- send message from an SCTP socket
cc [ flag... ] file... -lsocket -lnsl -lsctp [ library... ] #include <sys/types.h> #include <sys/socket.h> #include <netinet/sctp.h> ssize_t sctp_sendmsg(int s, const void *msg, size_t len, const struct sockaddr *to, socklen_t tolen, uint32_t ppid, uint32_t flags, uint16_t stream_no, uint32_t timetolive, uint32_t context);
The sctp_sendmsg() function sends a message from the SCTP endpoint s.
In addition to specifying msg as the message buffer and len as the length of the buffer, the following parameters can be set:
Length of the destination address
Application-specified payload protocol identifier
Target stream for the message
Time period in milliseconds after which the message expires if transmission for the message has not been started. A value of 0 indicates that the message does not expire. When the MSG_PR_SCTP flag is set the message expires, even if transmission has started, unless the entire message is transmitted within the timetolive period.
Value returned when an error occurs in sending a message
The flags parameter is formed from the bitwise OR of zero or more of the following flags:
This flag requests un-ordered delivery of the message. If this flag is clear the message is considered an ordered send.
When set, this flag causes the specified association to abort by sending an ABORT to the peer. The flag is used only for one-to-many style SCTP socket associations.
When set, this flag invokes a graceful shutdown on a specified association. The flag is used only for one-to-many style SCTP socket associations.
This flag indicates that the message is treated as partially reliable. The message expires unless the entire message is successfully transmitted within the time period specified in the timetolive parameter.
MSG_PR_SCTP implements timed reliability service for SCTP messages. As yet, no common standard has been defined for the service and the interface is considered unstable.
The initial call to sctp_sendmsg() can be used to create an association, but it cannot be used subsequently on an existing association. Since sctp_sendmsg() always uses 0 internally as the association ID, it is not suitable for use on one-to-many sockets.
Upon successful completion, the sctp_sendmsg() function returns the number of bytes sent. The function returns -1 if an error occurs.
The sctp_sendmsg() function will fail if:
The s argument is an invalid file descriptor.
The s argument is not a socket.
MSG_OOB is set as a flag.
MSG_ABORT or MSG_EOF is set on a one-to-one style SCTP socket.
The socket is shutting down and no more writes are allowed.
The socket is non-blocking and the transmit queue is full.
There is no established association.
Control message length is incorrect.
Specified destination address does not belong to the association.
Address family of the specified destination address is other than AF_INET or AF_INET6.
See attributes(5) for descriptions of the following attributes: