1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
|
/*
* pseudo_server.c, pseudo's server-side logic and message handling
*
* Copyright (c) 2008-2010, 2013 Wind River Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Lesser GNU General Public License version 2.1 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the Lesser GNU General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* version 2.1 along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <signal.h>
#include "pseudo.h"
#include "pseudo_ipc.h"
#include "pseudo_server.h"
#include "pseudo_client.h"
#include "pseudo_db.h"
static int listen_fd = -1;
typedef struct {
int fd;
pid_t pid;
char *tag;
char *program;
} pseudo_client_t;
pseudo_client_t *clients;
/* active_clients: Number of clients we actually have right now.
* highest_client: Highest index into clients table of an active client.
* max_clients: Size of table.
*/
static int active_clients = 0, highest_client = 0, max_clients = 0;
#define LOOP_DELAY 2
#define DEFAULT_PSEUDO_SERVER_TIMEOUT 30
int pseudo_server_timeout = DEFAULT_PSEUDO_SERVER_TIMEOUT;
static int die_peacefully = 0;
static int die_forcefully = 0;
/* when the client is linked with pseudo_wrappers, these are defined there.
* when it is linked with pseudo_server, though, we have to provide different
* versions (pseudo_wrappers must not be linked with the server, or Bad Things
* happen).
*/
void pseudo_magic(void) { }
void pseudo_antimagic(void) { }
void
quit_now(int signal) {
pseudo_diag("Received signal %d, quitting.\n", signal);
die_forcefully = 1;
}
static int messages = 0, responses = 0;
static struct timeval message_time = { .tv_sec = 0 };
static void pseudo_server_loop(void);
/* helper function to make a directory, just like mkdir -p.
* Can't use system() because the child shell would end up trying
* to do the same thing...
*/
static void
mkdir_p(char *path) {
size_t len = strlen(path);
size_t i;
for (i = 1; i < len; ++i) {
/* try to create all the directories in path, ignoring
* failures
*/
if (path[i] == '/') {
path[i] = '\0';
(void) mkdir(path, 0755);
path[i] = '/';
}
}
(void) mkdir(path, 0755);
}
static int
pseudo_server_write_pid(pid_t pid) {
char *pseudo_path;
FILE *fp;
pseudo_path = pseudo_localstatedir_path(PSEUDO_PIDFILE);
if (!pseudo_path) {
pseudo_diag("Couldn't get path for prefix/%s\n", PSEUDO_PIDFILE);
return 1;
}
fp = fopen(pseudo_path, "w");
if (!fp) {
pseudo_diag("Couldn't open %s: %s\n",
pseudo_path, strerror(errno));
return 1;
}
fprintf(fp, "%lld\n", (long long) pid);
fclose(fp);
free(pseudo_path);
return 0;
}
static sig_atomic_t got_sigusr1 = 0;
static sig_atomic_t got_sigalrm = 0;
static void
handle_sigusr1(int sig) {
(void) sig;
got_sigusr1 = 1;
}
static void
handle_sigalrm(int sig) {
(void) sig;
got_sigalrm = 1;
}
#define PSEUDO_CHILD_PROCESS_TIMEOUT 2
int
pseudo_server_start(int daemonize) {
struct sockaddr_un sun = { .sun_family = AF_UNIX, .sun_path = PSEUDO_SOCKET };
char *pseudo_path;
int newfd, lockfd;
int rc, save_errno;
char *lockname;
char *lockpath;
struct flock lock_data;
/* we want a sane umask for server operations; this is what
* would control the modes of database files, sockets, and so
* on.
