code.grnet.gr Git - archipelago/blob - xseg/peers/user/peer.c

   1 /*
   2  * Copyright 2012 GRNET S.A. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or
   5  * without modification, are permitted provided that the following
   6  * conditions are met:
   7  *
   8  *   1. Redistributions of source code must retain the above
   9  *      copyright notice, this list of conditions and the following
  10  *      disclaimer.
  11  *   2. Redistributions in binary form must reproduce the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer in the documentation and/or other materials
  14  *      provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  20  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  26  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * The views and conclusions contained in the software and
  30  * documentation are those of the authors and should not be
  31  * interpreted as representing official policies, either expressed
  32  * or implied, of GRNET S.A.
  33  */
  34
  35 #define _GNU_SOURCE
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <sys/syscall.h>
  41 #include <sys/time.h>
  42 #include <signal.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45 #include <errno.h>
  46
  47 #ifdef MT
  48 #include <pthread.h>
  49 #endif
  50
  51 #include <xseg/xseg.h>
  52 #include <peer.h>
  53
  54 #ifdef MT
  55 #define PEER_TYPE "pthread"
  56 #else
  57 #define PEER_TYPE "posix"
  58 #endif
  59
  60 //FIXME this should not be defined here probably
  61 #define MAX_SPEC_LEN 128
  62 #define MAX_PIDFILE_LEN 512
  63
  64 volatile unsigned int terminated = 0;
  65 unsigned int verbose = 0;
  66 struct log_ctx lc;
  67 #ifdef ST_THREADS
  68 uint32_t ta = 0;
  69 #endif
  70
  71 #ifdef MT
  72 struct peerd *global_peer;
  73
  74 struct thread {
  75         struct peerd *peer;
  76         pthread_t tid;
  77         pthread_cond_t cond;
  78         pthread_mutex_t lock;
  79         void (*func)(void *arg);
  80         void *arg;
  81 };
  82
  83 inline static struct thread* alloc_thread(struct peerd *peer)
  84 {
  85         xqindex idx = xq_pop_head(&peer->threads, 1);
  86         if (idx == Noneidx)
  87                 return NULL;
  88         return peer->thread + idx;
  89 }
  90
  91 inline static void free_thread(struct peerd *peer, struct thread *t)
  92 {
  93         xqindex idx = t - peer->thread;
  94         xq_append_head(&peer->threads, idx, 1);
  95 }
  96
  97
  98 inline static void __wake_up_thread(struct thread *t)
  99 {
 100         pthread_mutex_lock(&t->lock);
 101         pthread_cond_signal(&t->cond);
 102         pthread_mutex_unlock(&t->lock);
 103 }
 104
 105 inline static void wake_up_thread(struct thread* t)
 106 {
 107         if (t){
 108                 __wake_up_thread(t);
 109         }
 110 }
 111
 112 inline static int wake_up_next_thread(struct peerd *peer)
 113 {
 114         return (xseg_signal(peer->xseg, peer->portno_start));
 115 }
 116 #endif
 117
 118 /*
 119  * extern is needed if this function is going to be called by another file
 120  * such as bench-xseg.c
 121  */
 122
 123 void signal_handler(int signal)
 124 {
 125         XSEGLOG2(&lc, I, "Caught signal. Terminating gracefully");
 126         terminated = 1;
 127 #ifdef MT
 128         wake_up_next_thread(global_peer);
 129 #endif
 130 }
 131
 132 void renew_logfile(int signal)
 133 {
 134         XSEGLOG2(&lc, I, "Caught signal. Renewing logfile");
 135         renew_logctx(&lc, NULL, verbose, NULL, REOPEN_FILE);
 136 }
 137
 138 static int setup_signals(struct peerd *peer)
 139 {
 140         int r;
 141         struct sigaction sa;
 142 #ifdef MT
 143         global_peer = peer;
 144 #endif
 145         sigemptyset(&sa.sa_mask);
 146         sa.sa_flags = 0;
 147         sa.sa_handler = signal_handler;
