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connect(p1) public

Requests a connection to be made on the given server_sockaddr. Returns 0 if successful, otherwise an exception is raised.

Parameter

  • server_sockaddr - the struct sockaddr contained in a string

Example:

     # Pull down Google's web page
     require 'socket'
     include Socket::Constants
     socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
     sockaddr = Socket.pack_sockaddr_in( 80, 'www.google.com' )
     socket.connect( sockaddr )
     socket.write( "GET / HTTP/1.0\r\n\r\n" )
     results = socket.read

Unix-based Exceptions

On unix-based systems the following system exceptions may be raised if the call to connect fails:

  • Errno::EACCES - search permission is denied for a component of the prefix path or write access to the socket is denided
  • Errno::EADDRINUSE - the sockaddr is already in use
  • Errno::EADDRNOTAVAIL - the specified sockaddr is not available from the local machine
  • Errno::EAFNOSUPPORT - the specified sockaddr is not a valid address for the address family of the specified socket
  • Errno::EALREADY - a connection is already in progress for the specified socket
  • Errno::EBADF - the socket is not a valid file descriptor
  • Errno::ECONNREFUSED - the target sockaddr was not listening for connections refused the connection request
  • Errno::ECONNRESET - the remote host reset the connection request
  • Errno::EFAULT - the sockaddr cannot be accessed
  • Errno::EHOSTUNREACH - the destination host cannot be reached (probably because the host is down or a remote router cannot reach it)
  • Errno::EINPROGRESS - the O_NONBLOCK is set for the socket and the connection cnanot be immediately established; the connection will be established asynchronously
  • Errno::EINTR - the attempt to establish the connection was interrupted by delivery of a signal that was caught; the connection will be established asynchronously
  • Errno::EISCONN - the specified socket is already connected
  • Errno::EINVAL - the address length used for the sockaddr is not a valid length for the address family or there is an invalid family in sockaddr
  • Errno::ENAMETOOLONG - the pathname resolved had a length which exceeded PATH_MAX
  • Errno::ENETDOWN - the local interface used to reach the destination is down
  • Errno::ENETUNREACH - no route to the network is present
  • Errno::ENOBUFS - no buffer space is available
  • Errno::ENOSR - there were insufficient STREAMS resources available to complete the operation
  • Errno::ENOTSOCK - the socket argument does not refer to a socket
  • Errno::EOPNOTSUPP - the calling socket is listening and cannot be connected
  • Errno::EPROTOTYPE - the sockaddr has a different type than the socket bound to the specified peer address
  • Errno::ETIMEDOUT - the attempt to connect time out before a connection was made.

On unix-based systems if the address family of the calling socket is AF_UNIX the follow exceptions may be raised if the call to connect fails:

  • Errno::EIO - an i/o error occured while reading from or writing to the file system
  • Errno::ELOOP - too many symbolic links were encountered in translating the pathname in sockaddr
  • Errno::ENAMETOOLLONG - a component of a pathname exceeded NAME_MAX characters, or an entired pathname exceeded PATH_MAX characters
  • Errno::ENOENT - a component of the pathname does not name an existing file or the pathname is an empty string
  • Errno::ENOTDIR - a component of the path prefix of the pathname in sockaddr is not a directory

Windows Exceptions

On Windows systems the following system exceptions may be raised if the call to connect fails:

  • Errno::ENETDOWN - the network is down
  • Errno::EADDRINUSE - the socket’s local address is already in use
  • Errno::EINTR - the socket was cancelled
  • Errno::EINPROGRESS - a blocking socket is in progress or the service provider is still processing a callback function. Or a nonblocking connect call is in progress on the socket.
  • Errno::EALREADY - see Errno::EINVAL
  • Errno::EADDRNOTAVAIL - the remote address is not a valid address, such as ADDR_ANY TODO check ADDRANY TO INADDR_ANY
  • Errno::EAFNOSUPPORT - addresses in the specified family cannot be used with with this socket
  • Errno::ECONNREFUSED - the target sockaddr was not listening for connections refused the connection request
  • Errno::EFAULT - the socket’s internal address or address length parameter is too small or is not a valid part of the user space address
  • Errno::EINVAL - the socket is a listening socket
  • Errno::EISCONN - the socket is already connected
  • Errno::ENETUNREACH - the network cannot be reached from this host at this time
  • Errno::EHOSTUNREACH - no route to the network is present
  • Errno::ENOBUFS - no buffer space is available
  • Errno::ENOTSOCK - the socket argument does not refer to a socket
  • Errno::ETIMEDOUT - the attempt to connect time out before a connection was made.
  • Errno::EWOULDBLOCK - the socket is marked as nonblocking and the connection cannot be completed immediately
  • Errno::EACCES - the attempt to connect the datagram socket to the broadcast address failed

See

  • connect manual pages on unix-based systems
  • connect function in Microsoft’s Winsock functions reference
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