*/
umask(022);
/* parent process will wait for child process, or until it gets
* SIGUSR1, or until too much time has passed. */
if (daemonize) {
int child;
/* make startup messages go away when invoked-as-daemon */
pseudo_debug_logfile(PSEUDO_LOGFILE, 2);
child = fork();
if (child == -1) {
pseudo_diag("Couldn't fork child process: %s\n",
strerror(errno));
exit(PSEUDO_EXIT_FORK_FAILED);
}
if (child) {
int status;
int rc;
int save_errno;
got_sigusr1 = 0;
signal(SIGUSR1, handle_sigusr1);
signal(SIGALRM, handle_sigalrm);
alarm(PSEUDO_CHILD_PROCESS_TIMEOUT);
int tries = 0;
do {
rc = waitpid(child, &status, WNOHANG);
save_errno = errno;
if (rc != child && !got_sigalrm && !got_sigusr1) {
struct timespec delay = { .tv_sec = 0, .tv_nsec = 100000 };
nanosleep(&delay, NULL);
++tries;
}
} while (!got_sigalrm && !got_sigusr1 && rc != child);
alarm(0);
pseudo_debug(PDBGF_SERVER, "pid waited: %d/%d [%d tries], status %d, usr1 %d, alrm %d\n",
rc, save_errno, tries, status,
got_sigusr1, got_sigalrm);
if (got_sigusr1) {
pseudo_debug(PDBGF_SERVER, "server says it's ready.\n");
exit(0);
}
if (got_sigalrm) {
pseudo_diag("Child process timeout after %d seconds.\n",
PSEUDO_CHILD_PROCESS_TIMEOUT);
exit(PSEUDO_EXIT_TIMEOUT);
}
if (rc == -1) {
pseudo_diag("Failure in waitpid(): %s\n",
strerror(save_errno));
exit(PSEUDO_EXIT_WAITPID);
}
if (WIFSIGNALED(status)) {
status = WTERMSIG(status);
pseudo_diag("Child process exited from signal %d.\n",
status);
kill(getpid(), status);
/* can't use +128 because that's not valid */
exit(status + 64);
}
if (WIFEXITED(status)) {
status = WEXITSTATUS(status);
pseudo_diag("Child process exit status %d: %s\n",
status,
pseudo_exit_status_name(status));
if (status == 0) {
pseudo_diag("Hang on, server should not have exited 0 without sending us sigusr1?\n");
}
exit(status);
}
pseudo_diag("Unknown exit status %d.\n", status);
exit(PSEUDO_EXIT_GENERAL);
} else {
/* detach from parent session */
setsid();
fclose(stdin);
fclose(stdout);
/* and then just execute the server code normally. */
/* Any logging will presumably go to logfile, but
* exit status will make it back to the parent for
* reporting. */
}
}
pseudo_diag("pid %d [parent %d], doing new pid setup and server start\n", getpid(), getppid());
pseudo_new_pid();
pseudo_debug(PDBGF_SERVER, "opening lock.\n");
lockpath = pseudo_localstatedir_path(NULL);
if (!lockpath) {
pseudo_diag("Couldn't allocate a file path.\n");
exit(PSEUDO_EXIT_LOCK_PATH);
}
mkdir_p(lockpath);
lockname = pseudo_localstatedir_path(PSEUDO_LOCKFILE);
if (!lockname) {
pseudo_diag("Couldn't allocate a file path.\n");
exit(PSEUDO_EXIT_LOCK_PATH);
}
lockfd = open(lockname, O_RDWR | O_CREAT, 0644);
if (lockfd < 0) {
pseudo_diag("Can't open or create lockfile %s: %s\n",
lockname, strerror(errno));
exit(PSEUDO_EXIT_LOCK_FAILED);
}
free(lockname);
/* the lock shuffle has to happen before an fcntl lock, which
* is automatically dropped if *any* file descriptor on the file
* is closed...
