apr::socket.3

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.\" ========================================================================
.\"
.IX Title "mod_perl-2.0.2::docs::api::APR::Socket 3"
.TH mod_perl-2.0.2::docs::api::APR::Socket 3 "2005-10-21" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
APR::Socket \- Perl API for APR sockets
.SH "Synopsis"
.IX Header "Synopsis"
.Vb 1
\&  use APR::Socket ();
\&  
\&  ### set the socket to the blocking mode if it isn\*(Aqt 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\en";
\&      # 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
\&  }
.Ve
.SH "Description"
.IX Header "Description"
\&\f(CW\*(C`APR::Socket\*(C'\fR provides the Perl interface to \s-1APR\s0 sockets.
.SH "API"
.IX Header "API"
\&\f(CW\*(C`APR::Socket\*(C'\fR provides the following methods:
.ie n .Sh """opt_get"""
.el .Sh "\f(CWopt_get\fP"
.IX Subsection "opt_get"
Query socket options for the specified socket
.PP
.Vb 1
\&  $val = $sock\->opt_get($opt);
.Ve
.ie n .IP "obj: $sock\fR ( \f(CW""APR::Socket object"" )" 4
.el .IP "obj: \f(CW$sock\fR ( \f(CWAPR::Socket object\fR )" 4
.IX Item "obj: $sock ( APR::Socket object )"
the socket object to query
.ie n .IP "arg1: $opt\fR ( \f(CW""APR::Const constant"" )" 4
.el .IP "arg1: \f(CW$opt\fR ( \f(CWAPR::Const constant\fR )" 4
.IX Item "arg1: $opt ( APR::Const constant )"
the socket option we would like to configure.  Here are the
available socket options.
.ie n .IP "ret: $val ( integer )" 4
.el .IP "ret: \f(CW$val\fR ( integer )" 4
.IX Item "ret: $val ( integer )"
the currently set value for the socket
option you've queried for
.ie n .IP "excpt: ""APR::Error""" 4
.el .IP "excpt: \f(CWAPR::Error\fR" 4
.IX Item "excpt: APR::Error"
.PD 0
.IP "since: 2.0.00" 4
.IX Item "since: 2.0.00"
.PD
.PP
Examples can be found in the socket options constants
section. For example setting 
the \s-1IO\s0 to the blocking
mode.
.ie n .Sh """opt_set"""
.el .Sh "\f(CWopt_set\fP"
.IX Subsection "opt_set"
Setup socket options for the specified socket
.PP
.Vb 1
\&  $sock\->opt_set($opt, $val);
.Ve
.ie n .IP "obj: $sock\fR ( \f(CW""APR::Socket object"" object )" 4
.el .IP "obj: \f(CW$sock\fR ( \f(CWAPR::Socket object\fR object )" 4
.IX Item "obj: $sock ( APR::Socket object object )"
the socket object to set up.
.ie n .IP "arg1: $opt\fR ( \f(CW""APR::Const"" constant )" 4
.el .IP "arg1: \f(CW$opt\fR ( \f(CWAPR::Const\fR constant )" 4
.IX Item "arg1: $opt ( APR::Const constant )"
the socket option we would like to configure.  Here are the
available socket options.
.ie n .IP "arg2: $val ( integer )" 4
.el .IP "arg2: \f(CW$val\fR ( integer )" 4
.IX Item "arg2: $val ( integer )"
value for the option. Refer to the socket
options section to learn about
the expected values.
.IP "ret: no return value" 4
.IX Item "ret: no return value"
.PD 0
.ie n .IP "excpt: ""APR::Error""" 4
.el .IP "excpt: \f(CWAPR::Error\fR" 4
.IX Item "excpt: APR::Error"
.IP "since: 2.0.00" 4
.IX Item "since: 2.0.00"
.PD
.PP
Examples can be found in the socket options constants
section. For example setting 
the \s-1IO\s0 to the blocking
mode.
