send(2N)                                                 send(2N)



     NAME
          send, sendto, sendmsg - send a message from a socket

     SYNOPSIS
          #include <sys/types.h>
          #include <sys/socket.h>

          cc = send(s, msg, len, flags)
          int cc, s;
          char *msg;
          int len, flags;

          cc = sendto(s, msg, len, flags, to, tolen)
          int cc, s;
          char *msg;
          int len, flags;
          struct sockaddr *to;
          int tolen;

          cc = sendmsg(s, msg, flags)
          int cc, s;
          struct msghdr msg[];
          int flags;

          cc ... -lnet

     DESCRIPTION
          send, sendto, and sendmsg are used to transmit a message to
          another socket.  send may be used only when the socket is in
          a connected state, while sendto and sendmsg may be used at
          any time.

          The address of the target is given by to with tolen
          specifying its size.  The length of the message is given by
          len.  If the message is too long to pass atomically through
          the underlying protocol, then the error EMSGSIZE is
          returned, and the message is not transmitted.

          No indication of failure to deliver is implicit in a send.
          Return values of -1 indicate some locally detected errors.

          If no messages space is available at the socket to hold the
          message to be transmitted, then send normally blocks, unless
          the socket has been placed in non-blocking I/O mode.  The
          select(2N) call may be used to determine when it is possible
          to send more data.

          The flags parameter may be set to MSGOOB to send ``out-of-
          band'' data on sockets which support this notion (e.g.
          SOCKSTREAM).

          See recv(2N) for a description of the msghdr structure.



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     send(2N)                                                 send(2N)



     RETURN VALUE
          The call returns the number of characters sent, or -1 if an
          error occurred.

     ERRORS
          [EBADF]             An invalid descriptor was specified.

          [ENOTSOCK]          The argument s is not a socket.

          [EFAULT]            An invalid user space address was
                              specified for a parameter.

          [EMSGSIZE]          The socket requires that message be sent
                              atomically, and the size of the message
                              to be sent made this impossible.

          [EWOULDBLOCK]       The socket is marked non-blocking and
                              the requested operation would block.

     LINKING
          This library is accessed by specifying -lnet as the last
          argument to the compile line, e.g.:

            cc -o prog prog.c -lnet

     SEE ALSO
          recv(2N), socket(2N).




























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