socket.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

# 
# /*
#  * *********** WARNING **************
#  * This file generated by ModPerl::WrapXS/0.01
#  * Any changes made here will be lost
#  * ***********************************
#  * 01: lib/ModPerl/Code.pm:708
#  * 02: lib/ModPerl/WrapXS.pm:624
#  * 03: lib/ModPerl/WrapXS.pm:1173
#  * 04: Makefile.PL:423
#  * 05: Makefile.PL:325
#  * 06: Makefile.PL:56
#  */
# 


package APR::Socket;

use strict;
use warnings FATAL => 'all';


use APR ();
use APR::XSLoader ();
our $VERSION = '0.009000';
APR::XSLoader::load __PACKAGE__;



1;
__END__

=head1 NAME

APR::Socket - Perl API for APR sockets




=head1 Synopsis

  use APR::Socket ();
  
  ### set the socket to the blocking mode if it isn't already
  ### and read in the loop and echo it back
  use APR::Const -compile => qw(SO_NONBLOCK);
  if ($sock->opt_get(APR::Const::SO_NONBLOCK)) {
      $sock->opt_set(APR::Const::SO_NONBLOCK => 0);
  }
  # read from/write to the socket (w/o handling possible failures)
  my $wanted = 1024;
  while ($sock->recv(my $buff, $wanted)) {
      $sock->send($buff);
  }

  ### get/set IO timeout and try to read some data
  use APR::Const -compile => qw(TIMEUP);
  # timeout is in usecs!
  my $timeout = $sock->timeout_get();
  if ($timeout < 10_000_000) {
      $sock->timeout_set(20_000_000); # 20 secs
  }
  # now read, while handling timeouts
  my $wanted = 1024;
  my $buff;
  my $rlen = eval { $sock->recv($buff, $wanted) };
  if ($@ && ref $@ && $@ == APR::Const::TIMEUP) {
      # timeout, do something, e.g.
      warn "timed out, will try again later";
  }
  else {
      warn "asked for $wanted bytes, read $rlen bytes\n";
      # do something with the data
  }

  # non-blocking io poll
  $sock->opt_set(APR::Const::SO_NONBLOCK => 1);
  my $rc = $sock->poll($c->pool, 1_000_000, APR::Const::POLLIN);
  if ($rc == APR::Const::SUCCESS) {
      # read the data
  }
  else {
      # handle the condition
  }



=head1 Description

C<APR::Socket> provides the Perl interface to APR sockets.




=head1 API

C<APR::Socket> provides the following methods:










=head2 C<opt_get>

Query socket options for the specified socket

  $val = $sock->opt_get($opt);

=over 4

=item obj: C<$sock>
( C<L<APR::Socket object|docs::2.0::api::APR::Socket>> )

the socket object to query

=item arg1: C<$opt>
( C<L<APR::Const constant|docs::2.0::api::APR::Const/C__socket_>> )

the socket option we would like to configure.  Here are the
L<available socket options|docs::2.0::api::APR::Const/C__socket_>.

=item ret: C<$val> ( integer )

the currently set value for L<the socket
option|docs::2.0::api::APR::Const/C__socket_> you've queried for

=item excpt: C<L<APR::Error|docs::2.0::api::APR::Error>>

=item since: 2.0.00

=back

Examples can be found in L<the socket options constants
section|docs::2.0::api::APR::Const/C__socket_>. For example L<setting 
the IO to the blocking
mode|docs::2.0::api::APR::Const/C_APR__Const__SO_NONBLOCK_>.




=head2 C<opt_set>

Setup socket options for the specified socket

  $sock->opt_set($opt, $val);

=over 4

=item obj: C<$sock>
( C<L<APR::Socket object|docs::2.0::api::APR::Socket>> object )

the socket object to set up.

=item arg1: C<$opt>
( C<L<APR::Const|docs::2.0::api::APR::Const/C__socket_>> constant )

the socket option we would like to configure.  Here are the
L<available socket options|docs::2.0::api::APR::Const/C__socket_>.

=item arg2: C<$val> ( integer )

value for the option. Refer to the L<socket
options|docs::2.0::api::APR::Const/C__socket_> section to learn about
the expected values.

=item ret: no return value

=item excpt: C<L<APR::Error|docs::2.0::api::APR::Error>>

=item since: 2.0.00

=back

Examples can be found in L<the socket options constants
section|docs::2.0::api::APR::Const/C__socket_>. For example L<setting 
the IO to the blocking
mode|docs::2.0::api::APR::Const/C_APR__Const__SO_NONBLOCK_>.



=head2 C<poll>

Poll the socket for events:

    $rc = $sock->poll($pool, $timeout, $events);

=over 4

=item obj: C<$sock>
( C<L<APR::Socket object|docs::2.0::api::APR::Socket>> )

The socket to poll

=item arg1: C<$pool>
( C<L<APR::Pool object|docs::2.0::api::APR::Pool>> )

usually C<L<$c-E<gt>pool|docs::2.0::api::Apache2::Connection/C_pool_>>.

=item arg2: C<$timeout> ( integer )

The amount of time to wait (in milliseconds) for the specified events
to occur.

=item arg3: C<$events> ( C<L<APR::Const :poll
constants|docs::2.0::api::APR::Const/C__poll_>> )

The events for which to wait.

For example use
C<L<APR::Const::POLLIN|docs::2.0::api::APR::Const/C_APR__Const__POLLIN_>> to wait
for incoming data to be available,
C<L<APR::Const::POLLOUT|docs::2.0::api::APR::Const/C_APR__Const__POLLOUT_>> to wait
until it's possible to write data to the socket and
C<L<APR::Const::POLLPRI|docs::2.0::api::APR::Const/C_APR__Const__POLLPRI_>> to wait
for priority data to become available.