*/
if (lockfd <= 2) {
newfd = fcntl(lockfd, F_DUPFD, 3);
if (newfd < 0) {
pseudo_diag("Can't move lockfile to safe descriptor, leaving it on %d: %s\n",
lockfd, strerror(errno));
} else {
close(lockfd);
lockfd = newfd;
}
}
pseudo_debug(PDBGF_SERVER, "acquiring lock.\n");
memset(&lock_data, 0, sizeof(lock_data));
lock_data.l_type = F_WRLCK;
lock_data.l_whence = SEEK_SET;
lock_data.l_start = 0;
lock_data.l_len = 0;
rc = fcntl(lockfd, F_SETLK, &lock_data);
if (rc < 0) {
save_errno = errno;
if (save_errno == EACCES || save_errno == EAGAIN) {
rc = fcntl(lockfd, F_GETLK, &lock_data);
if (rc == 0 && lock_data.l_type != F_UNLCK) {
pseudo_diag("lock already held by existing pid %d.\n",
lock_data.l_pid);
}
}
pseudo_diag("Couldn't obtain lock: %s.\n", strerror(save_errno));
exit(PSEUDO_EXIT_LOCK_HELD);
} else {
pseudo_debug(PDBGF_SERVER, "Acquired lock.\n");
}
#if PSEUDO_PORT_DARWIN
sun.sun_len = strlen(PSEUDO_SOCKET) + 1;
#endif
listen_fd = socket(PF_UNIX, SOCK_STREAM, 0);
if (listen_fd < 0) {
pseudo_diag("couldn't create listening socket: %s\n", strerror(errno));
exit(PSEUDO_EXIT_SOCKET_CREATE);
}
if (listen_fd <= 2) {
newfd = fcntl(listen_fd, F_DUPFD, 3);
if (newfd < 0) {
pseudo_diag("couldn't dup listening socket: %s\n", strerror(errno));
close(listen_fd);
exit(PSEUDO_EXIT_SOCKET_FD);
} else {
close(listen_fd);
listen_fd = newfd;
}
}
/* cd to the data directory */
pseudo_path = pseudo_localstatedir_path(NULL);
if (!pseudo_path || chdir(pseudo_path) == -1) {
pseudo_diag("can't get to '%s': %s\n",
pseudo_path, strerror(errno));
exit(PSEUDO_EXIT_SOCKET_PATH);
}
free(pseudo_path);
/* remove existing socket -- if it exists */
rc = unlink(sun.sun_path);
if (rc == -1 && errno != ENOENT) {
pseudo_diag("Can't unlink existing socket: %s.\n",
strerror(errno));
exit(PSEUDO_EXIT_SOCKET_UNLINK);
}
if (bind(listen_fd, (struct sockaddr *) &sun, sizeof(sun)) == -1) {
pseudo_diag("couldn't bind listening socket: %s\n", strerror(errno));
exit(PSEUDO_EXIT_SOCKET_BIND);
}
if (listen(listen_fd, 5) == -1) {
pseudo_diag("couldn't listen on socket: %s\n", strerror(errno));
exit(PSEUDO_EXIT_SOCKET_LISTEN);
}
rc = pseudo_server_write_pid(getpid());
if (rc != 0) {
pseudo_diag("warning: couldn't write pid file.\n");
}
signal(SIGHUP, quit_now);
signal(SIGINT, quit_now);
signal(SIGALRM, quit_now);
signal(SIGQUIT, quit_now);
signal(SIGTERM, quit_now);
/* tell parent process to stop waiting */
if (daemonize) {
pid_t ppid = getppid();
if (ppid == 1) {
pseudo_diag("Setup complete, but parent is init, not sending SIGUSR1.\n");
} else {
pseudo_diag("Setup complete, sending SIGUSR1 to pid %d.\n",
ppid);
kill(ppid, SIGUSR1);
}
}
pseudo_server_loop();
return 0;
}
/* mess with internal tables as needed */
static void
open_client(int fd) {
pseudo_client_t *new_clients;
int i;
/* if possible, use first open client slot */
for (i = 0; i < max_clients; ++i) {
if (clients[i].fd == -1) {
pseudo_debug(PDBGF_SERVER, "reusing client %d for fd %d\n", i, fd);
clients[i].fd = fd;
clients[i].pid = 0;
clients[i].tag = NULL;
clients[i].program = NULL;
++active_clients;
if (i > highest_client)
highest_client = i;
return;
}
}
/* otherwise, allocate a new one */
new_clients = malloc(sizeof(*new_clients) * (max_clients + 16));
if (new_clients) {
memcpy(new_clients, clients, max_clients * sizeof(*clients));
free(clients);
for (i = max_clients; i < max_clients + 16; ++i) {
new_clients[i].fd = -1;
new_clients[i].pid = 0;
new_clients[i].tag = NULL;
new_clients[i].program = NULL;
}
clients = new_clients;
clients[max_clients].fd = fd;
clients[max_clients].pid = 0;
clients[max_clients].tag = NULL;
clients[max_clients].program = NULL;
highest_client = max_clients + 1;
max_clients += 16;
++active_clients;
} else {
pseudo_diag("error allocating new client, fd %d\n", fd);
close(fd);
}
}
/* clear pid/fd. If this was the highest client, iterate downwards looking
* for a lower one to be the new highest client.
