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