src/PVE/Daemon.pm

   1 package PVE::Daemon;
   2
   3 # Abstract class to implement Daemons
   4 #
   5 # Features:
   6 # * lock and write PID file /var/run/$name.pid to make sure onyl
   7 #   one instance is running.
   8 # * keep lock open during restart
   9 # * correctly daemonize (redirect STDIN/STDOUT)
  10 # * restart by stop/start, exec, or signal HUP
  11 # * daemon restart on error (option 'restart_on_error')
  12 # * handle worker processes (option 'max_workers')
  13 # * allow to restart while workers are still runningl
  14 #   (option 'leave_children_open_on_reload')
  15 # * run as different user using setuid/setgid
  16
  17 use strict;
  18 use warnings;
  19 use English;
  20
  21 use PVE::SafeSyslog;
  22 use PVE::INotify;
  23
  24 use POSIX ":sys_wait_h";
  25 use Fcntl ':flock';
  26 use Socket qw(IPPROTO_TCP TCP_NODELAY SOMAXCONN);
  27 use IO::Socket::IP;
  28
  29 use Getopt::Long;
  30 use Time::HiRes qw (gettimeofday);
  31
  32 use base qw(PVE::CLIHandler);
  33
  34 $ENV{'PATH'} = '/sbin:/bin:/usr/sbin:/usr/bin';
  35
  36 my $daemon_initialized = 0; # we only allow one instance
  37 my $daemon_sockets = [];
  38
  39 my $close_daemon_lock = sub {
  40     my ($self) = @_;
  41
  42     return if !$self->{daemon_lock_fh};
  43
  44     close $self->{daemon_lock_fh};
  45     delete $self->{daemon_lock_fh};
  46 };
  47
  48 my $log_err = sub {
  49     my ($msg) = @_;
  50     chomp $msg;
  51     print STDERR "$msg\n";
  52     syslog('err', "%s", $msg);
  53 };
  54
  55 # call this if you fork() from child
  56 # Note: we already call this for workers, so it is only required
  57 # if you fork inside a simple daemon (max_workers == 0).
  58 sub after_fork_cleanup {
  59     my ($self) = @_;
  60
  61     &$close_daemon_lock($self);
  62
  63     PVE::INotify::inotify_close();
  64
  65     for my $sig (qw(CHLD HUP INT TERM QUIT)) {
  66         $SIG{$sig} = 'DEFAULT'; # restore default handler
  67         # AnyEvent signals only works if $SIG{XX} is
  68         # undefined (perl event loop)
  69         delete $SIG{$sig}; # so that we can handle events with AnyEvent
  70     }
  71 }
  72
  73 my $lockpidfile = sub {
  74     my ($self) = @_;
  75
  76     my $lkfn = $self->{pidfile} . ".lock";
  77
  78     my $waittime = 0;
  79
  80     if (my $fd = $self->{env_pve_lock_fd}) {
  81
  82         $self->{daemon_lock_fh} = IO::Handle->new_from_fd($fd, "a");
  83
  84     } else {
  85
  86         $waittime = 5;
  87         $self->{daemon_lock_fh} = IO::File->new(">>$lkfn");
  88     }
  89
  90     if (!$self->{daemon_lock_fh}) {
  91         die "can't open lock '$lkfn' - $!\n";
  92     }
  93
  94     for (my $i = 0; $i < $waittime; $i ++) {
  95         return if flock ($self->{daemon_lock_fh}, LOCK_EX|LOCK_NB);
  96         sleep(1);
  97     }
  98
  99     if (!flock ($self->{daemon_lock_fh}, LOCK_EX|LOCK_NB)) {
 100         &$close_daemon_lock($self);
 101         my $err = $!;
 102
 103         my ($running, $pid) = $self->running();
 104         if ($running) {
 105             die "can't aquire lock '$lkfn' - daemon already started (pid = $pid)\n";
 106         } else {
 107             die "can't aquire lock '$lkfn' - $err\n";
 108         }
 109     }
 110 };
 111
 112 my $writepidfile = sub {
 113     my ($self) = @_;
 114
 115     my $pidfile = $self->{pidfile};
 116
 117     die "can't open pid file '$pidfile' - $!\n" if !open (PIDFH, ">$pidfile");
 118
 119     print PIDFH "$$\n";
 120     close (PIDFH);
 121 };
 122
 123 my $server_cleanup = sub {
 124     my ($self) = @_;
 125