*/
static void
close_client(int client) {
pseudo_debug(PDBGF_SERVER, "lost client %d [%d], closing fd %d\n", client,
clients[client].pid, clients[client].fd);
/* client went away... */
if (client > highest_client || client <= 0) {
pseudo_diag("tried to close client %d (highest is %d)\n",
client, highest_client);
return;
}
close(clients[client].fd);
clients[client].fd = -1;
free(clients[client].tag);
free(clients[client].program);
clients[client].pid = 0;
clients[client].tag = NULL;
clients[client].program = NULL;
--active_clients;
if (client == highest_client)
while (clients[highest_client].fd != -1 && highest_client > 0)
--highest_client;
}
/* Actually process a request.
*/
static int
serve_client(int i) {
pseudo_msg_t *in;
int rc;
pseudo_debug(PDBGF_SERVER, "message from client %d [%d:%s - %s] fd %d\n",
i, (int) clients[i].pid,
clients[i].program ? clients[i].program : "???",
clients[i].tag ? clients[i].tag : "NO TAG",
clients[i].fd);
in = pseudo_msg_receive(clients[i].fd);
if (in) {
char *response_path = 0;
size_t response_pathlen;
int send_response = 1;
pseudo_debug(PDBGF_SERVER | PDBGF_VERBOSE, "got a message (%d): %s\n", in->type, (in->pathlen ? in->path : "<no path>"));
/* handle incoming ping */
if (in->type == PSEUDO_MSG_PING && !clients[i].pid) {
pseudo_debug(PDBGF_SERVER, "new client: %d -> %d",
i, in->client);
clients[i].pid = in->client;
if (in->pathlen) {
size_t proglen;
proglen = strlen(in->path);
pseudo_debug(PDBGF_SERVER, " <%s>", in->path);
free(clients[i].program);
clients[i].program = malloc(proglen + 1);
if (clients[i].program) {
snprintf(clients[i].program, proglen + 1, "%s", in->path);
}
if (in->pathlen > proglen) {
pseudo_debug(PDBGF_SERVER, " [%s]", in->path + proglen + 1);
clients[i].tag = malloc(in->pathlen - proglen);
if (clients[i].tag)
snprintf(clients[i].tag, in->pathlen - proglen,
"%s", in->path + proglen + 1);
}
}
pseudo_debug(PDBGF_SERVER, "\n");
}
/* sanity-check client ID */
if (in->client != clients[i].pid) {
pseudo_debug(PDBGF_SERVER, "uh-oh, expected pid %d for client %d, got %d\n",
(int) clients[i].pid, i, in->client);
}
/* regular requests are processed in place by
* pseudo_server_response.
*/
if (in->type != PSEUDO_MSG_SHUTDOWN) {
if (in->type == PSEUDO_MSG_FASTOP)
send_response = 0;
/* most messages don't need these, but xattr may */
response_path = 0;
response_pathlen = -1;
if (pseudo_server_response(in, clients[i].program, clients[i].tag, &response_path, &response_pathlen)) {
in->type = PSEUDO_MSG_NAK;
} else {
in->type = PSEUDO_MSG_ACK;
pseudo_debug(PDBGF_SERVER | PDBGF_VERBOSE, "response: %d (%s)\n",
in->result, pseudo_res_name(in->result));
}
in->client = i;
if (response_path) {
in->pathlen = response_pathlen;
} else {
in->pathlen = 0;
}
} else {
/* the server's listen fd is "a client", and
* so is the program connecting to request a shutdown.