 148         r = sigaction(SIGTERM, &sa, NULL);
 149         if (r < 0)
 150                 return r;
 151         r = sigaction(SIGINT, &sa, NULL);
 152         if (r < 0)
 153                 return r;
 154         r = sigaction(SIGQUIT, &sa, NULL);
 155         if (r < 0)
 156                 return r;
 157
 158         sa.sa_handler = renew_logfile;
 159         r = sigaction(SIGUSR1, &sa, NULL);
 160         if (r < 0)
 161                 return r;
 162
 163         return r;
 164 }
 165
 166 inline int canDefer(struct peerd *peer)
 167 {
 168         return !(peer->defer_portno == NoPort);
 169 }
 170
 171 void print_req(struct xseg *xseg, struct xseg_request *req)
 172 {
 173         char target[64], data[64];
 174         char *req_target, *req_data;
 175         unsigned int end = (req->targetlen> 63) ? 63 : req->targetlen;
 176         req_target = xseg_get_target(xseg, req);
 177         req_data = xseg_get_data(xseg, req);
 178
 179         if (1) {
 180                 strncpy(target, req_target, end);
 181                 target[end] = 0;
 182                 strncpy(data, req_data, 63);
 183                 data[63] = 0;
 184                 printf("req id:%lu, op:%u %llu:%lu serviced: %lu, reqstate: %u\n"
 185                                 "src: %u, transit: %u, dst: %u effective dst: %u\n"
 186                                 "target[%u]:'%s', data[%llu]:\n%s------------------\n\n",
 187                                 (unsigned long)(req),
 188                                 (unsigned int)req->op,
 189                                 (unsigned long long)req->offset,
 190                                 (unsigned long)req->size,
 191                                 (unsigned long)req->serviced,
 192                                 (unsigned int)req->state,
 193                                 (unsigned int)req->src_portno,
 194                                 (unsigned int)req->transit_portno,
 195                                 (unsigned int)req->dst_portno,
 196                                 (unsigned int)req->effective_dst_portno,
 197                                 (unsigned int)req->targetlen, target,
 198                                 (unsigned long long)req->datalen, data);
 199         }
 200 }
 201 void log_pr(char *msg, struct peer_req *pr)
 202 {
 203         char target[64], data[64];
 204         char *req_target, *req_data;
 205         struct peerd *peer = pr->peer;
 206         struct xseg *xseg = pr->peer->xseg;
 207         req_target = xseg_get_target(xseg, pr->req);
 208         req_data = xseg_get_data(xseg, pr->req);
 209         /* null terminate name in case of req->target is less than 63 characters,
 210          * and next character after name (aka first byte of next buffer) is not
 211          * null
 212          */
 213         unsigned int end = (pr->req->targetlen> 63) ? 63 : pr->req->targetlen;
 214         if (verbose) {
 215                 strncpy(target, req_target, end);
 216                 target[end] = 0;
 217                 strncpy(data, req_data, 63);
 218                 data[63] = 0;
 219                 printf("%s: req id:%u, op:%u %llu:%lu serviced: %lu, retval: %lu, reqstate: %u\n"
 220                                 "target[%u]:'%s', data[%llu]:\n%s------------------\n\n",
 221                                 msg,
 222                                 (unsigned int)(pr - peer->peer_reqs),
 223                                 (unsigned int)pr->req->op,
 224                                 (unsigned long long)pr->req->offset,
 225                                 (unsigned long)pr->req->size,
 226                                 (unsigned long)pr->req->serviced,
 227                                 (unsigned long)pr->retval,
 228                                 (unsigned int)pr->req->state,
