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recvfrom-i.yaml

--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
 body: Receives up to maxlen bytes from <tt>socket</tt>. flags is zero or more of the <tt>MSG_</tt> options. The first element of the results, mesg, is the data received. The second element, sender_sockaddr, contains protocol-specific information on the sender.
- !ruby/struct:SM::Flow::H 
 level: 3
 text: Parameters
- !ruby/object:SM::Flow::LIST 
 contents: 
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: <tt>maxlen</tt> - the number of bytes to receive from the socket
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: <tt>flags</tt> - zero or more of the <tt>MSG_</tt> options
 type: :BULLET
- !ruby/struct:SM::Flow::H 
 level: 3
 text: Example
- !ruby/struct:SM::Flow::VERB 
 body: " # In one file, start this first\n require 'socket'\n include Socket::Constants\n socket = Socket.new( AF_INET, SOCK_STREAM, 0 )\n sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )\n socket.bind( sockaddr )\n socket.listen( 5 )\n client, client_sockaddr = socket.accept\n data = client.recvfrom( 20 )[0].chomp\n puts &quot;I only received 20 bytes '#{data}'&quot;\n sleep 1\n socket.close\n\n # In another file, start this second\n require 'socket'\n include Socket::Constants\n socket = Socket.new( AF_INET, SOCK_STREAM, 0 )\n sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )\n socket.connect( sockaddr )\n socket.puts &quot;Watch this get cut short!&quot;\n socket.close\n"
- !ruby/struct:SM::Flow::H 
 level: 3
 text: Unix-based Exceptions
- !ruby/struct:SM::Flow::P 
 body: "On unix-based based systems the following system exceptions may be raised if the call to recvfrom fails:"
- !ruby/object:SM::Flow::LIST 
 contents: 
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EAGAIN - the <tt>socket</tt> file descriptor is marked as O_NONBLOCK and no data is waiting to be received; or MSG_OOB is set and no out-of-band data is available and either the <tt>socket</tt> file descriptor is marked as O_NONBLOCK or the <tt>socket</tt> does not support blocking to wait for out-of-band-data
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EWOULDBLOCK - see Errno::EAGAIN
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EBADF - the <tt>socket</tt> is not a valid file descriptor
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ECONNRESET - a connection was forcibly closed by a peer
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EFAULT - the socket's internal buffer, address or address length cannot be accessed or written
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EINTR - a signal interupted recvfrom before any data was available
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EINVAL - the MSG_OOB flag is set and no out-of-band data is available
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EIO - an i/o error occurred while reading from or writing to the filesystem
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENOBUFS - insufficient resources were available in the system to perform the operation
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENOMEM - insufficient memory was available to fulfill the request
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENOSR - there were insufficient STREAMS resources available to complete the operation
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENOTCONN - a receive is attempted on a connection-mode socket that is not connected
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENOTSOCK - the <tt>socket</tt> does not refer to a socket
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EOPNOTSUPP - the specified flags are not supported for this socket type
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ETIMEDOUT - the connection timed out during connection establishment or due to a transmission timeout on an active connection
 type: :BULLET
- !ruby/struct:SM::Flow::H 
 level: 3
 text: Windows Exceptions
- !ruby/struct:SM::Flow::P 
 body: "On Windows systems the following system exceptions may be raised if the call to recvfrom fails:"
- !ruby/object:SM::Flow::LIST 
 contents: 
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENETDOWN - the network is down
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EFAULT - the internal buffer and from parameters on <tt>socket</tt> are not part of the user address space, or the internal fromlen parameter is too small to accomodate the peer address
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EINTR - the (blocking) call was cancelled by an internal call to the WinSock function WSACancelBlockingCall
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EINPROGRESS - a blocking Windows Sockets 1.1 call is in progress or the service provider is still processing a callback function
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EINVAL - <tt>socket</tt> has not been bound with a call to bind, or an unknown flag was specified, or MSG_OOB was specified for a socket with SO_OOBINLINE enabled, or (for byte stream-style sockets only) the internal len parameter on <tt>socket</tt> was zero or negative
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EISCONN - <tt>socket</tt> is already connected. The call to recvfrom is not permitted with a connected socket on a socket that is connetion oriented or connectionless.
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ENETRESET - the connection has been broken due to the keep-alive activity detecting a failure while the operation was in progress.
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EOPNOTSUPP - MSG_OOB was specified, but <tt>socket</tt> is not stream-style such as type SOCK_STREAM. OOB data is not supported in the communication domain associated with <tt>socket</tt>, or <tt>socket</tt> is unidirectional and supports only send operations
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ESHUTDOWN - <tt>socket</tt> has been shutdown. It is not possible to call recvfrom on a socket after shutdown has been invoked.
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EWOULDBLOCK - <tt>socket</tt> is marked as nonblocking and a call to recvfrom would block.
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::EMSGSIZE - the message was too large to fit into the specified buffer and was truncated.
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ETIMEDOUT - the connection has been dropped, because of a network failure or because the system on the other end went down without notice
 - !ruby/struct:SM::Flow::LI 
 label: "*"
 body: Errno::ECONNRESET - the virtual circuit was reset by the remote side executing a hard or abortive close. The application should close the socket; it is no longer usable. On a UDP-datagram socket this error indicates a previous send operation resulted in an ICMP Port Unreachable message.
 type: :BULLET
full_name: Socket#recvfrom
is_singleton: false
name: recvfrom
params: |
 socket.recvfrom(maxlen) => [mesg, sender_sockaddr]
 socket.recvfrom(maxlen, flags) => [mesg, sender_sockaddr]

visibility: public

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