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 hash_list;
  26         struct sockaddr_in addr;
  27         struct sockaddr_un addr_un;
  28         char *hostname;
  29         int port;
  30         int fd;
  31
  32         char *name;
  33
  34         int state;
  35         int skip_newline;
  36         int is_sock;
  37
  38         uint16_t argc;
  39         char **argv;
  40 };
  41
  42 static struct jobs_eta client_etas;
  43 static int received_etas;
  44
  45 enum {
  46         Client_created          = 0,
  47         Client_connected        = 1,
  48         Client_started          = 2,
  49         Client_stopped          = 3,
  50         Client_exited           = 4,
  51 };
  52
  53 static FLIST_HEAD(client_list);
  54
  55 #define FIO_CLIENT_HASH_BITS    7
  56 #define FIO_CLIENT_HASH_SZ      (1 << FIO_CLIENT_HASH_BITS)
  57 #define FIO_CLIENT_HASH_MASK    (FIO_CLIENT_HASH_SZ - 1)
  58 static struct flist_head client_hash[FIO_CLIENT_HASH_SZ];
  59
  60 static int handle_client(struct fio_client *client);
  61
  62 static void fio_client_add_hash(struct fio_client *client)
  63 {
  64         int bucket = hash_long(client->fd, FIO_CLIENT_HASH_BITS);
  65
  66         bucket &= FIO_CLIENT_HASH_MASK;
  67         flist_add(&client->hash_list, &client_hash[bucket]);
  68 }
  69
  70 static void fio_client_remove_hash(struct fio_client *client)
  71 {
  72         if (!flist_empty(&client->hash_list))
  73                 flist_del_init(&client->hash_list);
  74 }
  75
  76 static void fio_init fio_client_hash_init(void)
  77 {
  78         int i;
  79
  80         for (i = 0; i < FIO_CLIENT_HASH_SZ; i++)
  81                 INIT_FLIST_HEAD(&client_hash[i]);
  82 }
  83
  84 static struct fio_client *find_client_by_fd(int fd)
  85 {
  86         int bucket = hash_long(fd, FIO_CLIENT_HASH_BITS) & FIO_CLIENT_HASH_MASK;
  87         struct fio_client *client;
  88         struct flist_head *entry;
  89
  90         flist_for_each(entry, &client_hash[bucket]) {
  91                 client = flist_entry(entry, struct fio_client, hash_list);
  92
  93                 if (client->fd == fd)
  94                         return client;
  95         }
  96
  97         return NULL;
  98 }
  99
 100 static void remove_client(struct fio_client *client)
 101 {
 102         dprint(FD_NET, "client: removed <%s>\n", client->hostname);
 103         flist_del(&client->list);
 104
 105         fio_client_remove_hash(client);
 106
 107         free(client->hostname);
 108         if (client->argv)
 109                 free(client->argv);
 110         if (client->name)
 111                 free(client->name);
 112
 113         free(client);
 114         nr_clients--;
 115 }
 116
 117 static void __fio_client_add_cmd_option(struct fio_client *client,
 118                                         const char *opt)
 119 {
 120         int index;
 121
 122         index = client->argc++;
 123         client->argv = realloc(client->argv, sizeof(char *) * client->argc);
 124         client->argv[index] = strdup(opt);
 125         dprint(FD_NET, "client: add cmd %d: %s\n", index, opt);
 126 }
 127
 128 void fio_client_add_cmd_option(void *cookie, const char *opt)
 129 {
 130         struct fio_client *client = cookie;
 131
 132         if (!client || !opt)
 133                 return;
 134
 135         __fio_client_add_cmd_option(client, opt);
 136 }
 137
 138 int fio_client_add(const char *hostname, void **cookie)
 139 {
 140         struct fio_client *client;
 141
 142         client = malloc(sizeof(*client));
 143         memset(client, 0, sizeof(*client));
 144
 145         INIT_FLIST_HEAD(&client->list);
 146         INIT_FLIST_HEAD(&client->hash_list);
 147
 148         if (fio_server_parse_string(hostname, &client->hostname,
 149                                         &client->is_sock, &client->port,
 150                                         &client->addr.sin_addr))
 151                 return -1;
 152
 153         client->fd = -1;
 154
 155         __fio_client_add_cmd_option(client, "fio");
 156
 157         flist_add(&client->list, &client_list);
 158         nr_clients++;