 229                                 (unsigned int)pr->req->targetlen, target,
 230                                 (unsigned long long)pr->req->datalen, data);
 231         }
 232 }
 233
 234 inline struct peer_req *alloc_peer_req(struct peerd *peer)
 235 {
 236         xqindex idx = xq_pop_head(&peer->free_reqs, 1);
 237         if (idx == Noneidx)
 238                 return NULL;
 239         return peer->peer_reqs + idx;
 240 }
 241
 242 inline void free_peer_req(struct peerd *peer, struct peer_req *pr)
 243 {
 244         xqindex idx = pr - peer->peer_reqs;
 245         pr->req = NULL;
 246         xq_append_head(&peer->free_reqs, idx, 1);
 247 }
 248
 249 struct timeval resp_start, resp_end, resp_accum = {0, 0};
 250 uint64_t responds = 0;
 251 void get_responds_stats(){
 252                 printf("Time waiting respond %lu.%06lu sec for %llu times.\n",
 253                                 //(unsigned int)(t - peer->thread),
 254                                 resp_accum.tv_sec, resp_accum.tv_usec, (long long unsigned int) responds);
 255 }
 256
 257 //FIXME error check
 258 void fail(struct peerd *peer, struct peer_req *pr)
 259 {
 260         struct xseg_request *req = pr->req;
 261         uint32_t p;
 262         XSEGLOG2(&lc, D, "failing req %u", (unsigned int) (pr - peer->peer_reqs));
 263         req->state |= XS_FAILED;
 264         //xseg_set_req_data(peer->xseg, pr->req, NULL);
 265         p = xseg_respond(peer->xseg, req, pr->portno, X_ALLOC);
 266         xseg_signal(peer->xseg, p);
 267         free_peer_req(peer, pr);
 268 #ifdef MT
 269         wake_up_next_thread(peer);
 270 #endif
 271 }
 272
 273 //FIXME error check
 274 void complete(struct peerd *peer, struct peer_req *pr)
 275 {
 276         struct xseg_request *req = pr->req;
 277         uint32_t p;
 278         req->state |= XS_SERVED;
 279         //xseg_set_req_data(peer->xseg, pr->req, NULL);
 280         //gettimeofday(&resp_start, NULL);
 281         p = xseg_respond(peer->xseg, req, pr->portno, X_ALLOC);
 282         //gettimeofday(&resp_end, NULL);
 283         //responds++;
 284         //timersub(&resp_end, &resp_start, &resp_end);
 285         //timeradd(&resp_end, &resp_accum, &resp_accum);
 286         //printf("xseg_signal: %u\n", p);
 287         xseg_signal(peer->xseg, p);
 288         free_peer_req(peer, pr);
 289 #ifdef MT
 290         wake_up_next_thread(peer);
 291 #endif
 292 }
 293
 294 static void handle_accepted(struct peerd *peer, struct peer_req *pr,
 295                                 struct xseg_request *req)
 296 {
 297         struct xseg_request *xreq = pr->req;
 298         //assert xreq == req;
 299         XSEGLOG2(&lc, D, "Handle accepted");
 300         xreq->serviced = 0;
 301         //xreq->state = XS_ACCEPTED;
 302         pr->retval = 0;
 303         dispatch(peer, pr, req, dispatch_accept);
 304 }
 305
 306 static void handle_received(struct peerd *peer, struct peer_req *pr,
 307                                 struct xseg_request *req)
 308 {
 309         //struct xseg_request *req = pr->req;
 310         //assert req->state != XS_ACCEPTED;
 311         XSEGLOG2(&lc, D, "Handle received \n");
 312         dispatch(peer, pr, req, dispatch_receive);
 313
 314 }
 315 struct timeval sub_start, sub_end, sub_accum = {0, 0};
 316 uint64_t submits = 0;
 317 void get_submits_stats(){
 318                 printf("Time waiting submit %lu.%06lu sec for %llu times.\n",
 319                                 //(unsigned int)(t - peer->thread),
 320                                 sub_accum.tv_sec, sub_accum.tv_usec, (long long unsigned int) submits);
 321 }
 322
 323 int submit_peer_req(struct peerd *peer, struct peer_req *pr)
 324 {
 325         uint32_t ret;
 326         struct xseg_request *req = pr->req;
 327         // assert req->portno == peer->portno ?
