---
name: "sctp_send"
section: "3"
platform: "linux"
package: "lksctp-tools"
version: "1.0.21-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/sctp_send"
---

# sctp\_send(3)

Send a message from a SCTP socket.

## NAME

sctp\_send - Send a message from a SCTP socket.

## SYNOPSIS

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

int sctp_send(int sd, const void * msg, size_t len,
                 const struct sctp_sndrcvinfo *sinfo,
                 uint32_t flags);
```

## DESCRIPTION

**sctp\_send** is a wrapper library function that can be used to send a message from a socket without the use of the CMSG header structures. *sd* is the socket descriptor from which the message pointed to by *msg* of length *len* is sent. *sinfo* is a pointer to a sctp\_sndrcvinfo structure.   *flags* parameter is composed of a bitwise OR of the flags that can be be passed as the 3rd argument of a standard sendmsg() call.

## RETURN VALUE

On success, **sctp\_sendmsg** returns the number of bytes sent or -1 if an error occurred.

## SEE ALSO

[**sctp**(7)](/sctp/7.md) [**sctp\_bindx**(3)](/sctp_bindx/3.md), [**sctp\_recvmsg**(3)](/sctp_recvmsg/3.md), [**sctp\_recvv**(3)](/sctp_recvv/3.md), [**sctp\_peeloff**(3)](/sctp_peeloff/3.md), [**sctp\_getpaddrs**(3)](/sctp_getpaddrs/3.md), [**sctp\_getladdrs**(3)](/sctp_getladdrs/3.md), [**sctp\_opt\_info**(3)](/sctp_opt_info/3.md), [**sctp\_sendmsg**(3)](/sctp_sendmsg/3.md), [**sctp\_sendv**(3)](/sctp_sendv/3.md)