client.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <limits.h>
   5 #include <errno.h>
   6 #include <fcntl.h>
   7 #include <sys/poll.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/socket.h>
  12 #include <sys/un.h>
  13 #include <netinet/in.h>
  14 #include <arpa/inet.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17
  18 #include "fio.h"
  19 #include "server.h"
  20 #include "flist.h"
  21 #include "hash.h"
  22
  23 struct fio_client {
  24         struct flist_head list;
  25         struct flist_head fd_hash_list;
  26         struct flist_head name_hash_list;
  27         struct sockaddr_in addr;
  28         struct sockaddr_un addr_un;
  29         char *hostname;
  30         int fd;
  31
  32         int state;
  33         int skip_newline;
  34         int is_sock;
  35
  36         uint16_t argc;
  37         char **argv;
  38 };
  39
  40 enum {
  41         Client_created          = 0,
  42         Client_connected        = 1,
  43         Client_started          = 2,
  44         Client_stopped          = 3,
  45         Client_exited           = 4,
  46 };
  47
  48 static FLIST_HEAD(client_list);
  49
  50 #define FIO_CLIENT_HASH_BITS    7
  51 #define FIO_CLIENT_HASH_SZ      (1 << FIO_CLIENT_HASH_BITS)
  52 #define FIO_CLIENT_HASH_MASK    (FIO_CLIENT_HASH_SZ - 1)
  53 static struct flist_head client_fd_hash[FIO_CLIENT_HASH_SZ];
  54 static struct flist_head client_name_hash[FIO_CLIENT_HASH_SZ];
  55
  56 static int handle_client(struct fio_client *client);
  57
  58 static void fio_client_add_fd_hash(struct fio_client *client)
  59 {
  60         int bucket = hash_long(client->fd, FIO_CLIENT_HASH_BITS);
  61
  62         bucket &= FIO_CLIENT_HASH_MASK;
  63         flist_add(&client->fd_hash_list, &client_fd_hash[bucket]);
  64 }
  65
  66 static void fio_client_remove_fd_hash(struct fio_client *client)
  67 {
  68         if (!flist_empty(&client->fd_hash_list))
  69                 flist_del_init(&client->fd_hash_list);
  70 }
  71
  72 static void fio_client_add_name_hash(struct fio_client *client)
  73 {
  74         int bucket = jhash(client->hostname, strlen(client->hostname), 0);
  75
  76         bucket &= FIO_CLIENT_HASH_MASK;
  77         flist_add(&client->name_hash_list, &client_name_hash[bucket]);
  78 }
  79
  80 static void fio_client_remove_name_hash(struct fio_client *client)
  81 {
  82         if (!flist_empty(&client->name_hash_list))
  83                 flist_del_init(&client->name_hash_list);
  84 }
  85
  86 static void fio_init fio_client_hash_init(void)
  87 {
  88         int i;
  89
  90         for (i = 0; i < FIO_CLIENT_HASH_SZ; i++) {
  91                 INIT_FLIST_HEAD(&client_fd_hash[i]);
  92                 INIT_FLIST_HEAD(&client_name_hash[i]);
  93         }
  94 }
  95
  96 static struct fio_client *find_client_by_fd(int fd)
  97 {
  98         int bucket = hash_long(fd, FIO_CLIENT_HASH_BITS) & FIO_CLIENT_HASH_MASK;
  99         struct fio_client *client;
 100         struct flist_head *entry;
 101
 102         flist_for_each(entry, &client_fd_hash[bucket]) {
 103                 client = flist_entry(entry, struct fio_client, fd_hash_list);
 104
 105                 if (client->fd == fd)
 106                         return client;
 107         }
 108
 109         return NULL;
 110 }
 111
 112 static struct fio_client *find_client_by_name(const char *name)
 113 {
 114         int bucket = jhash(name, strlen(name), 0) & FIO_CLIENT_HASH_BITS;
 115         struct fio_client *client;
 116         struct flist_head *entry;
 117
 118         flist_for_each(entry, &client_name_hash[bucket]) {
 119                 client = flist_entry(entry, struct fio_client, name_hash_list);
 120
 121                 if (!strcmp(name, client->hostname))
 122                         return client;
 123         }
 124
 125         return NULL;
 126 }
 127
 128 static void remove_client(struct fio_client *client)
 129 {
 130         dprint(FD_NET, "client: removed <%s>\n", client->hostname);