 328         //TODO small function with error checking
 329         XSEGLOG2 (&lc, D, "submitting peer req %u\n", (unsigned int)(pr - peer->peer_reqs));
 330         ret = xseg_set_req_data(peer->xseg, req, (void *)(pr));
 331         if (ret < 0)
 332                 return -1;
 333         //printf("pr: %x , req_data: %x \n", pr, xseg_get_req_data(peer->xseg, req));
 334         //gettimeofday(&sub_start, NULL);
 335         ret = xseg_submit(peer->xseg, req, pr->portno, X_ALLOC);
 336         //gettimeofday(&sub_end, NULL);
 337         //submits++;
 338         //timersub(&sub_end, &sub_start, &sub_end);
 339         //timeradd(&sub_end, &sub_accum, &sub_accum);
 340         if (ret == NoPort)
 341                 return -1;
 342         xseg_signal(peer->xseg, ret);
 343         return 0;
 344 }
 345
 346 int check_ports(struct peerd *peer)
 347 {
 348         struct xseg *xseg = peer->xseg;
 349         xport portno_start = peer->portno_start;
 350         xport portno_end = peer->portno_end;
 351         struct xseg_request *accepted, *received;
 352         struct peer_req *pr;
 353         xport i;
 354         int  r, c = 0;
 355
 356         for (i = portno_start; i <= portno_end; i++) {
 357                 accepted = NULL;
 358                 received = NULL;
 359                 if (!isTerminate()) {
 360                         pr = alloc_peer_req(peer);
 361                         if (pr) {
 362                                 accepted = xseg_accept(xseg, i, X_NONBLOCK);
 363                                 if (accepted) {
 364                                         pr->req = accepted;
 365                                         pr->portno = i;
 366                                         xseg_cancel_wait(xseg, i);
 367                                         handle_accepted(peer, pr, accepted);
 368                                         c = 1;
 369                                 }
 370                                 else {
 371                                         free_peer_req(peer, pr);
 372                                 }
 373                         }
 374                 }
 375                 received = xseg_receive(xseg, i, X_NONBLOCK);
 376                 if (received) {
 377                         r =  xseg_get_req_data(xseg, received, (void **) &pr);
 378                         if (r < 0 || !pr){
 379                                 XSEGLOG2(&lc, W, "Received request with no pr data\n");
 380                                 xport p = xseg_respond(peer->xseg, received, peer->portno_start, X_ALLOC);
 381                                 if (p == NoPort){
 382                                         XSEGLOG2(&lc, W, "Could not respond stale request");
 383                                         xseg_put_request(xseg, received, portno_start);
 384                                         continue;
 385                                 } else {
 386                                         xseg_signal(xseg, p);
 387                                 }
 388                         } else {
 389                                 //maybe perform sanity check for pr
 390                                 xseg_cancel_wait(xseg, i);
 391                                 handle_received(peer, pr, received);
 392                                 c = 1;
 393                         }
 394                 }
 395         }
 396
 397         return c;
 398 }
 399
 400 #ifdef MT
 401 static int peerd_loop(void *arg);
 402
 403 static void* thread_loop(void *arg)
 404 {
 405         struct thread *t = (struct thread *) arg;
 406         struct peerd *peer = t->peer;
 407         struct xseg *xseg = peer->xseg;
 408         xport portno_start = peer->portno_start;
 409         xport portno_end = peer->portno_end;
 410         pid_t pid =syscall(SYS_gettid);
 411         uint64_t loops;
