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
  36         int skip_newline;
  37         int is_sock;
  38         int waiting_eta;
  39
  40         uint16_t argc;
  41         char **argv;
  42 };
  43
  44 static struct timeval eta_tv;
  45
  46 enum {
  47         Client_created          = 0,
  48         Client_connected        = 1,
  49         Client_started          = 2,
  50         Client_stopped          = 3,
  51         Client_exited           = 4,
  52 };
  53
  54 struct client_eta {
  55         struct jobs_eta eta;
  56         unsigned int pending;
  57 };
  58
  59 static FLIST_HEAD(client_list);
  60
  61 #define FIO_CLIENT_HASH_BITS    7
  62 #define FIO_CLIENT_HASH_SZ      (1 << FIO_CLIENT_HASH_BITS)
  63 #define FIO_CLIENT_HASH_MASK    (FIO_CLIENT_HASH_SZ - 1)
  64 static struct flist_head client_hash[FIO_CLIENT_HASH_SZ];
  65
  66 static int handle_client(struct fio_client *client);
  67
  68 static void fio_client_add_hash(struct fio_client *client)
  69 {
  70         int bucket = hash_long(client->fd, FIO_CLIENT_HASH_BITS);
  71
  72         bucket &= FIO_CLIENT_HASH_MASK;
  73         flist_add(&client->hash_list, &client_hash[bucket]);
  74 }
  75
  76 static void fio_client_remove_hash(struct fio_client *client)
  77 {
  78         if (!flist_empty(&client->hash_list))
  79                 flist_del_init(&client->hash_list);
  80 }
  81
  82 static void fio_init fio_client_hash_init(void)
  83 {
  84         int i;
  85
  86         for (i = 0; i < FIO_CLIENT_HASH_SZ; i++)
  87                 INIT_FLIST_HEAD(&client_hash[i]);
  88 }
  89
  90 static struct fio_client *find_client_by_fd(int fd)
  91 {
  92         int bucket = hash_long(fd, FIO_CLIENT_HASH_BITS) & FIO_CLIENT_HASH_MASK;
  93         struct fio_client *client;
  94         struct flist_head *entry;
  95
  96         flist_for_each(entry, &client_hash[bucket]) {
  97                 client = flist_entry(entry, struct fio_client, hash_list);
  98
  99                 if (client->fd == fd)
 100                         return client;
 101         }
 102
 103         return NULL;
 104 }
 105
 106 static void remove_client(struct fio_client *client)
 107 {
 108         dprint(FD_NET, "client: removed <%s>\n", client->hostname);
 109         flist_del(&client->list);
 110
 111         fio_client_remove_hash(client);
 112
 113         /* FIXME: check ->waiting_eta and handle it */
 114
 115         free(client->hostname);
 116         if (client->argv)
 117                 free(client->argv);
 118         if (client->name)
 119                 free(client->name);
 120
 121         free(client);
 122         nr_clients--;
 123 }
 124
 125 static void __fio_client_add_cmd_option(struct fio_client *client,
 126                                         const char *opt)
 127 {
 128         int index;
 129
 130         index = client->argc++;
 131         client->argv = realloc(client->argv, sizeof(char *) * client->argc);
 132         client->argv[index] = strdup(opt);
 133         dprint(FD_NET, "client: add cmd %d: %s\n", index, opt);
 134 }
 135
 136 void fio_client_add_cmd_option(void *cookie, const char *opt)
 137 {
 138         struct fio_client *client = cookie;
 139
 140         if (!client || !opt)
 141                 return;
 142
 143         __fio_client_add_cmd_option(client, opt);
 144 }
 145
 146 int fio_client_add(const char *hostname, void **cookie)
 147 {
 148         struct fio_client *client;
 149
 150         client = malloc(sizeof(*client));
 151         memset(client, 0, sizeof(*client));
 152
 153         INIT_FLIST_HEAD(&client->list);
 154         INIT_FLIST_HEAD(&client->hash_list);
 155
 156         if (fio_server_parse_string(hostname, &client->hostname,
 157                                         &client->is_sock, &client->port,
 158                                         &client->addr.sin_addr))
 159                 return -1;
 160
 161         client->fd = -1;
 162
 163         __fio_client_add_cmd_option(client, "fio");
 164
 165         flist_add(&client->list, &client_list);
 166         nr_clients++;
 167         dprint(FD_NET, "client: added <%s>\n", client->hostname);
 168         *cookie = client;
 169         return 0;
 170 }
 171
 172 static int fio_client_connect_ip(struct fio_client *client)
 173 {
 174         int fd;
 175
 176         client->addr.sin_family = AF_INET;
