---
name: "sctp_opt_info"
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_opt_info"
---

# sctp\_opt\_info(3)

Get options on a SCTP socket.

## NAME

sctp\_optinfo - Get options on a SCTP socket.

## SYNOPSIS

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

int sctp_opt_info(int sd, sctp_assoc_t id, int opt,
                  void * arg, socklen_t * size);
```

## DESCRIPTION

**sctp\_opt\_info** is a wrapper library function that can be used to get SCTP level options on a socket. *sd* is the socket descriptor for which the option is requested. For one-to-many style sockets, *id* specifies the association to query. For one-to-one style sockets, *id* is ignored. *opt* specifes the SCTP socket option to get. *arg* is an option-specific structure buffer provided by the caller.  *size* is a value-result parameter, initially containing the size of the buffer pointed to by *arg* and modifed on return to indicate the actual size of the value returned.

## RETURN VALUE

On success, **sctp\_opt\_info** returns 0 and on failure -1 is returned with errno set to the appropriate error code.

## SEE ALSO

[**sctp**(7)](/sctp/7.md) [**sctp\_bindx**(3)](/sctp_bindx/3.md), [**sctp\_connectx**(3)](/sctp_connectx/3.md), [**sctp\_sendmsg**(3)](/sctp_sendmsg/3.md), [**sctp\_sendv**(3)](/sctp_sendv/3.md), [**sctp\_send**(3)](/sctp_send/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),