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),