 131         flist_del(&client->list);
 132
 133         fio_client_remove_fd_hash(client);
 134         fio_client_remove_name_hash(client);
 135
 136         free(client->hostname);
 137         if (client->argv)
 138                 free(client->argv);
 139
 140         free(client);
 141         nr_clients--;
 142 }
 143
 144 static int __fio_client_add_cmd_option(struct fio_client *client,
 145                                        const char *opt)
 146 {
 147         int index;
 148
 149         if (client->argc == FIO_NET_CMD_JOBLINE_ARGV) {
 150                 log_err("fio: max cmd line number reached.\n");
 151                 log_err("fio: cmd line <%s> has been ignored.\n", opt);
 152                 return 1;
 153         }
 154
 155         index = client->argc++;
 156         client->argv = realloc(client->argv, sizeof(char *) * client->argc);
 157         client->argv[index] = strdup(opt);
 158         dprint(FD_NET, "client: add cmd %d: %s\n", index, opt);
 159         return 0;
 160 }
 161
 162 int fio_client_add_cmd_option(const char *hostname, const char *opt)
 163 {
 164         struct fio_client *client;
 165
 166         if (!hostname || !opt)
 167                 return 0;
 168
 169         client = find_client_by_name(hostname);
 170         if (!client) {
 171                 log_err("fio: unknown client %s\n", hostname);
 172                 return 1;
 173         }
 174
 175         return __fio_client_add_cmd_option(client, opt);
 176 }
 177
 178 void fio_client_add(const char *hostname)
 179 {
 180         struct fio_client *client;
 181
 182         dprint(FD_NET, "client: added  <%s>\n", hostname);
 183         client = malloc(sizeof(*client));
 184         memset(client, 0, sizeof(*client));
 185
 186         INIT_FLIST_HEAD(&client->list);
 187         INIT_FLIST_HEAD(&client->fd_hash_list);
 188         INIT_FLIST_HEAD(&client->name_hash_list);
 189
 190         if (!strncmp(hostname, "sock:", 5)) {
 191                 client->hostname = strdup(hostname + 5);
 192                 client->is_sock = 1;
 193         } else
 194                 client->hostname = strdup(hostname);
 195
 196         client->fd = -1;
 197
 198         fio_client_add_name_hash(client);
 199
 200         __fio_client_add_cmd_option(client, "fio");
 201
 202         flist_add(&client->list, &client_list);
 203         nr_clients++;
 204 }
 205
 206 static int fio_client_connect_ip(struct fio_client *client)
 207 {
 208         int fd;
 209
 210         client->addr.sin_family = AF_INET;
 211         client->addr.sin_port = htons(fio_net_port);
 212
 213         if (inet_aton(client->hostname, &client->addr.sin_addr) != 1) {
 214                 struct hostent *hent;
 215
 216                 hent = gethostbyname(client->hostname);
 217                 if (!hent) {
 218                         log_err("fio: gethostbyname: %s\n", strerror(errno));
 219                         log_err("fio: failed looking up hostname %s\n",
 220                                         client->hostname);
 221                         return -1;
 222                 }
 223
 224                 memcpy(&client->addr.sin_addr, hent->h_addr, 4);
 225         }
 226
 227         fd = socket(AF_INET, SOCK_STREAM, 0);
 228         if (fd < 0) {
 229                 log_err("fio: socket: %s\n", strerror(errno));
 230                 return -1;
 231         }
 232
 233         if (connect(fd, (struct sockaddr *) &client->addr, sizeof(client->addr)) < 0) {
 234                 log_err("fio: connect: %s\n", strerror(errno));
 235                 log_err("fio: failed to connect to %s\n", client->hostname);
 236                 return -1;
 237         }
 238
 239         return fd;
 240 }
 241
 242 static int fio_client_connect_sock(struct fio_client *client)
 243 {
 244         struct sockaddr_un *addr = &client->addr_un;
 245         fio_socklen_t len;
 246         int fd;
 247
 248         memset(addr, 0, sizeof(*addr));
 249         addr->sun_family = AF_UNIX;