 177         client->addr.sin_port = htons(client->port);
 178
 179         fd = socket(AF_INET, SOCK_STREAM, 0);
 180         if (fd < 0) {
 181                 log_err("fio: socket: %s\n", strerror(errno));
 182                 return -1;
 183         }
 184
 185         if (connect(fd, (struct sockaddr *) &client->addr, sizeof(client->addr)) < 0) {
 186                 log_err("fio: connect: %s\n", strerror(errno));
 187                 log_err("fio: failed to connect to %s:%u\n", client->hostname,
 188                                                                 client->port);
 189                 close(fd);
 190                 return -1;
 191         }
 192
 193         return fd;
 194 }
 195
 196 static int fio_client_connect_sock(struct fio_client *client)
 197 {
 198         struct sockaddr_un *addr = &client->addr_un;
 199         fio_socklen_t len;
 200         int fd;
 201
 202         memset(addr, 0, sizeof(*addr));
 203         addr->sun_family = AF_UNIX;
 204         strcpy(addr->sun_path, client->hostname);
 205
 206         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 207         if (fd < 0) {
 208                 log_err("fio: socket: %s\n", strerror(errno));
 209                 return -1;
 210         }
 211
 212         len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
 213         if (connect(fd, (struct sockaddr *) addr, len) < 0) {
 214                 log_err("fio: connect; %s\n", strerror(errno));
 215                 close(fd);
 216                 return -1;
 217         }
 218
 219         return fd;
 220 }
 221
 222 static int fio_client_connect(struct fio_client *client)
 223 {
 224         int fd;
 225
 226         dprint(FD_NET, "client: connect to host %s\n", client->hostname);
 227
 228         if (client->is_sock)
 229                 fd = fio_client_connect_sock(client);
 230         else
 231                 fd = fio_client_connect_ip(client);
 232
 233         if (fd < 0)
 234                 return 1;
 235
 236         client->fd = fd;
 237         fio_client_add_hash(client);
 238         client->state = Client_connected;
 239         return 0;
 240 }
 241
 242 void fio_clients_terminate(void)
 243 {
 244         struct flist_head *entry;
 245         struct fio_client *client;
 246
 247         dprint(FD_NET, "client: terminate clients\n");
 248
 249         flist_for_each(entry, &client_list) {
 250                 client = flist_entry(entry, struct fio_client, list);
 251
 252                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_QUIT, 0);
 253         }
 254 }
 255
 256 static void sig_int(int sig)
 257 {
 258         dprint(FD_NET, "client: got signal %d\n", sig);
 259         fio_clients_terminate();
 260 }
 261
 262 static void client_signal_handler(void)
 263 {
 264         struct sigaction act;
 265
 266         memset(&act, 0, sizeof(act));
 267         act.sa_handler = sig_int;
 268         act.sa_flags = SA_RESTART;
 269         sigaction(SIGINT, &act, NULL);
 270
 271         memset(&act, 0, sizeof(act));
 272         act.sa_handler = sig_int;
 273         act.sa_flags = SA_RESTART;
 274         sigaction(SIGTERM, &act, NULL);
 275 }
 276
 277 static void probe_client(struct fio_client *client)
 278 {
 279         dprint(FD_NET, "client: send probe\n");
 280
 281         fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_PROBE, 0);
 282         handle_client(client);
 283 }
 284
 285 static int send_client_cmd_line(struct fio_client *client)
 286 {
 287         struct cmd_single_line_pdu *cslp;
 288         struct cmd_line_pdu *clp;
 289         unsigned long offset;
 290         void *pdu;
 291         size_t mem;
 292         int i, ret;
 293
 294         dprint(FD_NET, "client: send cmdline %d\n", client->argc);
 295
 296         /*
 297          * Find out how much mem we need
 298          */
 299         for (i = 0, mem = 0; i < client->argc; i++)
 300                 mem += strlen(client->argv[i]) + 1;
 301
 302         /*
 303          * We need one cmd_line_pdu, and argc number of cmd_single_line_pdu
 304          */
 305         mem += sizeof(*clp) + (client->argc * sizeof(*cslp));
 306
 307         pdu = malloc(mem);
 308         clp = pdu;
 309         offset = sizeof(*clp);
 310
 311         for (i = 0; i < client->argc; i++) {