 126     unlink $self->{pidfile} . ".lock";
 127     unlink $self->{pidfile};
 128 };
 129
 130 my $finish_workers = sub {
 131     my ($self) = @_;
 132
 133     foreach my $id (qw(workers old_workers)) {
 134         foreach my $cpid (keys %{$self->{$id}}) {
 135             my $waitpid = waitpid($cpid, WNOHANG);
 136             if (defined($waitpid) && ($waitpid == $cpid)) {
 137                 delete ($self->{$id}->{$cpid});
 138                 syslog('info', "worker $cpid finished");
 139             }
 140         }
 141     }
 142 };
 143
 144 my $start_workers = sub {
 145     my ($self) = @_;
 146
 147     return if $self->{terminate};
 148
 149     my $count = scalar keys %{$self->{workers}};
 150     my $need = $self->{max_workers} - $count;
 151
 152     return if $need <= 0;
 153
 154     syslog('info', "starting $need worker(s)");
 155
 156     while ($need > 0) {
 157         my $pid = fork;
 158
 159         if (!defined ($pid)) {
 160             syslog('err', "can't fork worker");
 161             sleep (1);
 162         } elsif ($pid) { # parent
 163             $self->{workers}->{$pid} = 1;
 164             syslog('info', "worker $pid started");
 165             $need--;
 166         } else {
 167             $0 = "$self->{name} worker";
 168
 169             $self->after_fork_cleanup();
 170
 171             eval { $self->run(); };
 172             if (my $err = $@) {
 173                 syslog('err', $err);
 174                 sleep(5); # avoid fast restarts
 175             }
 176
 177             syslog('info', "worker exit");
 178             exit (0);
 179         }
 180     }
 181 };
 182
 183 my $terminate_old_workers = sub {
 184     my ($self) = @_;
 185
 186     # if list is empty kill sends no signal, so no checks needed
 187     kill 15, keys %{$self->{old_workers}};
 188 };
 189
 190 my $terminate_server = sub {
 191     my ($self, $allow_open_children) = @_;
 192
 193     $self->{terminate} = 1; # set flag to avoid worker restart
 194
 195     eval { $self->shutdown(); };
 196     warn $@ if $@;
 197
 198     return if !$self->{max_workers}; # if we have no workers we're done here
 199
 200     # if configured, leave children running on HUP
 201     return if $allow_open_children && $self->{leave_children_open_on_reload};
 202
 203     # else send TERM to all (old and current) child workers
 204     kill 15, keys %{$self->@{'workers','old_workers'}};
 205
 206     # nicely shutdown childs (give them max 10 seconds to shut down)
 207     my $previous_alarm = alarm(10);
 208     eval {
 209         local $SIG{ALRM} = sub { die "timeout\n" };
 210
 211         while ((my $pid = waitpid (-1, 0)) > 0) {
 212             foreach my $id (qw(workers old_workers)) {
 213                 if (defined($self->{$id}->{$pid})) {
 214                     delete($self->{$id}->{$pid});
 215                     syslog('info', "worker $pid finished");
 216                 }
 217             }
 218         }
 219         alarm(0); # avoid race condition
 220     };
 221     my $err = $@;
 222
 223     alarm ($previous_alarm);
 224
 225     if ($err) {
 226         syslog('err', "error stopping workers (will kill them now) - $err");
 227         foreach my $id (qw(workers old_workers)) {
 228             foreach my $cpid (keys %{$self->{$id}}) {
 229                 # KILL childs still alive!
 230                 if (kill (0, $cpid)) {
 231                     delete($self->{$id}->{$cpid});
 232                     syslog("err", "kill worker $cpid");
 233                     kill(9, $cpid);
 234                     # fixme: waitpid?