 412         uint64_t threshold=1000/(1 + portno_end - portno_start);
 413
 414         XSEGLOG2(&lc, D, "thread %u\n",  (unsigned int) (t- peer->thread));
 415         XSEGLOG2(&lc, I, "Thread %u has tid %u.\n", (unsigned int) (t- peer->thread), pid);
 416         xseg_init_local_signal(xseg, peer->portno_start);
 417         for (;!(isTerminate() && xq_count(&peer->free_reqs) == peer->nr_ops);) {
 418                 for(loops =  threshold; loops > 0; loops--) {
 419                         if (loops == 1)
 420                                 xseg_prepare_wait(xseg, peer->portno_start);
 421                         if (check_ports(peer))
 422                                 loops = threshold;
 423                 }
 424                 XSEGLOG2(&lc, I, "Thread %u goes to sleep\n", (unsigned int) (t- peer->thread));
 425                 xseg_wait_signal(xseg, 10000000UL);
 426                 xseg_cancel_wait(xseg, peer->portno_start);
 427                 XSEGLOG2(&lc, I, "Thread %u woke up\n", (unsigned int) (t- peer->thread));
 428         }
 429         wake_up_next_thread(peer);
 430         custom_peer_finalize(peer);
 431         return NULL;
 432 }
 433
 434 int peerd_start_threads(struct peerd *peer)
 435 {
 436         int i;
 437         uint32_t nr_threads = peer->nr_threads;
 438         //TODO err check
 439         for (i = 0; i < nr_threads; i++) {
 440                 peer->thread[i].peer = peer;
 441                 pthread_cond_init(&peer->thread[i].cond,NULL);
 442                 pthread_mutex_init(&peer->thread[i].lock, NULL);
 443                 if (peer->custom_peerd_loop)
 444                         pthread_create(&peer->thread[i].tid, NULL, peer->custom_peerd_loop, (void *)(peer->thread + i));
 445                 else
 446                         pthread_create(&peer->thread[i].tid, NULL, peerd_loop, (void *)(peer->thread + i));
 447                 peer->thread[i].func = NULL;
 448                 peer->thread[i].arg = NULL;
 449         }
 450
 451         if (peer->interactive_func)
 452                 peer->interactive_func();
 453         for (i = 0; i < nr_threads; i++) {
 454                 pthread_join(peer->thread[i].tid, NULL);
 455         }
 456
 457         return 0;
 458 }
 459 #endif
 460
 461
 462 int defer_request(struct peerd *peer, struct peer_req *pr)
 463 {
 464         int r;
 465         xport p;
 466         if (!canDefer(peer)){
 467                 XSEGLOG2(&lc, E, "Peer cannot defer requests");
 468                 return -1;
 469         }
 470         p = xseg_forward(peer->xseg, pr->req, peer->defer_portno, pr->portno,
 471                         X_ALLOC);
 472         if (p == NoPort){
 473                 XSEGLOG2(&lc, E, "Cannot defer request %lx", pr->req);
 474                 return -1;
 475         }
 476         r = xseg_signal(peer->xseg, p);
 477         if (r < 0) {
 478                 XSEGLOG2(&lc, W, "Cannot signal port %lu", p);
 479         }
 480         free_peer_req(peer, pr);
 481         return 0;
 482 }
 483
 484 static int peerd_loop(void *arg)
 485 {
 486 #ifdef MT
 487         struct thread *t = (struct thread *) arg;
 488         struct peerd *peer = t->peer;
 489 #else
 490         struct peerd *peer = (struct peerd *) arg;
 491 #endif
 492         struct xseg *xseg = peer->xseg;
 493         xport portno_start = peer->portno_start;
 494         xport portno_end = peer->portno_end;
 495         pid_t pid =syscall(SYS_gettid);
 496         uint64_t threshold=1000/(1 + portno_end - portno_start);
 497         uint64_t loops;
 498
 499         XSEGLOG2(&lc, I, "Peer has tid %u.\n", pid);
 500         xseg_init_local_signal(xseg, peer->portno_start);
 501         for (;!(isTerminate() && xq_count(&peer->free_reqs) == peer->nr_ops);) {
 502                 for(loops= threshold; loops > 0; loops--) {