 159         dprint(FD_NET, "client: added <%s>\n", client->hostname);
 160         *cookie = client;
 161         return 0;
 162 }
 163
 164 static int fio_client_connect_ip(struct fio_client *client)
 165 {
 166         int fd;
 167
 168         client->addr.sin_family = AF_INET;
 169         client->addr.sin_port = htons(client->port);
 170
 171         fd = socket(AF_INET, SOCK_STREAM, 0);
 172         if (fd < 0) {
 173                 log_err("fio: socket: %s\n", strerror(errno));
 174                 return -1;
 175         }
 176
 177         if (connect(fd, (struct sockaddr *) &client->addr, sizeof(client->addr)) < 0) {
 178                 log_err("fio: connect: %s\n", strerror(errno));
 179                 log_err("fio: failed to connect to %s:%u\n", client->hostname,
 180                                                                 client->port);
 181                 close(fd);
 182                 return -1;
 183         }
 184
 185         return fd;
 186 }
 187
 188 static int fio_client_connect_sock(struct fio_client *client)
 189 {
 190         struct sockaddr_un *addr = &client->addr_un;
 191         fio_socklen_t len;
 192         int fd;
 193
 194         memset(addr, 0, sizeof(*addr));
 195         addr->sun_family = AF_UNIX;
 196         strcpy(addr->sun_path, client->hostname);
 197
 198         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 199         if (fd < 0) {
 200                 log_err("fio: socket: %s\n", strerror(errno));
 201                 return -1;
 202         }
 203
 204         len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
 205         if (connect(fd, (struct sockaddr *) addr, len) < 0) {
 206                 log_err("fio: connect; %s\n", strerror(errno));
 207                 close(fd);
 208                 return -1;
 209         }
 210
 211         return fd;
 212 }
 213
 214 static int fio_client_connect(struct fio_client *client)
 215 {
 216         int fd;
 217
 218         dprint(FD_NET, "client: connect to host %s\n", client->hostname);
 219
 220         if (client->is_sock)
 221                 fd = fio_client_connect_sock(client);
 222         else
 223                 fd = fio_client_connect_ip(client);
 224
 225         if (fd < 0)
 226                 return 1;
 227
 228         client->fd = fd;
 229         fio_client_add_hash(client);
 230         client->state = Client_connected;
 231         return 0;
 232 }
 233
 234 void fio_clients_terminate(void)
 235 {
 236         struct flist_head *entry;
 237         struct fio_client *client;
 238
 239         dprint(FD_NET, "client: terminate clients\n");
 240
 241         flist_for_each(entry, &client_list) {
 242                 client = flist_entry(entry, struct fio_client, list);
 243
 244                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_QUIT, 0);
 245         }
 246 }
 247
 248 static void sig_int(int sig)
 249 {
 250         dprint(FD_NET, "client: got signal %d\n", sig);
 251         fio_clients_terminate();
 252 }
 253
 254 static void client_signal_handler(void)
 255 {
 256         struct sigaction act;
 257
 258         memset(&act, 0, sizeof(act));
 259         act.sa_handler = sig_int;
 260         act.sa_flags = SA_RESTART;
 261         sigaction(SIGINT, &act, NULL);
 262
 263         memset(&act, 0, sizeof(act));
 264         act.sa_handler = sig_int;
 265         act.sa_flags = SA_RESTART;
 266         sigaction(SIGTERM, &act, NULL);
 267 }
 268
 269 static void probe_client(struct fio_client *client)
 270 {
 271         dprint(FD_NET, "client: send probe\n");
 272
 273         fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_PROBE, 0);
 274         handle_client(client);
 275 }
 276
 277 static int send_client_cmd_line(struct fio_client *client)
 278 {
 279         struct cmd_single_line_pdu *cslp;
 280         struct cmd_line_pdu *clp;
 281         unsigned long offset;
 282         void *pdu;
 283         size_t mem;
 284         int i, ret;
 285
 286         dprint(FD_NET, "client: send cmdline %d\n", client->argc);
 287
 288         /*
 289          * Find out how much mem we need
 290          */