 250         strcpy(addr->sun_path, client->hostname);
 251
 252         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 253         if (fd < 0) {
 254                 log_err("fio: socket: %s\n", strerror(errno));
 255                 return -1;
 256         }
 257
 258         len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
 259         if (connect(fd, (struct sockaddr *) addr, len) < 0) {
 260                 log_err("fio: connect; %s\n", strerror(errno));
 261                 return -1;
 262         }
 263
 264         return fd;
 265 }
 266
 267 static int fio_client_connect(struct fio_client *client)
 268 {
 269         int fd;
 270
 271         dprint(FD_NET, "client: connect to host %s\n", client->hostname);
 272
 273         memset(&client->addr, 0, sizeof(client->addr));
 274
 275         if (client->is_sock)
 276                 fd = fio_client_connect_sock(client);
 277         else
 278                 fd = fio_client_connect_ip(client);
 279
 280         if (fd < 0)
 281                 return 1;
 282
 283         client->fd = fd;
 284         fio_client_add_fd_hash(client);
 285         client->state = Client_connected;
 286         return 0;
 287 }
 288
 289 void fio_clients_terminate(void)
 290 {
 291         struct flist_head *entry;
 292         struct fio_client *client;
 293
 294         dprint(FD_NET, "client: terminate clients\n");
 295
 296         flist_for_each(entry, &client_list) {
 297                 client = flist_entry(entry, struct fio_client, list);
 298
 299                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_QUIT, 0);
 300         }
 301 }
 302
 303 static void sig_int(int sig)
 304 {
 305         dprint(FD_NET, "client: got sign %d\n", sig);
 306         fio_clients_terminate();
 307 }
 308
 309 static void client_signal_handler(void)
 310 {
 311         struct sigaction act;
 312
 313         memset(&act, 0, sizeof(act));
 314         act.sa_handler = sig_int;
 315         act.sa_flags = SA_RESTART;
 316         sigaction(SIGINT, &act, NULL);
 317
 318         memset(&act, 0, sizeof(act));
 319         act.sa_handler = sig_int;
 320         act.sa_flags = SA_RESTART;
 321         sigaction(SIGTERM, &act, NULL);
 322 }
 323
 324 static void probe_client(struct fio_client *client)
 325 {
 326         dprint(FD_NET, "client: send probe\n");
 327
 328         fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_PROBE, 0);
 329         handle_client(client);
 330 }
 331
 332 static int send_client_cmd_line(struct fio_client *client)
 333 {
 334         struct cmd_line_pdu *pdu;
 335         int i, ret;
 336
 337         dprint(FD_NET, "client: send cmdline %d\n", client->argc);
 338
 339         pdu = malloc(sizeof(*pdu));
 340         for (i = 0; i < client->argc; i++)
 341                 strcpy((char *) pdu->argv[i], client->argv[i]);
 342
 343         pdu->argc = cpu_to_le16(client->argc);
 344         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOBLINE, pdu, sizeof(*pdu));
 345         free(pdu);
 346         return ret;
 347 }
 348
 349 int fio_clients_connect(void)
 350 {
 351         struct fio_client *client;
 352         struct flist_head *entry, *tmp;
 353         int ret;
 354
 355         dprint(FD_NET, "client: connect all\n");
 356
 357         client_signal_handler();
 358
 359         flist_for_each_safe(entry, tmp, &client_list) {
 360                 client = flist_entry(entry, struct fio_client, list);
 361
 362                 ret = fio_client_connect(client);
 363                 if (ret) {
 364                         remove_client(client);
 365                         continue;
 366                 }
 367
 368                 probe_client(client);
 369
 370                 if (client->argc > 1)
 371                         send_client_cmd_line(client);
 372         }
 373
 374         return !nr_clients;
 375 }
 376
 377 /*
 378  * Send file contents to server backend. We could use sendfile(), but to remain
 379  * more portable lets just read/write the darn thing.