.ie n .Sh """poll"""
.el .Sh "\f(CWpoll\fP"
.IX Subsection "poll"
Poll the socket for events:
.PP
.Vb 1
\&    $rc = $sock\->poll($pool, $timeout, $events);
.Ve
.ie n .IP "obj: $sock\fR ( \f(CW""APR::Socket object"" )" 4
.el .IP "obj: \f(CW$sock\fR ( \f(CWAPR::Socket object\fR )" 4
.IX Item "obj: $sock ( APR::Socket object )"
The socket to poll
.ie n .IP "arg1: $pool\fR ( \f(CW""APR::Pool object"" )" 4
.el .IP "arg1: \f(CW$pool\fR ( \f(CWAPR::Pool object\fR )" 4
.IX Item "arg1: $pool ( APR::Pool object )"
usually \f(CW\*(C`$c\->pool\*(C'\fR.
.ie n .IP "arg2: $timeout ( integer )" 4
.el .IP "arg2: \f(CW$timeout\fR ( integer )" 4
.IX Item "arg2: $timeout ( integer )"
The amount of time to wait (in milliseconds) for the specified events
to occur.
.ie n .IP "arg3: $events\fR ( \f(CW""APR::Const :poll constants"" )" 4
.el .IP "arg3: \f(CW$events\fR ( \f(CWAPR::Const :poll constants\fR )" 4
.IX Item "arg3: $events ( APR::Const :poll constants )"
The events for which to wait.
.Sp
For example use
\&\f(CW\*(C`APR::Const::POLLIN\*(C'\fR to wait
for incoming data to be available,
\&\f(CW\*(C`APR::Const::POLLOUT\*(C'\fR to wait
until it's possible to write data to the socket and
\&\f(CW\*(C`APR::Const::POLLPRI\*(C'\fR to wait
for priority data to become available.
.ie n .IP "ret: $rc\fR ( \f(CW""APR::Const constant"" )" 4
.el .IP "ret: \f(CW$rc\fR ( \f(CWAPR::Const constant\fR )" 4
.IX Item "ret: $rc ( APR::Const constant )"
If \f(CW\*(C`APR::Const::SUCCESS\*(C'\fR 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
\&\f(CW\*(C`APR::Error::strerror\*(C'\fR.
.IP "since: 2.0.00" 4
.IX Item "since: 2.0.00"
.PP
For example poll a non-blocking socket up to 1 second when reading
data from the client:
.PP
.Vb 3
\&  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);
\&  }
.Ve
.ie n .Sh """recv"""
.el .Sh "\f(CWrecv\fP"
.IX Subsection "recv"
Read incoming data from the socket
.PP
.Vb 1
\&  $len = $sock\->recv($buffer, $wanted);
.Ve
.ie n .IP "obj: $sock\fR ( \f(CW""APR::SockAddr object"" object )" 4
.el .IP "obj: \f(CW$sock\fR ( \f(CWAPR::SockAddr object\fR object )" 4
.IX Item "obj: $sock ( APR::SockAddr object object )"
The socket to read from
.ie n .IP "arg1: $buffer ( \s-1SCALAR\s0 )" 4
.el .IP "arg1: \f(CW$buffer\fR ( \s-1SCALAR\s0 )" 4
.IX Item "arg1: $buffer ( SCALAR )"
The buffer to fill. All previous data will be lost.
.ie n .IP "arg2: $wanted ( int )" 4
.el .IP "arg2: \f(CW$wanted\fR ( int )" 4
.IX Item "arg2: $wanted ( int )"
How many bytes to attempt to read.
.ie n .IP "ret: $len ( number )" 4
.el .IP "ret: \f(CW$len\fR ( number )" 4
.IX Item "ret: $len ( number )"
How many bytes were actually read.
.Sp
\&\f(CW$buffer\fR gets populated with the string that is read. It will
contain an empty string if there was nothing to read.
.ie n .IP "excpt: ""APR::Error""" 4
.el .IP "excpt: \f(CWAPR::Error\fR" 4
.IX Item "excpt: APR::Error"
If you get the \f(CW\*(Aq(11) Resource temporarily unavailable\*(Aq\fR error
(exception
\&\f(CW\*(C`APR::Const::EAGAIN\*(C'\fR)
(or another equivalent, which might be different on non-POSIX
systems), then you didn't ensure that the socket is in a blocking \s-1IO\s0
mode before using it. Note that you should use 
\&\f(CW\*(C`APR::Status::is_EAGAIN\*(C'\fR
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:
.Sp
.Vb 10
\&  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;