 291         for (i = 0, mem = 0; i < client->argc; i++)
 292                 mem += strlen(client->argv[i]) + 1;
 293
 294         /*
 295          * We need one cmd_line_pdu, and argc number of cmd_single_line_pdu
 296          */
 297         mem += sizeof(*clp) + (client->argc * sizeof(*cslp));
 298
 299         pdu = malloc(mem);
 300         clp = pdu;
 301         offset = sizeof(*clp);
 302
 303         for (i = 0; i < client->argc; i++) {
 304                 uint16_t arg_len = strlen(client->argv[i]) + 1;
 305
 306                 cslp = pdu + offset;
 307                 strcpy((char *) cslp->text, client->argv[i]);
 308                 cslp->len = cpu_to_le16(arg_len);
 309                 offset += sizeof(*cslp) + arg_len;
 310         }
 311
 312         clp->lines = cpu_to_le16(client->argc);
 313         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOBLINE, pdu, mem);
 314         free(pdu);
 315         return ret;
 316 }
 317
 318 int fio_clients_connect(void)
 319 {
 320         struct fio_client *client;
 321         struct flist_head *entry, *tmp;
 322         int ret;
 323
 324         dprint(FD_NET, "client: connect all\n");
 325
 326         client_signal_handler();
 327
 328         flist_for_each_safe(entry, tmp, &client_list) {
 329                 client = flist_entry(entry, struct fio_client, list);
 330
 331                 ret = fio_client_connect(client);
 332                 if (ret) {
 333                         remove_client(client);
 334                         continue;
 335                 }
 336
 337                 probe_client(client);
 338
 339                 if (client->argc > 1)
 340                         send_client_cmd_line(client);
 341         }
 342
 343         return !nr_clients;
 344 }
 345
 346 /*
 347  * Send file contents to server backend. We could use sendfile(), but to remain
 348  * more portable lets just read/write the darn thing.
 349  */
 350 static int fio_client_send_ini(struct fio_client *client, const char *filename)
 351 {
 352         struct stat sb;
 353         char *p, *buf;
 354         off_t len;
 355         int fd, ret;
 356
 357         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 358
 359         fd = open(filename, O_RDONLY);
 360         if (fd < 0) {
 361                 log_err("fio: job file <%s> open: %s\n", filename, strerror(errno));
 362                 return 1;
 363         }
 364
 365         if (fstat(fd, &sb) < 0) {
 366                 log_err("fio: job file stat: %s\n", strerror(errno));
 367                 close(fd);
 368                 return 1;
 369         }
 370
 371         buf = malloc(sb.st_size);
 372
 373         len = sb.st_size;
 374         p = buf;
 375         do {
 376                 ret = read(fd, p, len);
 377                 if (ret > 0) {
 378                         len -= ret;
 379                         if (!len)
 380                                 break;
 381                         p += ret;
 382                         continue;
 383                 } else if (!ret)
 384                         break;
 385                 else if (errno == EAGAIN || errno == EINTR)
 386                         continue;
 387         } while (1);
 388
 389         if (len) {
 390                 log_err("fio: failed reading job file %s\n", filename);
 391                 close(fd);
 392                 free(buf);
 393                 return 1;
 394         }
 395
 396         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, buf, sb.st_size);
 397         free(buf);
 398         close(fd);
 399         return ret;
 400 }
 401
 402 int fio_clients_send_ini(const char *filename)
 403 {
 404         struct fio_client *client;
 405         struct flist_head *entry, *tmp;
 406
 407         flist_for_each_safe(entry, tmp, &client_list) {
 408                 client = flist_entry(entry, struct fio_client, list);
 409
 410                 if (fio_client_send_ini(client, filename))
 411                         remove_client(client);
 412         }
 413
 414         return !nr_clients;
 415 }
 416
 417 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
 418 {