 380  */
 381 static int fio_client_send_ini(struct fio_client *client, const char *filename)
 382 {
 383         struct stat sb;
 384         char *p, *buf;
 385         off_t len;
 386         int fd, ret;
 387
 388         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 389
 390         fd = open(filename, O_RDONLY);
 391         if (fd < 0) {
 392                 log_err("fio: job file <%s> open: %s\n", filename, strerror(errno));
 393                 return 1;
 394         }
 395
 396         if (fstat(fd, &sb) < 0) {
 397                 log_err("fio: job file stat: %s\n", strerror(errno));
 398                 return 1;
 399         }
 400
 401         buf = malloc(sb.st_size);
 402
 403         len = sb.st_size;
 404         p = buf;
 405         do {
 406                 ret = read(fd, p, len);
 407                 if (ret > 0) {
 408                         len -= ret;
 409                         if (!len)
 410                                 break;
 411                         p += ret;
 412                         continue;
 413                 } else if (!ret)
 414                         break;
 415                 else if (errno == EAGAIN || errno == EINTR)
 416                         continue;
 417         } while (1);
 418
 419         if (len) {
 420                 log_err("fio: failed reading job file %s\n", filename);
 421                 return 1;
 422         }
 423
 424         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, buf, sb.st_size);
 425         free(buf);
 426         return ret;
 427 }
 428
 429 int fio_clients_send_ini(const char *filename)
 430 {
 431         struct fio_client *client;
 432         struct flist_head *entry, *tmp;
 433
 434         flist_for_each_safe(entry, tmp, &client_list) {
 435                 client = flist_entry(entry, struct fio_client, list);
 436
 437                 if (fio_client_send_ini(client, filename))
 438                         remove_client(client);
 439         }
 440
 441         return !nr_clients;
 442 }
 443
 444 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
 445 {
 446         dst->max_val    = le64_to_cpu(src->max_val);
 447         dst->min_val    = le64_to_cpu(src->min_val);
 448         dst->samples    = le64_to_cpu(src->samples);
 449
 450         /*
 451          * Floats arrive as IEEE 754 encoded uint64_t, convert back to double
 452          */
 453         dst->mean.u.f   = fio_uint64_to_double(le64_to_cpu(dst->mean.u.i));
 454         dst->S.u.f      = fio_uint64_to_double(le64_to_cpu(dst->S.u.i));
 455 }
 456
 457 static void convert_ts(struct thread_stat *dst, struct thread_stat *src)
 458 {
 459         int i, j;
 460
 461         dst->error      = le32_to_cpu(src->error);
 462         dst->groupid    = le32_to_cpu(src->groupid);
 463         dst->pid        = le32_to_cpu(src->pid);
 464         dst->members    = le32_to_cpu(src->members);
 465
 466         for (i = 0; i < 2; i++) {
 467                 convert_io_stat(&dst->clat_stat[i], &src->clat_stat[i]);
 468                 convert_io_stat(&dst->slat_stat[i], &src->slat_stat[i]);
 469                 convert_io_stat(&dst->lat_stat[i], &src->lat_stat[i]);
 470                 convert_io_stat(&dst->bw_stat[i], &src->bw_stat[i]);
 471         }
 472
 473         dst->usr_time           = le64_to_cpu(src->usr_time);
 474         dst->sys_time           = le64_to_cpu(src->sys_time);
 475         dst->ctx                = le64_to_cpu(src->ctx);
 476         dst->minf               = le64_to_cpu(src->minf);
 477         dst->majf               = le64_to_cpu(src->majf);
 478         dst->clat_percentiles   = le64_to_cpu(src->clat_percentiles);
 479
 480         for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
 481                 fio_fp64_t *fps = &src->percentile_list[i];
 482                 fio_fp64_t *fpd = &dst->percentile_list[i];
 483
 484                 fpd->u.f = fio_uint64_to_double(le64_to_cpu(fps->u.i));
 485         }
 486
 487         for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 488                 dst->io_u_map[i]        = le32_to_cpu(src->io_u_map[i]);
 489                 dst->io_u_submit[i]     = le32_to_cpu(src->io_u_submit[i]);
