled++;
 524
 525                         /* now suck off the data */
 526                         char buf[64];
 527                         memset( buf, 0, 64);
 528                         if( (n=read(cur_child->read_status_fd, buf, 63))  < 0 ) {
 529                                 osrfLogWarning( OSRF_LOG_MARK, "Read error afer select in child status read with errno %d", errno);
 530                         }
 531
 532                         osrfLogDebug( OSRF_LOG_MARK,  "Read %d bytes from status buffer: %s", n, buf );
 533                         cur_child->available = 1;
 534                 }
 535                 cur_child = cur_child->next;
 536         }
 537
 538 }
 539
 540
 541 void prefork_child_wait( prefork_child* child ) {
 542
 543         int i,n;
 544         growing_buffer* gbuf = buffer_init( READ_BUFSIZE );
 545         char buf[READ_BUFSIZE];
 546         memset( buf, 0, READ_BUFSIZE );
 547
 548         for( i = 0; i < child->max_requests; i++ ) {
 549
 550                 n = -1;
 551                 int gotdata = 0;
 552                 clr_fl(child->read_data_fd, O_NONBLOCK );
 553
 554                 while( (n=read(child->read_data_fd, buf, READ_BUFSIZE-1)) > 0 ) {
 555                         osrfLogDebug(OSRF_LOG_MARK, "Prefork child read %d bytes of data", n);
 556                         if(!gotdata)
 557                                 set_fl(child->read_data_fd, O_NONBLOCK );
 558                         buffer_add( gbuf, buf );
 559                         memset( buf, 0, READ_BUFSIZE );
 560                         gotdata = 1;
 561                 }
 562
 563                 if( errno == EAGAIN ) n = 0;
 564
 565                 if( n < 0 ) {
 566                         osrfLogWarning( OSRF_LOG_MARK,  "Prefork child read returned error with errno %d", errno );
 567                         break;
 568
 569                 } else if( gotdata ) {
 570                         osrfLogDebug(OSRF_LOG_MARK, "Prefork child got a request.. processing..");
 571                         prefork_child_process_request(child, gbuf->buf);
 572                         buffer_reset( gbuf );
 573                 }
 574
 575                 if( i < child->max_requests - 1 )
 576                         write( child->write_status_fd, "available" /*less than 64 bytes*/, 9 );
 577         }
 578
 579         buffer_free(gbuf);
 580
 581         osrfLogDebug( OSRF_LOG_MARK, "Child with max-requests=%d, num-served=%d exiting...[%d]",
 582                         child->max_requests, i, getpid() );
 583
 584         exit(0);
 585 }
 586
 587
 588 void add_prefork_child( prefork_simple* forker, prefork_child* child ) {
 589
 590         if( forker->first_child == NULL ) {
 591                 forker->first_child = child;
 592                 child->next = child;
 593                 return;
 594         }
 595
 596         /* we put the child in as the last because, regardless,
 597                 we have to do the DLL splice dance, and this is the
 598            simplest way */
 599
 600         prefork_child* start_child = forker->first_child;
 601         while(1) {
 602                 if( forker->first_child->next == start_child )
 603                         break;
 604                 forker->first_child = forker->first_child->next;
 605         }
 606
 607         /* here we know that forker->first_child is the last element
 608                 in the list and start_child is the first.  Insert the
 609                 new child between them*/
 610
 611         forker->first_child->next = child;
 612         child->next = start_child;
 613         return;
 614 }
 615
 616 prefork_child* find_prefork_child( prefork_simple* forker, pid_t pid ) {
 617
 618         if( forker->first_child == NULL ) { return NULL; }
 619         prefork_child* start_child = forker->first_child;
 620         do {
 621                 if( forker->first_child->pid == pid )
 622                         return forker->first_child;
 623         } while( (forker->first_child = forker->first_child->next) != start_child );
 624
 625         return NULL;
 626 }
 627
 628
 629 void del_prefork_child( prefork_simple* forker, pid_t pid ) {
 630
 631         if( forker->first_child == NULL ) { return; }
 632
 633         (forker->current_num_children)--;
 634         osrfLogDebug( OSRF_LOG_MARK, "Deleting Child: %d", pid );
 635
 636         prefork_child* start_child = forker->first_child; /* starting point */
 637         prefork_child* cur_child        = start_child; /* current pointer */
 638         prefork_child* prev_child       = start_child; /* the trailing pointer */
 639
 640         /* special case where there is only one in the list */
 641         if( start_child == start_child->next ) {
 642                 if( start_child->pid == pid ) {
 643                         forker->first_child = NULL;
 644
 645                         close( start_child->read_data_fd );
 646                         close( start_child->write_data_fd );
 647                         close( start_child->read_status_fd );
 648                         close( start_child->write_status_fd );
 649
 650                         prefork_child_free( start_child );
 651                 }
 652                 return;
 653         }
 654
 655
 656         /* special case where the first item in the list needs to be removed */
 657         if( start_child->pid == pid ) {
 658
 659                 /* find the last one so we can remove the start_child */
 660                 do {
 661                         prev_child = cur_child;
 662                         cur_child = cur_child->next;
 663                 }while( cur_child != start_child );
 664
 665                 /* now cur_child == start_child */
 666                 prev_child->next = cur_child->next;
 667                 forker->first_child = prev_child;
 668
 669                 close( cur_child->read_data_fd );
 670                 close( cur_child->write_data_fd );
 671                 close( cur_child->read_status_fd );
 672                 close( cur_child->write_status_fd );
 673
 674                 prefork_child_free( cur_child );
 675                 return;
 676         }
 677
 678         do {
 679                 prev_child = cur_child;
 680                 cur_child = cur_child->next;
 681
 682                 if( cur_child->pid == pid ) {
 683                         prev_child->next = cur_child->next;
 684
 685                         close( cur_child->read_data_fd );
 686                         close( cur_child->write_data_fd );
 687                         close( cur_child->read_status_fd );
 688                         close( cur_child->write_status_fd );
 689
 690                         prefork_child_free( cur_child );
 691                         return;
 692                 }
 693
 694         } while(cur_child != start_child);
 695 }
 696
 697
 698
 699
 700 prefork_child* prefork_child_init(
 701         int max_requests, int read_data_fd, int write_data_fd,
 702         int read_status_fd, int write_status_fd ) {
 703
 704         prefork_child* child = (prefork_child*) safe_malloc(sizeof(prefork_child));
 705         child->max_requests             = max_requests;
 706         child->read_data_fd             = read_data_fd;
 707         child->write_data_fd            = write_data_fd;
 708         child->read_status_fd   = read_status_fd;
 709         child->write_status_fd  = write_status_fd;
 710         child->available                        = 1;
 711
 712         return child;
 713 }
 714
 715
 716 int prefork_free( prefork_simple* prefork ) {
 717
 718         while( prefork->first_child != NULL ) {
 719                 osrfLogInfo( OSRF_LOG_MARK,  "Killing children and sleeping 1 to reap..." );
 720                 kill( 0,        SIGKILL );
 721                 sleep(1);
 722         }
 723
 724         client_free(prefork->connection);
 725         free(prefork->appname);
 726         free( prefork );
 727         return 1;
 728 }
 729
 730 int prefork_child_free( prefork_child* child ) {
 731         free(child->appname);
 732         close(child->read_data_fd);
 733         close(child->write_status_fd);
 734         free( child );
 735         return 1;
 736 }
 737