 419         dst->max_val    = le64_to_cpu(src->max_val);
 420         dst->min_val    = le64_to_cpu(src->min_val);
 421         dst->samples    = le64_to_cpu(src->samples);
 422
 423         /*
 424          * Floats arrive as IEEE 754 encoded uint64_t, convert back to double
 425          */
 426         dst->mean.u.f   = fio_uint64_to_double(le64_to_cpu(dst->mean.u.i));
 427         dst->S.u.f      = fio_uint64_to_double(le64_to_cpu(dst->S.u.i));
 428 }
 429
 430 static void convert_ts(struct thread_stat *dst, struct thread_stat *src)
 431 {
 432         int i, j;
 433
 434         dst->error      = le32_to_cpu(src->error);
 435         dst->groupid    = le32_to_cpu(src->groupid);
 436         dst->pid        = le32_to_cpu(src->pid);
 437         dst->members    = le32_to_cpu(src->members);
 438
 439         for (i = 0; i < 2; i++) {
 440                 convert_io_stat(&dst->clat_stat[i], &src->clat_stat[i]);
 441                 convert_io_stat(&dst->slat_stat[i], &src->slat_stat[i]);
 442                 convert_io_stat(&dst->lat_stat[i], &src->lat_stat[i]);
 443                 convert_io_stat(&dst->bw_stat[i], &src->bw_stat[i]);
 444         }
 445
 446         dst->usr_time           = le64_to_cpu(src->usr_time);
 447         dst->sys_time           = le64_to_cpu(src->sys_time);
 448         dst->ctx                = le64_to_cpu(src->ctx);
 449         dst->minf               = le64_to_cpu(src->minf);
 450         dst->majf               = le64_to_cpu(src->majf);
 451         dst->clat_percentiles   = le64_to_cpu(src->clat_percentiles);
 452
 453         for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
 454                 fio_fp64_t *fps = &src->percentile_list[i];
 455                 fio_fp64_t *fpd = &dst->percentile_list[i];
 456
 457                 fpd->u.f = fio_uint64_to_double(le64_to_cpu(fps->u.i));
 458         }
 459
 460         for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 461                 dst->io_u_map[i]        = le32_to_cpu(src->io_u_map[i]);
 462                 dst->io_u_submit[i]     = le32_to_cpu(src->io_u_submit[i]);
 463                 dst->io_u_complete[i]   = le32_to_cpu(src->io_u_complete[i]);
 464         }
 465
 466         for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
 467                 dst->io_u_lat_u[i]      = le32_to_cpu(src->io_u_lat_u[i]);
 468                 dst->io_u_lat_m[i]      = le32_to_cpu(src->io_u_lat_m[i]);
 469         }
 470
 471         for (i = 0; i < 2; i++)
 472                 for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
 473                         dst->io_u_plat[i][j] = le32_to_cpu(src->io_u_plat[i][j]);
 474
 475         for (i = 0; i < 3; i++) {
 476                 dst->total_io_u[i]      = le64_to_cpu(src->total_io_u[i]);
 477                 dst->short_io_u[i]      = le64_to_cpu(src->short_io_u[i]);
 478         }
 479
 480         dst->total_submit       = le64_to_cpu(src->total_submit);
 481         dst->total_complete     = le64_to_cpu(src->total_complete);
 482
 483         for (i = 0; i < 2; i++) {
 484                 dst->io_bytes[i]        = le64_to_cpu(src->io_bytes[i]);
 485                 dst->runtime[i]         = le64_to_cpu(src->runtime[i]);
 486         }
 487
 488         dst->total_run_time     = le64_to_cpu(src->total_run_time);
 489         dst->continue_on_error  = le16_to_cpu(src->continue_on_error);
 490         dst->total_err_count    = le64_to_cpu(src->total_err_count);
 491         dst->first_error        = le32_to_cpu(src->first_error);
 492         dst->kb_base            = le32_to_cpu(src->kb_base);
 493 }
 494
 495 static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
 496 {
 497         int i;
 498
 499         for (i = 0; i < 2; i++) {
 500                 dst->max_run[i]         = le64_to_cpu(src->max_run[i]);
 501                 dst->min_run[i]         = le64_to_cpu(src->min_run[i]);
 502                 dst->max_bw[i]          = le64_to_cpu(src->max_bw[i]);
 503                 dst->min_bw[i]          = le64_to_cpu(src->min_bw[i]);
 504                 dst->io_kb[i]           = le64_to_cpu(src->io_kb[i]);
 505                 dst->agg[i]             = le64_to_cpu(src->agg[i]);