 235                 }
 236             }
 237         }
 238     }
 239 };
 240
 241 sub setup {
 242     my ($self) = @_;
 243
 244     initlog($self->{name});
 245
 246     my $restart = $ENV{RESTART_PVE_DAEMON};
 247     delete $ENV{RESTART_PVE_DAEMON};
 248     $self->{env_restart_pve_daemon} = $restart;
 249
 250     my $lockfd = $ENV{PVE_DAEMON_LOCK_FD};
 251     delete $ENV{PVE_DAEMON_LOCK_FD};
 252     if (defined($lockfd)) {
 253         die "unable to parse lock fd '$lockfd'\n"
 254             if $lockfd !~ m/^(\d+)$/;
 255         $lockfd = $1; # untaint
 256     }
 257     $self->{env_pve_lock_fd} = $lockfd;
 258
 259     die "please run as root\n" if !$restart && ($> != 0);
 260
 261     die "can't create more that one PVE::Daemon" if $daemon_initialized;
 262     $daemon_initialized = 1;
 263
 264     PVE::INotify::inotify_init();
 265
 266     if (my $gidstr = $self->{setgid}) {
 267         my $gid = getgrnam($gidstr) || die "getgrnam failed - $!\n";
 268         POSIX::setgid($gid) || die "setgid $gid failed - $!\n";
 269         $EGID = "$gid $gid"; # this calls setgroups
 270         # just to be sure
 271         die "detected strange gid\n" if !($GID eq "$gid $gid" && $EGID eq "$gid $gid");
 272     }
 273
 274     if (my $uidstr = $self->{setuid}) {
 275         my $uid = getpwnam($uidstr) || die "getpwnam failed - $!\n";
 276         POSIX::setuid($uid) || die "setuid $uid failed - $!\n";
 277         # just to be sure
 278         die "detected strange uid\n" if !($UID == $uid && $EUID == $uid);
 279     }
 280
 281     if ($restart && $self->{max_workers}) {
 282         if (my $wpids = $ENV{PVE_DAEMON_WORKER_PIDS}) {
 283             $self->{old_workers}->{$_} = 1 foreach (split(':', $wpids));
 284         }
 285     }
 286
 287     $self->{nodename} = PVE::INotify::nodename();
 288 }
 289
 290 my $server_run = sub {
 291     my ($self, $debug) = @_;
 292
 293     # fixme: handle restart lockfd
 294     &$lockpidfile($self);
 295
 296     # remove FD_CLOEXEC bit to reuse on exec
 297     $self->{daemon_lock_fh}->fcntl(Fcntl::F_SETFD(), 0);
 298
 299     $ENV{PVE_DAEMON_LOCK_FD} = $self->{daemon_lock_fh}->fileno;
 300
 301     # run in background
 302     my $spid;
 303
 304     $self->{debug} = 1 if $debug;
 305
 306     $self->init();
 307
 308     if (!$debug) {
 309         open STDIN,  '</dev/null' || die "can't read /dev/null";
 310         open STDOUT, '>/dev/null' || die "can't write /dev/null";
 311     }
 312
 313     if (!$self->{env_restart_pve_daemon} && !$debug) {
 314         PVE::INotify::inotify_close();
 315         $spid = fork();
 316         if (!defined ($spid)) {
 317             die "can't put server into background - fork failed";
 318         } elsif ($spid) { # parent
 319             exit (0);
 320         }
 321         PVE::INotify::inotify_init();
 322     }
 323
 324     if ($self->{env_restart_pve_daemon}) {
 325         syslog('info' , "restarting server");
 326     } else {
 327         &$writepidfile($self);
 328         syslog('info' , "starting server");
 329     }
 330
 331     POSIX::setsid();
 332
 333     open STDERR, '>&STDOUT' || die "can't close STDERR\n";
 334
 335     my $old_sig_term = $SIG{TERM};
 336     local $SIG{TERM} = sub {
 337         local ($@, $!, $?); # do not overwrite error vars
 338         syslog('info', "received signal TERM");
 339         &$terminate_server($self, 0);
 340         &$server_cleanup($self);
 341         &$old_sig_term(@_) if $old_sig_term;
 342     };
 343
 344     my $old_sig_quit = $SIG{QUIT};
 345     local $SIG{QUIT} = sub {
 346         local ($@, $!, $?); # do not overwrite error vars
 347         syslog('info', "received signal QUIT");
 348         &$terminate_server($self, 0);
 349         &$server_cleanup($self);
 350         &$old_sig_quit(@_) if $old_sig_quit;
 351     };
 352
 353     my $old_sig_int = $SIG{INT};
 354     local $SIG{INT} = sub {
 355         local ($@, $!, $?); # do not overwrite error vars
 356         syslog('info', "received signal INT");
 357         $SIG{INT} = 'DEFAULT'; # allow to terminate now
 358         &$terminate_server($self, 0);
 359         &$server_cleanup($self);
 360         &$old_sig_int(@_) if $old_sig_int;
