Send a message from a sctp socket.
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/sctp.h>
int sctp_sendmsg(int sd, const void * msg, size_t len,
struct sockaddr *to, socklen_t tolen,
uint32_t ppid, uint32_t flags,
uint16_t stream_no, uint32_t timetolive,
uint32_t context);
sctp_sendmsg is a wrapper library function that can be used to send a message from a socket while using the advanced features of SCTP. sd is the socket descriptor from which the message pointed to by msg of length len is sent. to is the destination address of the message and tolen is the length of the destination address. stream_no identifies the stream number that the application wishes to send this message to. flags parameter is composed of a bitwise OR of the following values.
SCTP_UNORDERED
This flags requests the un-ordered delivery of the message.
SCTP_ADDR_OVER
This flag, in the one-to-many style, requests the SCTP stack to override the primary destination address with address specified in to.
SCTP_ABORT
Setting this flag causes the specified association to abort by sending an ABORT message to the peer(one-to-many style only). The ABORT chunk will contain an error cause 'User Initiated Abort' with cause code 12. The cause specific information of this error cause is provided in msg.
SCTP_EOF
Setting this flag invokes the SCTP graceful shutdown procedure on the specific association(one-to-many style only).
timetolive specifies the time duration in milliseconds. The sending side will expire the message if the message has not been sent to the peer within this time period. A value of 0 indicates that no timeout should occur on this message. ppid is an opaque unsigned value that is passed to the remote end along with the message. context is a 32 bit opaque value that is passed back to the upper layer along with the undelivered message if an error occurs on the send of the message.
On success, sctp_sendmsg returns the number of bytes sent or -1 if an error occurred.