 312                 uint16_t arg_len = strlen(client->argv[i]) + 1;
 313
 314                 cslp = pdu + offset;
 315                 strcpy((char *) cslp->text, client->argv[i]);
 316                 cslp->len = cpu_to_le16(arg_len);
 317                 offset += sizeof(*cslp) + arg_len;
 318         }
 319
 320         clp->lines = cpu_to_le16(client->argc);
 321         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOBLINE, pdu, mem, 0);
 322         free(pdu);
 323         return ret;
 324 }
 325
 326 int fio_clients_connect(void)
 327 {
 328         struct fio_client *client;
 329         struct flist_head *entry, *tmp;
 330         int ret;
 331
 332         dprint(FD_NET, "client: connect all\n");
 333
 334         client_signal_handler();
 335
 336         flist_for_each_safe(entry, tmp, &client_list) {
 337                 client = flist_entry(entry, struct fio_client, list);
 338
 339                 ret = fio_client_connect(client);
 340                 if (ret) {
 341                         remove_client(client);
 342                         continue;
 343                 }
 344
 345                 probe_client(client);
 346
 347                 if (client->argc > 1)
 348                         send_client_cmd_line(client);
 349         }
 350
 351         return !nr_clients;
 352 }
 353
 354 /*
 355  * Send file contents to server backend. We could use sendfile(), but to remain
 356  * more portable lets just read/write the darn thing.
 357  */
 358 static int fio_client_send_ini(struct fio_client *client, const char *filename)
 359 {
 360         struct stat sb;
 361         char *p, *buf;
 362         off_t len;
 363         int fd, ret;
 364
 365         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 366
 367         fd = open(filename, O_RDONLY);
 368         if (fd < 0) {
 369                 log_err("fio: job file <%s> open: %s\n", filename, strerror(errno));
 370                 return 1;
 371         }
 372
 373         if (fstat(fd, &sb) < 0) {
 374                 log_err("fio: job file stat: %s\n", strerror(errno));
 375                 close(fd);
 376                 return 1;
 377         }
 378
 379         buf = malloc(sb.st_size);
 380
 381         len = sb.st_size;
 382         p = buf;
 383         do {
 384                 ret = read(fd, p, len);
 385                 if (ret > 0) {
 386                         len -= ret;
 387                         if (!len)
 388                                 break;
 389                         p += ret;
 390                         continue;
 391                 } else if (!ret)
 392                         break;
 393                 else if (errno == EAGAIN || errno == EINTR)
 394                         continue;
 395         } while (1);
 396
 397         if (len) {
 398                 log_err("fio: failed reading job file %s\n", filename);
 399                 close(fd);
 400                 free(buf);
 401                 return 1;
 402         }
 403
 404         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, buf, sb.st_size, 0);
 405         free(buf);
 406         close(fd);
 407         return ret;
 408 }
 409
 410 int fio_clients_send_ini(const char *filename)
 411 {
 412         struct fio_client *client;
 413         struct flist_head *entry, *tmp;
 414
 415         flist_for_each_safe(entry, tmp, &client_list) {
 416                 client = flist_entry(entry, struct fio_client, list);
 417
 418                 if (fio_client_send_ini(client, filename))
 419                         remove_client(client);
 420         }
 421
 422         return !nr_clients;
 423 }
 424
 425 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
 426 {
 427         dst->max_val    = le64_to_cpu(src->max_val);
 428         dst->min_val    = le64_to_cpu(src->min_val);
 429         dst->samples    = le64_to_cpu(src->samples);
 430
 431         /*
 432          * Floats arrive as IEEE 754 encoded uint64_t, convert back to double
 433          */
 434         dst->mean.u.f   = fio_uint64_to_double(le64_to_cpu(dst->mean.u.i));
 435         dst->S.u.f      = fio_uint64_to_double(le64_to_cpu(dst->S.u.i));
 436 }
 437
 438 static void convert_ts(struct thread_stat *dst, struct thread_stat *src)
 439 {
 440         int i, j;
 441
 442         dst->error      = le32_to_cpu(src->error);
 443         dst->groupid    = le32_to_cpu(src->groupid);
