NAME

       sctp_sendv - Send messages from a SCTP socket with an extensible way.

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_sendv(int sd, const struct iovec * iov, int iovcnt,
                      struct sockaddr *addrs, int addrcnt, void * info,
                      socklen_t infolen, unsigned int infotype, int flags);

DESCRIPTION

       sctp_sendv  provides  an  extensible  way for an application to communicate different send
       attributes to the SCTP stack when sending a message. There are three types  of  attributes
       that  can  be  used to describe a message to be sent. They are struct sctp_sndinfo, struct
       sctp_prinfo, and struct sctp_authinfo. The following structure, sctp_sendv_spa, is defined
       to  be used when more than one of the above attributes are needed to describe a message to
       be sent.

          struct sctp_sendv_spa {
            uint32_t sendv_flags;
            struct sctp_sndinfo sendv_sndinfo;
            struct sctp_prinfo sendv_prinfo;
            struct sctp_authinfo sendv_authinfo;
          };

       The   sendv_flags   field    holds    a    bitwise    OR    of    SCTP_SEND_SNDINFO_VALID,
       SCTP_SEND_PRINFO_VALID,     and     SCTP_SEND_AUTHINFO_VALID     indicating     if     the
       sendv_sndinfo/sendv_prinfo/sendv_authinfo fields contain valid information.

       sd is the socket descriptor.  iov is the gather buffer,  the data in the buffer is treated
       as  a single user message.  iovcnt is the number of elements in iov.  addrs is an array of
       addresses to be used to set up an association or a single address to be used to  send  the
       message,  and   NULL is passed in if the caller neither wants to set up an association nor
       wants to send the message to a specific address.  addrcnt is the number  of  addresses  in
       the addrs array.  info is a pointer to the buffer containing the attribute associated with
       the message to be sent,  and the type is indicated by the info_type parameter.  infolen is
       the length of info, in bytes.  infotype identifies the type of the information provided in
       info ,and the current defined values are as follows:

       SCTP_SENDV_NOINFO
              No information is provided.  The parameter info is a NULL pointer, and  infolen  is
              0.

       SCTP_SENDV_SNDINFO
              The parameter info is pointing to a struct sctp_sndinfo.

       SCTP_SENDV_PRINFO
              The parameter info is pointing to a struct sctp_prinfo.

       SCTP_SENDV_AUTHINFO
              The parameter info is pointing to a struct sctp_authinfo.

       SCTP_SENDV_SPA
              The parameter info is pointing to a struct sctp_sendv_spa.

       flags The same flags as used by the sendmsg() call flags (e.g., MSG_DONTROUTE).

RETURN VALUE

       On success, sctp_sendv returns the number of bytes sent or -1 if an error occurred.

SEE ALSO

       sctp(7)  sctp_bindx(3),  sctp_connectx(3),  sctp_send(3),  sctp_recvmsg(3), sctp_recvv(3),
       sctp_peeloff(3), sctp_getpaddrs(3), sctp_getladdrs(3), sctp_opt_info(3),