 503                         if (loops == 1)
 504                                 xseg_prepare_wait(xseg, peer->portno_start);
 505                         if (check_ports(peer))
 506                                 loops = threshold;
 507                 }
 508 #ifdef ST_THREADS
 509                 if (ta){
 510                         st_sleep(0);
 511                         continue;
 512                 }
 513 #endif
 514                 XSEGLOG2(&lc, I, "Peer goes to sleep\n");
 515                 xseg_wait_signal(xseg, 10000000UL);
 516                 xseg_cancel_wait(xseg, peer->portno_start);
 517                 XSEGLOG2(&lc, I, "Peer woke up\n");
 518         }
 519 #ifdef MT
 520         wake_up_next_thread(peer);
 521         custom_peer_finalize(peer);
 522 #else
 523         custom_peer_finalize(peer);
 524         xseg_quit_local_signal(xseg, peer->portno_start);
 525 #endif
 526         return 0;
 527 }
 528
 529 static struct xseg *join(char *spec)
 530 {
 531         struct xseg_config config;
 532         struct xseg *xseg;
 533
 534         (void)xseg_parse_spec(spec, &config);
 535         xseg = xseg_join(config.type, config.name, PEER_TYPE, NULL);
 536         if (xseg)
 537                 return xseg;
 538
 539         (void)xseg_create(&config);
 540         return xseg_join(config.type, config.name, PEER_TYPE, NULL);
 541 }
 542
 543 static struct peerd* peerd_init(uint32_t nr_ops, char* spec, long portno_start,
 544                         long portno_end, uint32_t nr_threads, xport defer_portno)
 545 {
 546         int i;
 547         struct peerd *peer;
 548         struct xseg_port *port;
 549
 550 #ifdef ST_THREADS
 551         st_init();
 552 #endif
 553         peer = malloc(sizeof(struct peerd));
 554         if (!peer) {
 555                 perror("malloc");
 556                 return NULL;
 557         }
 558         peer->nr_ops = nr_ops;
 559         peer->defer_portno = defer_portno;
 560 #ifdef MT
 561         peer->nr_threads = nr_threads;
 562         peer->thread = calloc(nr_threads, sizeof(struct thread));
 563         if (!peer->thread)
 564                 goto malloc_fail;
 565 #endif
 566         peer->peer_reqs = calloc(nr_ops, sizeof(struct peer_req));
 567         if (!peer->peer_reqs){
 568 malloc_fail:
 569                 perror("malloc");
 570                 return NULL;
 571         }
 572
 573         if (!xq_alloc_seq(&peer->free_reqs, nr_ops, nr_ops))
 574                 goto malloc_fail;
 575 #ifdef MT
 576         if (!xq_alloc_empty(&peer->threads, nr_threads))
 577                 goto malloc_fail;
 578 #endif
 579         if (xseg_initialize()){
 580                 printf("cannot initialize library\n");
 581                 return NULL;
 582         }
 583         peer->xseg = join(spec);
 584         if (!peer->xseg)
 585                 return NULL;
 586
 587         peer->portno_start = (xport) portno_start;
 588         peer->portno_end= (xport) portno_end;
 589         port = xseg_bind_port(peer->xseg, peer->portno_start, NULL);
 590         if (!port){
 591                 printf("cannot bind to port %u\n", (unsigned int) peer->portno_start);
 592                 return NULL;
 593         }
 594
 595         xport p;
 596         for (p = peer->portno_start + 1; p <= peer->portno_end; p++) {
 597                 struct xseg_port *tmp;
 598                 tmp = xseg_bind_port(peer->xseg, p, (void *)xseg_get_signal_desc(peer->xseg, port));
 599                 if (!tmp){
 600                         printf("cannot bind to port %u\n", (unsigned int) p);
 601                         return NULL;
 602                 }
 603         }
 604
 605         printf("Peer on ports  %u-%u\n", peer->portno_start,
 606                         peer->portno_end);
 607
 608         for (i = 0; i < nr_ops; i++) {
 609                 peer->peer_reqs[i].peer = peer;