 444         dst->pid        = le32_to_cpu(src->pid);
 445         dst->members    = le32_to_cpu(src->members);
 446
 447         for (i = 0; i < 2; i++) {
 448                 convert_io_stat(&dst->clat_stat[i], &src->clat_stat[i]);
 449                 convert_io_stat(&dst->slat_stat[i], &src->slat_stat[i]);
 450                 convert_io_stat(&dst->lat_stat[i], &src->lat_stat[i]);
 451                 convert_io_stat(&dst->bw_stat[i], &src->bw_stat[i]);
 452         }
 453
 454         dst->usr_time           = le64_to_cpu(src->usr_time);
 455         dst->sys_time           = le64_to_cpu(src->sys_time);
 456         dst->ctx                = le64_to_cpu(src->ctx);
 457         dst->minf               = le64_to_cpu(src->minf);
 458         dst->majf               = le64_to_cpu(src->majf);
 459         dst->clat_percentiles   = le64_to_cpu(src->clat_percentiles);
 460
 461         for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
 462                 fio_fp64_t *fps = &src->percentile_list[i];
 463                 fio_fp64_t *fpd = &dst->percentile_list[i];
 464
 465                 fpd->u.f = fio_uint64_to_double(le64_to_cpu(fps->u.i));
 466         }
 467
 468         for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 469                 dst->io_u_map[i]        = le32_to_cpu(src->io_u_map[i]);
 470                 dst->io_u_submit[i]     = le32_to_cpu(src->io_u_submit[i]);
 471                 dst->io_u_complete[i]   = le32_to_cpu(src->io_u_complete[i]);
 472         }
 473
 474         for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
 475                 dst->io_u_lat_u[i]      = le32_to_cpu(src->io_u_lat_u[i]);
 476                 dst->io_u_lat_m[i]      = le32_to_cpu(src->io_u_lat_m[i]);
 477         }
 478
 479         for (i = 0; i < 2; i++)
 480                 for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
 481                         dst->io_u_plat[i][j] = le32_to_cpu(src->io_u_plat[i][j]);
 482
 483         for (i = 0; i < 3; i++) {
 484                 dst->total_io_u[i]      = le64_to_cpu(src->total_io_u[i]);
 485                 dst->short_io_u[i]      = le64_to_cpu(src->short_io_u[i]);
 486         }
 487
 488         dst->total_submit       = le64_to_cpu(src->total_submit);
 489         dst->total_complete     = le64_to_cpu(src->total_complete);
 490
 491         for (i = 0; i < 2; i++) {
 492                 dst->io_bytes[i]        = le64_to_cpu(src->io_bytes[i]);
 493                 dst->runtime[i]         = le64_to_cpu(src->runtime[i]);
 494         }
 495
 496         dst->total_run_time     = le64_to_cpu(src->total_run_time);
 497         dst->continue_on_error  = le16_to_cpu(src->continue_on_error);
 498         dst->total_err_count    = le64_to_cpu(src->total_err_count);
 499         dst->first_error        = le32_to_cpu(src->first_error);
 500         dst->kb_base            = le32_to_cpu(src->kb_base);
 501 }
 502
 503 static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
 504 {
 505         int i;
 506
 507         for (i = 0; i < 2; i++) {
 508                 dst->max_run[i]         = le64_to_cpu(src->max_run[i]);
 509                 dst->min_run[i]         = le64_to_cpu(src->min_run[i]);
 510                 dst->max_bw[i]          = le64_to_cpu(src->max_bw[i]);
 511                 dst->min_bw[i]          = le64_to_cpu(src->min_bw[i]);
 512                 dst->io_kb[i]           = le64_to_cpu(src->io_kb[i]);
 513                 dst->agg[i]             = le64_to_cpu(src->agg[i]);
 514         }
 515
 516         dst->kb_base    = le32_to_cpu(src->kb_base);
 517         dst->groupid    = le32_to_cpu(src->groupid);
 518 }
 519
 520 static void handle_ts(struct fio_net_cmd *cmd)
 521 {
 522         struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
 523
 524         convert_ts(&p->ts, &p->ts);
 525         convert_gs(&p->rs, &p->rs);
 526
 527         show_thread_status(&p->ts, &p->rs);
 528 }
 529
 530 static void handle_gs(struct fio_net_cmd *cmd)
 531 {
 532         struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
 533
 534         convert_gs(gs, gs);
 535         show_group_stats(gs);
 536 }
 537
 538 static void convert_jobs_eta(struct jobs_eta *je)
 539 {
 540         int i;
 541
 542         je->nr_running          = le32_to_cpu(je->nr_running);
 543         je->nr_ramp             = le32_to_cpu(je->nr_ramp);