 361     };
 362
 363     $SIG{HUP} = sub {
 364         local ($@, $!, $?); # do not overwrite error vars
 365         syslog('info', "received signal HUP");
 366         $self->{got_hup_signal} = 1;
 367         if ($self->{max_workers}) {
 368             &$terminate_server($self, 1);
 369         } elsif ($self->can('hup')) {
 370             eval { $self->hup() };
 371             warn $@ if $@;
 372         }
 373     };
 374
 375     eval {
 376         if ($self->{max_workers}) {
 377             my $old_sig_chld = $SIG{CHLD};
 378             local $SIG{CHLD} = sub {
 379                 local ($@, $!, $?); # do not overwrite error vars
 380                 &$finish_workers($self);
 381                 &$old_sig_chld(@_) if $old_sig_chld;
 382             };
 383
 384             # now loop forever (until we receive terminate signal)
 385             for (;;) {
 386                 &$start_workers($self);
 387                 sleep(5);
 388                 &$terminate_old_workers($self);
 389                 &$finish_workers($self);
 390                 last if $self->{terminate};
 391             }
 392
 393         } else {
 394             $self->run();
 395         }
 396     };
 397     my $err = $@;
 398
 399     if ($err) {
 400         syslog ('err', "ERROR: $err");
 401
 402         &$terminate_server($self, 1);
 403
 404         if (my $wait_time = $self->{restart_on_error}) {
 405             $self->restart_daemon($wait_time);
 406         } else {
 407             $self->exit_daemon(-1);
 408         }
 409     }
 410
 411     if ($self->{got_hup_signal}) {
 412         $self->restart_daemon();
 413     } else {
 414         $self->exit_daemon(0);
 415     }
 416 };
 417
 418 sub new {
 419     my ($this, $name, $cmdline, %params) = @_;
 420
 421     $name = 'daemon' if !$name; # should not happen
 422
 423     my $self;
 424
 425     eval {
 426         my $class = ref($this) || $this;
 427
 428         $self = bless {
 429             name => $name,
 430             pidfile => "/var/run/${name}.pid",
 431             workers => {},
 432             old_workers => {},
 433         }, $class;
 434
 435
 436         foreach my $opt (keys %params) {
 437             my $value = $params{$opt};
 438             if ($opt eq 'restart_on_error') {
 439                 $self->{$opt} = $value;
 440             } elsif ($opt eq 'stop_wait_time') {
 441                 $self->{$opt} = $value;
 442             } elsif ($opt eq 'pidfile') {
 443                 $self->{$opt} = $value;
 444             } elsif ($opt eq 'max_workers') {
 445                 $self->{$opt} = $value;
 446             } elsif ($opt eq 'leave_children_open_on_reload') {
 447                 $self->{$opt} = $value;
 448             } elsif ($opt eq 'setgid') {
 449                 $self->{$opt} = $value;
 450             } elsif ($opt eq 'setuid') {
 451                 $self->{$opt} = $value;
 452             } else {
 453                 die "unknown daemon option '$opt'\n";
 454             }
 455         }
 456
 457
 458         # untaint
 459         $self->{cmdline} = [map { /^(.*)$/ } @$cmdline];
 460
 461         $0 = $name;
 462     };
 463     if (my $err = $@) {
 464         &$log_err($err);
 465         exit(-1);
 466     }
 467
 468     return $self;
 469 }
 470
 471 sub exit_daemon {
 472     my ($self, $status) = @_;
 473
 474     syslog("info", "server stopped");
 475
 476     &$server_cleanup($self);
 477
 478     exit($status);
 479 }
 480
 481 sub restart_daemon {
 482     my ($self, $waittime) = @_;
 483
 484     syslog('info', "server shutdown (restart)");
 485
 486     $ENV{RESTART_PVE_DAEMON} = 1;
 487
 488     foreach my $ds (@$daemon_sockets) {
 489         $ds->fcntl(Fcntl::F_SETFD(), 0);
 490     }
 491
 492     if ($self->{max_workers}) {
 493         my @workers = (keys %{$self->{workers}}, keys %{$self->{old_workers}});
 494         $ENV{PVE_DAEMON_WORKER_PIDS} = join(':', @workers);
 495     }
 496
 497     sleep($waittime) if $waittime; # avoid high server load due to restarts
 498
 499     PVE::INotify::inotify_close();
 500
 501     exec (@{$self->{cmdline}});
 502
 503     exit (-1); # never reached?