* it should never be less than 2, but crazy things
* happen. >2 implies some other active client,
* though.
*/
if (active_clients > 2) {
int j;
char *s;
response_path = malloc(8 * active_clients);
in->type = PSEUDO_MSG_NAK;
in->fd = active_clients - 2;
s = response_path;
for (j = 1; j <= highest_client; ++j) {
if (clients[j].fd != -1 && j != i) {
s += snprintf(s, 8, "%d ", (int) clients[j].pid);
}
}
in->pathlen = (s - response_path) + 1;
/* exit quickly once clients go away, though */
pseudo_server_timeout = 3;
} else {
in->type = PSEUDO_MSG_ACK;
in->pathlen = 0;
in->client = i;
die_peacefully = 1;
}
}
if (send_response) {
if ((rc = pseudo_msg_send(clients[i].fd, in, in->pathlen, response_path)) != 0) {
pseudo_debug(PDBGF_SERVER, "failed to send response to client %d [%d]: %d (%s)\n",
i, (int) clients[i].pid, rc, strerror(errno));
}
} else {
rc = 1;
}
free(response_path);
return rc;
} else {
/* this should not be happening, but the exceptions aren't
* being detected in select() for some reason.
*/
pseudo_debug(PDBGF_SERVER, "client %d: no message\n", (int) clients[i].pid);
close_client(i);
return 0;
}
}
/* get clients, handle messages, shut down.
* This doesn't actually do any work, it just calls a ton of things which
* do work.
*/
static void
pseudo_server_loop(void) {
struct sockaddr_un client;
socklen_t len;
fd_set reads, writes, events;
int max_fd, current_clients;
struct timeval timeout;
int i;
int rc;
int fd;
int loop_timeout = pseudo_server_timeout;
clients = malloc(16 * sizeof(*clients));
clients[0].fd = listen_fd;
clients[0].pid = getpid();
for (i = 1; i < 16; ++i) {
clients[i].fd = -1;
clients[i].pid = 0;
clients[i].tag = NULL;
clients[i].program = NULL;
}
active_clients = 1;
max_clients = 16;
highest_client = 0;
pseudo_debug(PDBGF_SERVER, "server loop started.\n");
if (listen_fd < 0) {
pseudo_diag("got into loop with no valid listen fd.\n");
exit(PSEUDO_EXIT_LISTEN_FD);
}
pdb_log_msg(SEVERITY_INFO, NULL, NULL, NULL, "server started (pid %d)", getpid());
FD_ZERO(&reads);
FD_ZERO(&writes);
FD_ZERO(&events);
FD_SET(clients[0].fd, &reads);
FD_SET(clients[0].fd, &events);
max_fd = clients[0].fd;
timeout = (struct timeval) { .tv_sec = LOOP_DELAY, .tv_usec = 0 };
/* EINTR tends to come from profiling, so it is not a good reason to
* exit; other signals are caught and set the flag causing a graceful
* exit. */
while ((rc = select(max_fd + 1, &reads, &writes, &events, &timeout)) >= 0 || (errno == EINTR)) {
if (rc == 0 || (rc == -1 && errno == EINTR)) {
/* If there's no clients, start timing out. If there
* are active clients, never time out.