 506         }
 507
 508         dst->kb_base    = le32_to_cpu(src->kb_base);
 509         dst->groupid    = le32_to_cpu(src->groupid);
 510 }
 511
 512 static void handle_ts(struct fio_net_cmd *cmd)
 513 {
 514         struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
 515
 516         convert_ts(&p->ts, &p->ts);
 517         convert_gs(&p->rs, &p->rs);
 518
 519         show_thread_status(&p->ts, &p->rs);
 520 }
 521
 522 static void handle_gs(struct fio_net_cmd *cmd)
 523 {
 524         struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
 525
 526         convert_gs(gs, gs);
 527         show_group_stats(gs);
 528 }
 529
 530 static void convert_jobs_eta(struct jobs_eta *je)
 531 {
 532         int i;
 533
 534         je->nr_running          = le32_to_cpu(je->nr_running);
 535         je->nr_ramp             = le32_to_cpu(je->nr_ramp);
 536         je->nr_pending          = le32_to_cpu(je->nr_pending);
 537         je->files_open          = le32_to_cpu(je->files_open);
 538         je->m_rate              = le32_to_cpu(je->m_rate);
 539         je->t_rate              = le32_to_cpu(je->t_rate);
 540         je->m_iops              = le32_to_cpu(je->m_iops);
 541         je->t_iops              = le32_to_cpu(je->t_iops);
 542
 543         for (i = 0; i < 2; i++) {
 544                 je->rate[i]     = le32_to_cpu(je->rate[i]);
 545                 je->iops[i]     = le32_to_cpu(je->iops[i]);
 546         }
 547
 548         je->elapsed_sec         = le64_to_cpu(je->elapsed_sec);
 549         je->eta_sec             = le64_to_cpu(je->eta_sec);
 550 }
 551
 552 static void sum_jobs_eta(struct jobs_eta *je)
 553 {
 554         struct jobs_eta *dst = &client_etas;
 555         int i;
 556
 557         dst->nr_running         += je->nr_running;
 558         dst->nr_ramp            += je->nr_ramp;
 559         dst->nr_pending         += je->nr_pending;
 560         dst->files_open         += je->files_open;
 561         dst->m_rate             += je->m_rate;
 562         dst->t_rate             += je->t_rate;
 563         dst->m_iops             += je->m_iops;
 564         dst->t_iops             += je->t_iops;
 565
 566         for (i = 0; i < 2; i++) {
 567                 dst->rate[i]    += je->rate[i];
 568                 dst->iops[i]    += je->iops[i];
 569         }
 570
 571         dst->elapsed_sec        += je->elapsed_sec;
 572
 573         if (je->eta_sec > dst->eta_sec)
 574                 dst->eta_sec = je->eta_sec;
 575 }
 576
 577 static void handle_eta(struct fio_net_cmd *cmd)
 578 {
 579         struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
 580
 581         convert_jobs_eta(je);
 582
 583         if (nr_clients > 1) {
 584                 sum_jobs_eta(je);
 585                 received_etas++;
 586                 if (received_etas == nr_clients) {
 587                         received_etas = 0;
 588                         display_thread_status(&client_etas);
 589                         memset(&client_etas, 0, sizeof(client_etas));
 590                 }
 591         } else
 592                 display_thread_status(je);
 593 }
 594
 595 static void handle_probe(struct fio_client *client, struct fio_net_cmd *cmd)
 596 {
 597         struct cmd_probe_pdu *probe = (struct cmd_probe_pdu *) cmd->payload;
 598         const char *os, *arch;
 599
 600         os = fio_get_os_string(probe->os);
 601         if (!os)
 602                 os = "unknown";
 603
 604         arch = fio_get_arch_string(probe->arch);
 605         if (!arch)
 606                 os = "unknown";
 607
 608         log_info("hostname=%s, be=%u, os=%s, arch=%s, fio=%u.%u.%u\n",
 609                 probe->hostname, probe->bigendian, os, arch, probe->fio_major,
 610                 probe->fio_minor, probe->fio_patch);
 611
 612         if (!client->name)
 613                 client->name = strdup((char *) probe->hostname);
 614 }
 615
 616 static int handle_client(struct fio_client *client)
 617 {
 618         struct fio_net_cmd *cmd;
 619
 620         dprint(FD_NET, "client: handle %s\n", client->hostname);
 621
 622         cmd = fio_net_recv_cmd(client->fd);