 504 }
 505
 506 # please overwrite in subclass
 507 # this is called at startup - before forking
 508 sub init {
 509     my ($self) = @_;
 510
 511 }
 512
 513 # please overwrite in subclass
 514 sub shutdown {
 515     my ($self) = @_;
 516
 517     syslog('info' , "server closing");
 518
 519     if (!$self->{max_workers}) {
 520         # wait for children
 521         1 while (waitpid(-1, POSIX::WNOHANG()) > 0);
 522     }
 523 }
 524
 525 # please define in subclass
 526 #sub hup {
 527 #    my ($self) = @_;
 528 #
 529 #    syslog('info' , "received signal HUP (restart)");
 530 #}
 531
 532 # please overwrite in subclass
 533 sub run {
 534     my ($self) = @_;
 535
 536     for (;;) { # forever
 537         syslog('info' , "server is running");
 538         sleep(5);
 539     }
 540 }
 541
 542 sub start {
 543     my ($self, $debug) = @_;
 544
 545     eval  {
 546         $self->setup();
 547         &$server_run($self, $debug);
 548     };
 549     if (my $err = $@) {
 550         &$log_err("start failed - $err");
 551         exit(-1);
 552     }
 553 }
 554
 555 my $read_pid = sub {
 556     my ($self) = @_;
 557
 558     my $pid_str = PVE::Tools::file_read_firstline($self->{pidfile});
 559
 560     return 0 if !$pid_str;
 561
 562     return 0 if $pid_str !~ m/^(\d+)$/; # untaint
 563
 564     my $pid = int($1);
 565
 566     return $pid;
 567 };
 568
 569 # checks if the process was started by systemd
 570 my $init_ppid = sub {
 571
 572     if (getppid() == 1) {
 573        return 1;
 574     } else {
 575        return 0;
 576     }
 577 };
 578
 579 sub running {
 580     my ($self) = @_;
 581
 582     my $pid = &$read_pid($self);
 583
 584     if ($pid) {
 585         my $res = PVE::ProcFSTools::check_process_running($pid) ? 1 : 0;
 586         return wantarray ? ($res, $pid) : $res;
 587     }
 588
 589     return wantarray ? (0, 0) : 0;
 590 }
 591
 592 sub stop {
 593     my ($self) = @_;
 594
 595     my $pid = &$read_pid($self);
 596
 597     return if !$pid;
 598
 599     if (PVE::ProcFSTools::check_process_running($pid)) {
 600         kill(15, $pid); # send TERM signal
 601         # give some time
 602         my $wait_time = $self->{stop_wait_time} || 5;
 603         my $running = 1;
 604         for (my $i = 0; $i < $wait_time; $i++) {
 605             $running = PVE::ProcFSTools::check_process_running($pid);
 606             last if !$running;
 607             sleep (1);
 608         }
 609
 610         syslog('err', "server still running - send KILL") if $running;
 611
 612         # to be sure
 613         kill(9, $pid);
 614         waitpid($pid, 0);
 615     }
 616
 617     if (-f $self->{pidfile}) {
 618         eval {
 619             # try to get the lock
 620             &$lockpidfile($self);
 621             &$server_cleanup($self);
 622         };
 623         if (my $err = $@) {
 624             &$log_err("cleanup failed - $err");
 625         }
 626     }
 627 }
 628
 629 sub register_start_command {
 630     my ($self, $description) = @_;
 631
 632     my $class = ref($self);
 633
 634     $class->register_method({
 635         name => 'start',
 636         path => 'start',
 637         method => 'POST',
 638         description => $description || "Start the daemon.",
 639         parameters => {
 640             additionalProperties => 0,
 641             properties => {
 642                 debug => {
 643                     description => "Debug mode - stay in foreground",
 644                     type => "boolean",
 645                     optional => 1,
 646                     default => 0,
 647                 },
 648             },
 649         },
 650         returns => { type => 'null' },
 651
 652         code => sub {
 653             my ($param) = @_;
 654
 655             if (&$init_ppid() || $param->{debug}) {
 656                 $self->start($param->{debug});
 657             } else {
 658                 PVE::Tools::run_command(['systemctl', 'start', $self->{name}]);
 659             }
 660
 661             return undef;
 662         }});
 663 }
 664
 665 my $reload_daemon = sub {
 666     my ($self, $use_hup) = @_;
 667
 668     if ($self->{env_restart_pve_daemon}) {
 669         $self->start();
 670     } else {
 671         my ($running, $pid) = $self->running();
 672         if (!$running) {
 673             $self->start();
 674         } else {
 675             if ($use_hup) {
 676                 syslog('info', "send HUP to $pid");
 677                 kill 1, $pid;
 678             } else {
 679                 $self->stop();
 680                 $self->start();
 681             }