 610                 peer->peer_reqs[i].req = NULL;
 611                 peer->peer_reqs[i].retval = 0;
 612                 peer->peer_reqs[i].priv = NULL;
 613                 peer->peer_reqs[i].portno = NoPort;
 614 #ifdef ST_THREADS
 615                 peer->peer_reqs[i].cond = st_cond_new(); //FIXME err check
 616 #endif
 617         }
 618 #ifdef MT
 619         peer->interactive_func = NULL;
 620 #endif
 621         return peer;
 622 }
 623
 624 int pidfile_remove(char *path, int fd)
 625 {
 626         close(fd);
 627         return (unlink(path));
 628 }
 629
 630 int pidfile_write(int pid_fd)
 631 {
 632         char buf[16];
 633         snprintf(buf, sizeof(buf), "%ld", syscall(SYS_gettid));
 634         buf[15] = 0;
 635
 636         lseek(pid_fd, 0, SEEK_SET);
 637         int ret = write(pid_fd, buf, strlen(buf));
 638         return ret;
 639 }
 640
 641 int pidfile_read(char *path, pid_t *pid)
 642 {
 643         char buf[16], *endptr;
 644         *pid = 0;
 645
 646         int fd = open(path, O_RDONLY);
 647         if (fd < 0)
 648                 return -1;
 649         int ret = read(fd, buf, 15);
 650         buf[15]=0;
 651         close(fd);
 652         if (ret < 0)
 653                 return -1;
 654         else{
 655                 *pid = strtol(buf, &endptr, 10);
 656                 if (endptr != &buf[ret]){
 657                         *pid = 0;
 658                         return -1;
 659                 }
 660         }
 661         return 0;
 662 }
 663
 664 int pidfile_open(char *path, pid_t *old_pid)
 665 {
 666         //nfs version > 3
 667         int fd = open(path, O_CREAT|O_EXCL|O_WRONLY, S_IWUSR);
 668         if (fd < 0){
 669                 if (errno == EEXIST)
 670                         pidfile_read(path, old_pid);
 671         }
 672         return fd;
 673 }
 674
 675 void usage(char *argv0)
 676 {
 677         fprintf(stderr, "Usage: %s [general options] [custom peer options]\n\n", argv0);
 678         fprintf(stderr, "General peer options:\n"
 679                 "  Option      | Default | \n"
 680                 "  --------------------------------------------\n"
 681                 "    -g        | None    | Segment spec to join\n"
 682                 "    -sp       | NoPort  | Start portno to bind\n"
 683                 "    -ep       | NoPort  | End portno to bind\n"
 684                 "    -p        | NoPort  | Portno to bind\n"
 685                 "    -n        | 16      | Number of ops\n"
 686                 "    -v        | 0       | Verbosity level\n"
 687                 "    -l        | None    | Logfile \n"
 688                 "    -d        | No      | Daemonize \n"
 689                 "    --pidfile | None    | Pidfile \n"
 690 #ifdef MT
 691                 "    -t        | No      | Number of threads \n"
 692 #endif
 693                 "\n"
 694                );
 695         custom_peer_usage();
 696 }
 697
 698 int main(int argc, char *argv[])
 699 {
 700         struct peerd *peer = NULL;
 701         //parse args
 702         int r;
 703         long portno_start = -1, portno_end = -1, portno = -1;
 704
 705         //set defaults here
 706         int daemonize = 0, help = 0;
 707         uint32_t nr_ops = 16;
 708         uint32_t nr_threads = 1;
 709         unsigned int debug_level = 0;
 710         xport defer_portno = NoPort;
 711         pid_t old_pid;
 712         int pid_fd = -1;
 713
 714         char spec[MAX_SPEC_LEN + 1];
 715         char logfile[MAX_LOGFILE_LEN + 1];
 716         char pidfile[MAX_PIDFILE_LEN + 1];
 717
 718         logfile[0] = 0;
 719         pidfile[0] = 0;
 720         spec[0] = 0;
 721
 722         //capture here -g spec, -n nr_ops, -p portno, -t nr_threads -v verbose level
 723         // -dp xseg_portno to defer blocking requests
 724         // -l log file ?