 490                 dst->io_u_complete[i]   = le32_to_cpu(src->io_u_complete[i]);
 491         }
 492
 493         for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
 494                 dst->io_u_lat_u[i]      = le32_to_cpu(src->io_u_lat_u[i]);
 495                 dst->io_u_lat_m[i]      = le32_to_cpu(src->io_u_lat_m[i]);
 496         }
 497
 498         for (i = 0; i < 2; i++)
 499                 for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
 500                         dst->io_u_plat[i][j] = le32_to_cpu(src->io_u_plat[i][j]);
 501
 502         for (i = 0; i < 3; i++) {
 503                 dst->total_io_u[i]      = le64_to_cpu(src->total_io_u[i]);
 504                 dst->short_io_u[i]      = le64_to_cpu(src->short_io_u[i]);
 505         }
 506
 507         dst->total_submit       = le64_to_cpu(src->total_submit);
 508         dst->total_complete     = le64_to_cpu(src->total_complete);
 509
 510         for (i = 0; i < 2; i++) {
 511                 dst->io_bytes[i]        = le64_to_cpu(src->io_bytes[i]);
 512                 dst->runtime[i]         = le64_to_cpu(src->runtime[i]);
 513         }
 514
 515         dst->total_run_time     = le64_to_cpu(src->total_run_time);
 516         dst->continue_on_error  = le16_to_cpu(src->continue_on_error);
 517         dst->total_err_count    = le64_to_cpu(src->total_err_count);
 518         dst->first_error        = le32_to_cpu(src->first_error);
 519         dst->kb_base            = le32_to_cpu(src->kb_base);
 520 }
 521
 522 static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
 523 {
 524         int i;
 525
 526         for (i = 0; i < 2; i++) {
 527                 dst->max_run[i]         = le64_to_cpu(src->max_run[i]);
 528                 dst->min_run[i]         = le64_to_cpu(src->min_run[i]);
 529                 dst->max_bw[i]          = le64_to_cpu(src->max_bw[i]);
 530                 dst->min_bw[i]          = le64_to_cpu(src->min_bw[i]);
 531                 dst->io_kb[i]           = le64_to_cpu(src->io_kb[i]);
 532                 dst->agg[i]             = le64_to_cpu(src->agg[i]);
 533         }
 534
 535         dst->kb_base    = le32_to_cpu(src->kb_base);
 536         dst->groupid    = le32_to_cpu(src->groupid);
 537 }
 538
 539 static void handle_ts(struct fio_net_cmd *cmd)
 540 {
 541         struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
 542
 543         convert_ts(&p->ts, &p->ts);
 544         convert_gs(&p->rs, &p->rs);
 545
 546         show_thread_status(&p->ts, &p->rs);
 547 }
 548
 549 static void handle_gs(struct fio_net_cmd *cmd)
 550 {
 551         struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
 552
 553         convert_gs(gs, gs);
 554         show_group_stats(gs);
 555 }
 556
 557 static void handle_eta(struct fio_net_cmd *cmd)
 558 {
 559         struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
 560         int i;
 561
 562         je->nr_running          = le32_to_cpu(je->nr_running);
 563         je->nr_ramp             = le32_to_cpu(je->nr_ramp);
 564         je->nr_pending          = le32_to_cpu(je->nr_pending);
 565         je->files_open          = le32_to_cpu(je->files_open);
 566         je->m_rate              = le32_to_cpu(je->m_rate);
 567         je->t_rate              = le32_to_cpu(je->t_rate);
 568         je->m_iops              = le32_to_cpu(je->m_iops);
 569         je->t_iops              = le32_to_cpu(je->t_iops);
 570
 571         for (i = 0; i < 2; i++) {
 572                 je->rate[i]     = le32_to_cpu(je->rate[i]);
 573                 je->iops[i]     = le32_to_cpu(je->iops[i]);
 574         }
 575
 576         je->elapsed_sec         = le32_to_cpu(je->nr_running);
 577         je->eta_sec             = le64_to_cpu(je->eta_sec);
 578
 579         display_thread_status(je);
 580 }
 581
 582 static void handle_probe(struct fio_net_cmd *cmd)
 583 {
 584         struct cmd_probe_pdu *probe = (struct cmd_probe_pdu *) cmd->payload;
 585
 586         log_info("Probe: hostname=%s, be=%u, fio ver %u.%u.%u\n",
 587                 probe->hostname, probe->bigendian, probe->fio_major,
 588                 probe->fio_minor, probe->fio_patch);
 589 }
 590
 591 static int handle_client(struct fio_client *client)