 544         je->nr_pending          = le32_to_cpu(je->nr_pending);
 545         je->files_open          = le32_to_cpu(je->files_open);
 546         je->m_rate              = le32_to_cpu(je->m_rate);
 547         je->t_rate              = le32_to_cpu(je->t_rate);
 548         je->m_iops              = le32_to_cpu(je->m_iops);
 549         je->t_iops              = le32_to_cpu(je->t_iops);
 550
 551         for (i = 0; i < 2; i++) {
 552                 je->rate[i]     = le32_to_cpu(je->rate[i]);
 553                 je->iops[i]     = le32_to_cpu(je->iops[i]);
 554         }
 555
 556         je->elapsed_sec         = le64_to_cpu(je->elapsed_sec);
 557         je->eta_sec             = le64_to_cpu(je->eta_sec);
 558 }
 559
 560 static void sum_jobs_eta(struct jobs_eta *dst, struct jobs_eta *je)
 561 {
 562         int i;
 563
 564         dst->nr_running         += je->nr_running;
 565         dst->nr_ramp            += je->nr_ramp;
 566         dst->nr_pending         += je->nr_pending;
 567         dst->files_open         += je->files_open;
 568         dst->m_rate             += je->m_rate;
 569         dst->t_rate             += je->t_rate;
 570         dst->m_iops             += je->m_iops;
 571         dst->t_iops             += je->t_iops;
 572
 573         for (i = 0; i < 2; i++) {
 574                 dst->rate[i]    += je->rate[i];
 575                 dst->iops[i]    += je->iops[i];
 576         }
 577
 578         dst->elapsed_sec        += je->elapsed_sec;
 579
 580         if (je->eta_sec > dst->eta_sec)
 581                 dst->eta_sec = je->eta_sec;
 582 }
 583
 584 static void handle_eta(struct fio_net_cmd *cmd)
 585 {
 586         struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
 587         struct client_eta *eta = (struct client_eta *) cmd->tag;
 588
 589         dprint(FD_NET, "client: got eta tag %p, %d\n", eta, eta->pending);
 590
 591         convert_jobs_eta(je);
 592         sum_jobs_eta(&eta->eta, je);
 593
 594         if (!--eta->pending) {
 595                 display_thread_status(&eta->eta);
 596                 free(eta);
 597         }
 598 }
 599
 600 static void handle_probe(struct fio_client *client, struct fio_net_cmd *cmd)
 601 {
 602         struct cmd_probe_pdu *probe = (struct cmd_probe_pdu *) cmd->payload;
 603         const char *os, *arch;
 604
 605         os = fio_get_os_string(probe->os);
 606         if (!os)
 607                 os = "unknown";
 608
 609         arch = fio_get_arch_string(probe->arch);
 610         if (!arch)
 611                 os = "unknown";
 612
 613         log_info("hostname=%s, be=%u, os=%s, arch=%s, fio=%u.%u.%u\n",
 614                 probe->hostname, probe->bigendian, os, arch, probe->fio_major,
 615                 probe->fio_minor, probe->fio_patch);
 616
 617         if (!client->name)
 618                 client->name = strdup((char *) probe->hostname);
 619 }
 620
 621 static int handle_client(struct fio_client *client)
 622 {
 623         struct fio_net_cmd *cmd;
 624
 625         dprint(FD_NET, "client: handle %s\n", client->hostname);
 626
 627         cmd = fio_net_recv_cmd(client->fd);
 628         if (!cmd)
 629                 return 0;
 630
 631         dprint(FD_NET, "client: got cmd op %d from %s\n",
 632                                         cmd->opcode, client->hostname);
 633
 634         switch (cmd->opcode) {
 635         case FIO_NET_CMD_QUIT:
 636                 remove_client(client);
 637                 free(cmd);
 638                 break;
 639         case FIO_NET_CMD_TEXT: {
 640                 const char *buf = (const char *) cmd->payload;
 641                 const char *name;
 642                 int fio_unused ret;
 643
 644                 name = client->name ? client->name : client->hostname;
 645
 646                 if (!client->skip_newline)
 647                         fprintf(f_out, "<%s> ", name);
 648                 ret = fwrite(buf, cmd->pdu_len, 1, f_out);
 649                 fflush(f_out);
 650                 client->skip_newline = strchr(buf, '\n') == NULL;
 651                 free(cmd);
 652                 break;
 653                 }
 654         case FIO_NET_CMD_TS:
 655                 handle_ts(cmd);
 656                 free(cmd);
 657                 break;
 658         case FIO_NET_CMD_GS:
 659                 handle_gs(cmd);
 660                 free(cmd);
 661                 break;
 662         case FIO_NET_CMD_ETA:
 663                 handle_eta(cmd);
 664                 free(cmd);
 665                 break;
 666         case FIO_NET_CMD_PROBE:
 667                 handle_probe(client, cmd);
 668                 free(cmd);
 669                 break;
 670         case FIO_NET_CMD_START:
 671                 client->state = Client_started;
 672                 free(cmd);
 673                 break;
 674         case FIO_NET_CMD_STOP:
 675                 client->state = Client_stopped;
 676                 free(cmd);
 677                 break;
 678         default:
 679                 log_err("fio: unknown client op: %d\n", cmd->opcode);
 680                 free(cmd);
 681                 break;
 682         }
 683
 684         return 1;
 685 }
 686
 687 static void request_client_etas(void)
 688 {
 689         struct fio_client *client;
 690         struct flist_head *entry;
 691         struct client_eta *eta;
 692
 693         dprint(FD_NET, "client: request eta (%d)\n", nr_clients);
 694
 695         /*
 696          * We need to do something more clever about checking status
 697          * of command being send, client haven't sent previous ETA
 698          * already, etc.
 699          */
 700
 701         eta = malloc(sizeof(*eta));
 702         memset(&eta->eta, 0, sizeof(eta->eta));
 703         eta->pending = nr_clients;
 704
 705         flist_for_each(entry, &client_list) {
 706                 client = flist_entry(entry, struct fio_client, list);
 707
 708                 client->waiting_eta = 1;
 709                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_SEND_ETA,
 710                                                 (uint64_t) eta);
 711         }
 712
 713         dprint(FD_NET, "client: requested eta tag %p\n", eta);
 714 }
 715
 716 int fio_handle_clients(void)
 717 {
 718         struct fio_client *client;
 719         struct flist_head *entry;
 720         struct pollfd *pfds;
 721         int i, ret = 0;
 722
 723         gettimeofday(&eta_tv, NULL);
 724
 725         pfds = malloc(nr_clients * sizeof(struct pollfd));
 726
 727         while (!exit_backend && nr_clients) {
 728                 i = 0;
 729                 flist_for_each(entry, &client_list) {
 730                         client = flist_entry(entry, struct fio_client, list);
 731
 732                         pfds[i].fd = client->fd;
 733                         pfds[i].events = POLLIN;
 734                         i++;
 735                 }
 736
 737                 assert(i == nr_clients);
 738
 739                 do {
 740                         struct timeval tv;
 741
 742                         gettimeofday(&tv, NULL);
 743                         if (mtime_since(&eta_tv, &tv) >= 900) {
 744                                 request_client_etas();
 745                                 memcpy(&eta_tv, &tv, sizeof(tv));
 746                         }
 747
 748                         ret = poll(pfds, nr_clients, 100);
 749                         if (ret < 0) {
 750                                 if (errno == EINTR)
 751                                         continue;
 752                                 log_err("fio: poll clients: %s\n", strerror(errno));
 753                                 break;
 754                         } else if (!ret)
 755                                 continue;
 756                 } while (ret <= 0);
 757
 758                 for (i = 0; i < nr_clients; i++) {
 759                         if (!(pfds[i].revents & POLLIN))
 760                                 continue;
 761
 762                         client = find_client_by_fd(pfds[i].fd);
 763                         if (!client) {
 764                                 log_err("fio: unknown client fd %d\n", pfds[i].fd);
 765                                 continue;
 766                         }
 767                         if (!handle_client(client)) {
 768                                 log_info("client: host=%s disconnected\n",
 769                                                 client->hostname);
 770                                 remove_client(client);
 771                         }
 772                 }
 773         }
 774
 775         free(pfds);
 776         return 0;
 777 }