=item ret: C<$rc>
( C<L<APR::Const constant|docs::2.0::api::APR::Const>> )

If C<APR::Const::SUCCESS> is received than the polling was successful. If not
-- the error code is returned, which can be converted to the error
string with help of
C<L<APR::Error::strerror|docs::2.0::api::APR::Error/C_strerror_>>.

=item since: 2.0.00

=back

For example poll a non-blocking socket up to 1 second when reading
data from the client:

  use APR::Socket ();
  use APR::Connection ();
  use APR::Error ();
  
  use APR::Const -compile => qw(SO_NONBLOCK POLLIN SUCCESS TIMEUP);
  
  $sock->opt_set(APR::Const::SO_NONBLOCK => 1);
  
  my $rc = $sock->poll($c->pool, 1_000_000, APR::Const::POLLIN);
  if ($rc == APR::Const::SUCCESS) {
      # Data is waiting on the socket to be read.
      # $sock->recv(my $buf, BUFF_LEN)
  }
  elsif ($rc == APR::Const::TIMEUP) {
      # One second elapsed and still there is no data waiting to be
      # read. for example could try again.
  }
  else {
      die "poll error: " . APR::Error::strerror($rc);
  }









=head2 C<recv>

Read incoming data from the socket

  $len = $sock->recv($buffer, $wanted);

=over 4

=item obj: C<$sock>
( C<L<APR::SockAddr object|docs::2.0::api::APR::SockAddr>> object )

The socket to read from

=item arg1: C<$buffer> ( SCALAR )

The buffer to fill. All previous data will be lost.

=item arg2: C<$wanted> ( int )

How many bytes to attempt to read.

=item ret: C<$len> ( number )

How many bytes were actually read.

C<$buffer> gets populated with the string that is read. It will
contain an empty string if there was nothing to read.

=item excpt: C<L<APR::Error|docs::2.0::api::APR::Error>>

If you get the C<'(11) Resource temporarily unavailable'> error
(exception
C<L<APR::Const::EAGAIN|docs::2.0::api::APR::Const/C_APR__Const__EAGAIN_>>)
(or another equivalent, which might be different on non-POSIX
systems), then you didn't ensure that the socket is in L<a blocking IO
mode|/C_opt_set_> before using it. Note that you should use 
C<L<APR::Status::is_EAGAIN|docs::2.0::api::APR::Status/C_is_EAGAIN_>>
to perform this check (since different error codes may be returned for
the same event on different OSes). For example if the socket is set to
the non-blocking mode and there is no data right away, you may get
this exception thrown. So here is how to check for it and retry a few
times after short delays:

  use APR::Status ();
  $sock->opt_set(APR::Const::SO_NONBLOCK, 1);
  # ....
  my $tries = 0;
  my $buffer;
  RETRY: my $rlen = eval { $socket->recv($buffer, SIZE) };
  if ($@)
      die $@ unless ref $@ && APR::Status::is_EAGAIN($@);
      if ($tries++ < 3) {
          # sleep 250msec
          select undef, undef, undef, 0.25;
          goto RETRY;
      }
      else {
          # do something else
      }
  }
  warn "read $rlen bytes\n"


If timeout was set via C<timeout_set|/C_timeout_set_>, you may need to
catch the
C<L<APR::Const::TIMEUP|docs::2.0::api::APR::Const/C_APR__Const__TIMEUP_>>
exception. For example:

  use APR::Const -compile => qw(TIMEUP);
  $sock->timeout_set(1_000_000); # 1 sec
  my $buffer;
  eval { $sock->recv($buffer, $wanted) };
  if ($@ && $@ == APR::Const::TIMEUP) {
      # timeout, do something, e.g.
  }

If not handled -- you may get the error C<'70007: The timeout
specified has expired'>.

Another error condition that may occur is the C<'(104) Connection
reset by peer'> error, which is up to your application logic to decide
whether it's an error or not. This error usually happens when the
client aborts the connection.

  use APR::Const -compile => qw(ECONNABORTED);
  my $buffer;
  eval { $sock->recv($buffer, $wanted) };
  if ($@ == APR::Const::ECONNABORTED) {
      # ignore it or deal with it
  }

=item since: 2.0.00

=back

Here is the quick prototype example, which doesn't handle any errors
(mod_perl will do that for you):

  use APR::Socket ();
  
  # set the socket to the blocking mode if it isn't already
  use APR::Const -compile => qw(SO_NONBLOCK);
  if ($sock->opt_get(APR::Const::SO_NONBLOCK)) {
      $sock->opt_set(APR::Const::SO_NONBLOCK => 0);
  }
  # read from/write to the socket (w/o handling possible failures)
  my $wanted = 1024;
  while ($sock->recv(my $buffer, $wanted)) {
      $sock->send($buffer);
  }

If you want to handle errors by yourself, the loop may look like:

  use APR::Const -compile => qw(ECONNABORTED);
  # ...
  while (1) {
      my $buf;
      my $len = eval { $sock->recv($buf, $wanted) };
      if ($@) {
          # handle the error, e.g. to ignore aborted connections but
          # rethrow any other errors:
          if ($@ == APR::Const::ECONNABORTED) {
              # ignore
              last;
          }
          else {
              die $@; # retrow
          }
      }
  
      if ($len) {
          $sock->send($buffer);
      }
      else {
          last;
      }
  }