 623         if (!cmd)
 624                 return 0;
 625
 626         dprint(FD_NET, "client: got cmd op %d from %s\n",
 627                                         cmd->opcode, client->hostname);
 628
 629         switch (cmd->opcode) {
 630         case FIO_NET_CMD_QUIT:
 631                 remove_client(client);
 632                 free(cmd);
 633                 break;
 634         case FIO_NET_CMD_TEXT: {
 635                 const char *buf = (const char *) cmd->payload;
 636                 const char *name;
 637                 int fio_unused ret;
 638
 639                 name = client->name ? client->name : client->hostname;
 640
 641                 if (!client->skip_newline)
 642                         fprintf(f_out, "<%s> ", name);
 643                 ret = fwrite(buf, cmd->pdu_len, 1, f_out);
 644                 fflush(f_out);
 645                 client->skip_newline = strchr(buf, '\n') == NULL;
 646                 free(cmd);
 647                 break;
 648                 }
 649         case FIO_NET_CMD_TS:
 650                 handle_ts(cmd);
 651                 free(cmd);
 652                 break;
 653         case FIO_NET_CMD_GS:
 654                 handle_gs(cmd);
 655                 free(cmd);
 656                 break;
 657         case FIO_NET_CMD_ETA:
 658                 handle_eta(cmd);
 659                 free(cmd);
 660                 break;
 661         case FIO_NET_CMD_PROBE:
 662                 handle_probe(client, cmd);
 663                 free(cmd);
 664                 break;
 665         case FIO_NET_CMD_START:
 666                 client->state = Client_started;
 667                 free(cmd);
 668                 break;
 669         case FIO_NET_CMD_STOP:
 670                 client->state = Client_stopped;
 671                 free(cmd);
 672                 break;
 673         default:
 674                 log_err("fio: unknown client op: %d\n", cmd->opcode);
 675                 free(cmd);
 676                 break;
 677         }
 678
 679         return 1;
 680 }
 681
 682 int fio_handle_clients(void)
 683 {
 684         struct fio_client *client;
 685         struct flist_head *entry;
 686         struct pollfd *pfds;
 687         int i, ret = 0;
 688
 689         pfds = malloc(nr_clients * sizeof(struct pollfd));
 690
 691         while (!exit_backend && nr_clients) {
 692                 i = 0;
 693                 flist_for_each(entry, &client_list) {
 694                         client = flist_entry(entry, struct fio_client, list);
 695
 696                         pfds[i].fd = client->fd;
 697                         pfds[i].events = POLLIN;
 698                         i++;
 699                 }
 700
 701                 assert(i == nr_clients);
 702
 703                 do {
 704                         ret = poll(pfds, nr_clients, 100);
 705                         if (ret < 0) {
 706                                 if (errno == EINTR)
 707                                         continue;
 708                                 log_err("fio: poll clients: %s\n", strerror(errno));
 709                                 break;
 710                         } else if (!ret)
 711                                 continue;
 712                 } while (ret <= 0);
 713
 714                 for (i = 0; i < nr_clients; i++) {
 715                         if (!(pfds[i].revents & POLLIN))
 716                                 continue;
 717
 718                         client = find_client_by_fd(pfds[i].fd);
 719                         if (!client) {
 720                                 log_err("fio: unknown client fd %d\n", pfds[i].fd);
 721                                 continue;
 722                         }
 723                         if (!handle_client(client)) {
 724                                 log_info("client: host=%s disconnected\n",
 725                                                 client->hostname);
 726                                 remove_client(client);
 727                         }
 728                 }
 729         }
 730
 731         free(pfds);
 732         return 0;
 733 }