sendto(2)                      DG/UX 5.4R3.00                      sendto(2)


NAME
       sendto - send a message from a socket

SYNOPSIS
       #include <sys/socket.h>

       int    sendto (s, msg, len, userflags, to, tolen)
       int    s;
       const void * msg;
       int    len;
       int    userflags;
       const struct sockaddr *to;
       int    tolen;

   where:
       s           File descriptor of socket to send message from
       msg         Message buffer
       len         Length of message (in bytes)
       userflags  Flags to use when sending
       to          Name of destination
       tolen       Length of destination name in bytes

DESCRIPTION
       This call sends a message, as does send.  However, sendto has
       arguments that specify the destination of the message.

       The address of the destination is given by the to argument with tolen
       specifying its size.  When used with a connected socket, the to and
       tolen arguments are ignored.  Other arguments are the same as for
       send.

ACCESS CONTROL
       None.

RETURN VALUE
       1..len    Completed successfully.  The call returns the number of
                 characters sent.

       -1        An error occurred.  errno is set to indicate the error.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EBADF     The argument s is not an active valid descriptor.

       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 made this impossible.

       EAGAIN    The socket is marked non-blocking and the requested



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sendto(2)                      DG/UX 5.4R3.00                      sendto(2)


                 operation would block.

       EISCONN   Can't sendto with connected socket.

       EINTR     The sendto() was interrupted by delivery of a signal before
                 any data was delivered.

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
















































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