 592 {
 593         struct fio_net_cmd *cmd;
 594
 595         dprint(FD_NET, "client: handle %s\n", client->hostname);
 596
 597         cmd = fio_net_recv_cmd(client->fd);
 598         if (!cmd)
 599                 return 0;
 600
 601         dprint(FD_NET, "client: got cmd op %d from %s\n",
 602                                         cmd->opcode, client->hostname);
 603
 604         switch (cmd->opcode) {
 605         case FIO_NET_CMD_QUIT:
 606                 remove_client(client);
 607                 free(cmd);
 608                 break;
 609         case FIO_NET_CMD_TEXT: {
 610                 const char *buf = (const char *) cmd->payload;
 611                 int fio_unused ret;
 612
 613                 if (!client->skip_newline)
 614                         fprintf(f_out, "<%s> ", client->hostname);
 615                 ret = fwrite(buf, cmd->pdu_len, 1, f_out);
 616                 fflush(f_out);
 617                 client->skip_newline = strchr(buf, '\n') == NULL;
 618                 free(cmd);
 619                 break;
 620                 }
 621         case FIO_NET_CMD_TS:
 622                 handle_ts(cmd);
 623                 free(cmd);
 624                 break;
 625         case FIO_NET_CMD_GS:
 626                 handle_gs(cmd);
 627                 free(cmd);
 628                 break;
 629         case FIO_NET_CMD_ETA:
 630                 handle_eta(cmd);
 631                 free(cmd);
 632                 break;
 633         case FIO_NET_CMD_PROBE:
 634                 handle_probe(cmd);
 635                 free(cmd);
 636                 break;
 637         case FIO_NET_CMD_START:
 638                 client->state = Client_started;
 639                 free(cmd);
 640                 break;
 641         case FIO_NET_CMD_STOP:
 642                 client->state = Client_stopped;
 643                 free(cmd);
 644                 break;
 645         default:
 646                 log_err("fio: unknown client op: %d\n", cmd->opcode);
 647                 free(cmd);
 648                 break;
 649         }
 650
 651         return 1;
 652 }
 653
 654 int fio_handle_clients(void)
 655 {
 656         struct fio_client *client;
 657         struct flist_head *entry;
 658         struct pollfd *pfds;
 659         int i, ret = 0;
 660
 661         pfds = malloc(nr_clients * sizeof(struct pollfd));
 662
 663         while (!exit_backend && nr_clients) {
 664                 i = 0;
 665                 flist_for_each(entry, &client_list) {
 666                         client = flist_entry(entry, struct fio_client, list);
 667
 668                         pfds[i].fd = client->fd;
 669                         pfds[i].events = POLLIN;
 670                         i++;
 671                 }
 672
 673                 assert(i == nr_clients);
 674
 675                 do {
 676                         ret = poll(pfds, nr_clients, 100);
 677                         if (ret < 0) {
 678                                 if (errno == EINTR)
 679                                         continue;
 680                                 log_err("fio: poll clients: %s\n", strerror(errno));
 681                                 break;
 682                         } else if (!ret)
 683                                 continue;
 684                 } while (ret <= 0);
 685
 686                 for (i = 0; i < nr_clients; i++) {
 687                         if (!(pfds[i].revents & POLLIN))
 688                                 continue;
 689
 690                         client = find_client_by_fd(pfds[i].fd);
 691                         if (!client) {
 692                                 log_err("fio: unknown client fd %d\n", pfds[i].fd);
 693                                 continue;
 694                         }
 695                         if (!handle_client(client)) {
 696                                 log_info("client: host=%s disconnected\n",
 697                                                 client->hostname);
 698                                 remove_client(client);
 699                         }
 700                 }
 701         }
 702
 703         free(pfds);
 704         return 0;
 705 }