 725         //TODO print messages on arg parsing error
 726         BEGIN_READ_ARGS(argc, argv);
 727         READ_ARG_STRING("-g", spec, MAX_SPEC_LEN);
 728         READ_ARG_ULONG("-sp", portno_start);
 729         READ_ARG_ULONG("-ep", portno_end);
 730         READ_ARG_ULONG("-p", portno);
 731         READ_ARG_ULONG("-n", nr_ops);
 732         READ_ARG_ULONG("-v", debug_level);
 733 #ifdef MT
 734         READ_ARG_ULONG("-t", nr_threads);
 735 #endif
 736         READ_ARG_ULONG("-dp", defer_portno);
 737         READ_ARG_STRING("-l", logfile, MAX_LOGFILE_LEN);
 738         READ_ARG_BOOL("-d", daemonize);
 739         READ_ARG_BOOL("-h", help);
 740         READ_ARG_BOOL("--help", help);
 741         READ_ARG_STRING("--pidfile", pidfile, MAX_PIDFILE_LEN);
 742         END_READ_ARGS();
 743
 744         if (help){
 745                 usage(argv[0]);
 746                 return 0;
 747         }
 748
 749         r = init_logctx(&lc, argv[0], debug_level, logfile,
 750                         REDIRECT_STDOUT|REDIRECT_STDERR);
 751         if (r < 0){
 752                 XSEGLOG("Cannot initialize logging to logfile");
 753                 return -1;
 754         }
 755         XSEGLOG2(&lc, D, "Main thread has tid %ld.\n", syscall(SYS_gettid));
 756
 757         if (pidfile[0]){
 758                 pid_fd = pidfile_open(pidfile, &old_pid);
 759                 if (pid_fd < 0) {
 760                         if (old_pid) {
 761                                 XSEGLOG2(&lc, E, "Daemon already running, pid: %d.", old_pid);
 762                         } else {
 763                                 XSEGLOG2(&lc, E, "Cannot open or create pidfile");
 764                         }
 765                         return -1;
 766                 }
 767         }
 768
 769         if (daemonize){
 770                 if (daemon(0, 1) < 0){
 771                         XSEGLOG2(&lc, E, "Cannot daemonize");
 772                         r = -1;
 773                         goto out;
 774                 }
 775         }
 776
 777         pidfile_write(pid_fd);
 778
 779         //TODO perform argument sanity checks
 780         verbose = debug_level;
 781         if (portno != -1) {
 782                 portno_start = portno;
 783                 portno_end = portno;
 784         }
 785         if (portno_start == -1 || portno_end == -1){
 786                 XSEGLOG2(&lc, E, "Portno or {portno_start, portno_end} must be supplied");
 787                 usage(argv[0]);
 788                 r = -1;
 789                 goto out;
 790         }
 791
 792         peer = peerd_init(nr_ops, spec, portno_start, portno_end, nr_threads, defer_portno);
 793         if (!peer){
 794                 r = -1;
 795                 goto out;
 796         }
 797         setup_signals(peer);
 798         r = custom_peer_init(peer, argc, argv);
 799         if (r < 0)
 800                 goto out;
 801 #if defined(MT)
 802         //TODO err check
 803         peerd_start_threads(peer);
 804 #elif defined(ST_THREADS)
 805         st_thread_t st = st_thread_create(peerd_loop, peer, 1, 0);
 806         r = st_thread_join(st, NULL);
 807 #else
 808         if (peer->custom_peerd_loop)
 809                 r = peer->custom_peerd_loop(peer);
 810         else
 811                 r = peerd_loop(peer);
 812 #endif
 813 out:
 814         if (pid_fd > 0)
 815                 pidfile_remove(pidfile, pid_fd);
 816         return r;
 817 }