*/
if (active_clients == 1) {
loop_timeout -= LOOP_DELAY;
/* maybe flush database to disk */
pdb_maybe_backup();
if (loop_timeout <= 0) {
pseudo_debug(PDBGF_SERVER, "no more clients, got bored.\n");
die_peacefully = 1;
} else {
/* display this if not exiting */
pseudo_debug(PDBGF_SERVER | PDBGF_BENCHMARK, "%d messages handled in %.4f seconds, %d responses\n",
messages,
(double) message_time.tv_sec +
(double) message_time.tv_usec / 1000000.0,
responses);
}
}
} else if (rc > 0) {
loop_timeout = pseudo_server_timeout;
for (i = 1; i <= highest_client; ++i) {
if (clients[i].fd == -1)
continue;
if (FD_ISSET(clients[i].fd, &events)) {
/* this should happen but doesn't... */
close_client(i);
} else if (FD_ISSET(clients[i].fd, &reads)) {
struct timeval tv1, tv2;
int rc;
gettimeofday(&tv1, NULL);
rc = serve_client(i);
gettimeofday(&tv2, NULL);
++messages;
if (rc == 0)
++responses;
message_time.tv_sec += (tv2.tv_sec - tv1.tv_sec);
message_time.tv_usec += (tv2.tv_usec - tv1.tv_usec);
if (message_time.tv_usec < 0) {
message_time.tv_usec += 1000000;
--message_time.tv_sec;
} else while (message_time.tv_usec > 1000000) {
message_time.tv_usec -= 1000000;
++message_time.tv_sec;
}
}
if (die_forcefully)
break;
}
if (!die_forcefully &&
(FD_ISSET(clients[0].fd, &events) ||
FD_ISSET(clients[0].fd, &reads))) {
len = sizeof(client);
if ((fd = accept(listen_fd, (struct sockaddr *) &client, &len)) != -1) {
/* Don't allow clients to end up on fd 2, because glibc's
* malloc debug uses that fd unconditionally.
*/
if (fd == 2) {
int newfd = fcntl(fd, F_DUPFD, 3);
close(fd);
fd = newfd;
}
pseudo_debug(PDBGF_SERVER, "new client fd %d\n", fd);
open_client(fd);
/* A new client implicitly cancels any
* previous shutdown request, or a
* shutdown for lack of clients.
*/
pseudo_server_timeout = DEFAULT_PSEUDO_SERVER_TIMEOUT;
die_peacefully = 0;
}
}
pseudo_debug(PDBGF_SERVER, "server loop complete [%d clients left]\n", active_clients);
}
if (die_peacefully || die_forcefully) {
pseudo_debug(PDBGF_SERVER, "quitting.\n");
pseudo_debug(PDBGF_SERVER | PDBGF_BENCHMARK, "server %d exiting: handled %d messages in %.4f seconds\n",
getpid(), messages,
(double) message_time.tv_sec +
(double) message_time.tv_usec / 1000000.0);
pdb_log_msg(SEVERITY_INFO, NULL, NULL, NULL, "server %d exiting: handled %d messages in %.4f seconds",
getpid(), messages,
(double) message_time.tv_sec +
(double) message_time.tv_usec / 1000000.0);
/* and at this point, we'll start refusing connections */
close(clients[0].fd);
/* This is a good place to insert a delay for
* debugging race conditions during startup. */
/* usleep(300000); */
exit(0);
}
FD_ZERO(&reads);
FD_ZERO(&writes);
FD_ZERO(&events);
FD_SET(clients[0].fd, &reads);
FD_SET(clients[0].fd, &events);
max_fd = clients[0].fd;
/* current_clients is a sanity check; note that for
* purposes of select(), the server is one of the fds,
* and thus, "a client".
*/
current_clients = 1;
for (i = 1; i <= highest_client; ++i) {
if (clients[i].fd != -1) {
++current_clients;
FD_SET(clients[i].fd, &reads);
FD_SET(clients[i].fd, &events);
if (clients[i].fd > max_fd)
max_fd = clients[i].fd;
}
}
if (current_clients != active_clients) {
pseudo_debug(PDBGF_SERVER, "miscount of current clients (%d) against active_clients (%d)?\n",
current_clients, active_clients);
}
/* reinitialize timeout because Linux select alters it */
timeout = (struct timeval) { .tv_sec = LOOP_DELAY, .tv_usec = 0 };
}
pseudo_diag("select failed: %s\n", strerror(errno));
}
|