 682         }
 683     }
 684 };
 685
 686 sub register_restart_command {
 687     my ($self, $use_hup, $description) = @_;
 688
 689     my $class = ref($self);
 690
 691     $class->register_method({
 692         name => 'restart',
 693         path => 'restart',
 694         method => 'POST',
 695         description => $description || "Restart the daemon (or start if not running).",
 696         parameters => {
 697             additionalProperties => 0,
 698             properties => {},
 699         },
 700         returns => { type => 'null' },
 701
 702         code => sub {
 703             my ($param) = @_;
 704
 705             if (&$init_ppid()) {
 706                 &$reload_daemon($self, $use_hup);
 707             } else {
 708                 PVE::Tools::run_command(['systemctl', $use_hup ? 'reload-or-restart' : 'restart', $self->{name}]);
 709             }
 710
 711             return undef;
 712         }});
 713 }
 714
 715 sub register_reload_command {
 716     my ($self, $description) = @_;
 717
 718     my $class = ref($self);
 719
 720     $class->register_method({
 721         name => 'reload',
 722         path => 'reload',
 723         method => 'POST',
 724         description => $description || "Reload daemon configuration (or start if not running).",
 725         parameters => {
 726             additionalProperties => 0,
 727             properties => {},
 728         },
 729         returns => { type => 'null' },
 730
 731         code => sub {
 732             my ($param) = @_;
 733
 734             &$reload_daemon($self, 1);
 735
 736             return undef;
 737         }});
 738 }
 739
 740 sub register_stop_command {
 741     my ($self, $description) = @_;
 742
 743     my $class = ref($self);
 744
 745     $class->register_method({
 746         name => 'stop',
 747         path => 'stop',
 748         method => 'POST',
 749         description => $description || "Stop the daemon.",
 750         parameters => {
 751             additionalProperties => 0,
 752             properties => {},
 753         },
 754         returns => { type => 'null' },
 755
 756         code => sub {
 757             my ($param) = @_;
 758
 759             if (&$init_ppid()) {
 760                 $self->stop();
 761             } else {
 762                 PVE::Tools::run_command(['systemctl', 'stop', $self->{name}]);
 763             }
 764
 765             return undef;
 766         }});
 767 }
 768
 769 sub register_status_command {
 770     my ($self, $description) = @_;
 771
 772     my $class = ref($self);
 773
 774     $class->register_method({
 775         name => 'status',
 776         path => 'status',
 777         method => 'GET',
 778         description => "Get daemon status.",
 779         parameters => {
 780             additionalProperties => 0,
 781             properties => {},
 782         },
 783         returns => {
 784             type => 'string',
 785             enum => ['stopped', 'running'],
 786         },
 787         code => sub {
 788             my ($param) = @_;
 789
 790             return $self->running() ? 'running' : 'stopped';
 791         }});
 792 }
 793
 794 # some useful helper
 795
 796 sub create_reusable_socket {
 797     my ($self, $port, $host, $family) = @_;
 798
 799     die "no port specifed" if !$port;
 800
 801     my ($socket, $sockfd);
 802
 803     if (defined($sockfd = $ENV{"PVE_DAEMON_SOCKET_$port"}) &&
 804         $self->{env_restart_pve_daemon}) {
 805
 806         die "unable to parse socket fd '$sockfd'\n"
 807             if $sockfd !~ m/^(\d+)$/;
 808         $sockfd = $1; # untaint
 809
 810         $socket = IO::Socket::IP->new;
 811         $socket->fdopen($sockfd, 'w') ||
 812             die "cannot fdopen file descriptor '$sockfd' - $!\n";
 813
 814         $socket->fcntl(Fcntl::F_SETFD(), Fcntl::FD_CLOEXEC);
 815     } else {
 816
 817         $socket = IO::Socket::IP->new(
 818             LocalAddr => $host,
 819             LocalPort => $port,
 820             Listen => SOMAXCONN,
 821             Family => $family,
 822             Proto  => 'tcp',
 823             GetAddrInfoFlags => 0,
 824             ReuseAddr => 1) ||
 825             die "unable to create socket - $@\n";
 826
 827         # we often observe delays when using Nagle algorithm,
 828         # so we disable that to maximize performance
 829         setsockopt($socket, IPPROTO_TCP, TCP_NODELAY, 1);
 830
 831         $ENV{"PVE_DAEMON_SOCKET_$port"} = $socket->fileno;
 832     }
 833
 834     push @$daemon_sockets, $socket;
 835
 836     return $socket;
 837 }
 838
 839
 840 1;
 841