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Date:      Wed, 21 Jun 2023 05:24:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 272124] The socket option "SCTP_DELAYED_ACK_TIME" is not available
Message-ID:  <bug-272124-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272124

            Bug ID: 272124
           Summary: The socket option "SCTP_DELAYED_ACK_TIME" is not
                    available
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs@FreeBSD.org
          Reporter: ph317093@fh-muenster.de
                CC: doc@FreeBSD.org

The socket option "SCTP_DELAYED_ACK_TIME" is not available on
FreeBSD-14.0-CURRENT-amd64-20230615, even though it is mentioned in the manual.
Instead, you can use SCTP_DELAYED_SACK. I believe this is an error in the
manual and needs to be replaced.


Here's an example of the error:

struct sctp_sack_info sackInfo;
socklen_t sackInfo_len = (socklen_t) sizeof(sackInfo);

memset(&sackInfo, 0, sackInfo_len);
sackInfo.sack_assoc_id = sackAssocId;
sackInfo.sack_delay = sackDelay;
sackInfo.sack_freq = sackFreq;

if (setsockopt(fd,
           IPPROTO_SCTP,
           SCTP_DELAYED_ACK_TIME,
           &sackInfo,
           sackInfo_len) == -1) {

    perror("SCTP_DELAYED_ACK_TIME");
    exit(EXIT_FAILURE);
}

error: use of undeclared identifier 'SCTP_DELAYED_ACK_TIME'
                                     ^

Instead, the following approach works:

if (setsockopt(fd,
           IPPROTO_SCTP,
           SCTP_DELAYED_SACK,
           &sackInfo,
           sackInfo_len) == -1) {

    perror("SCTP_DELAYED_SACK");
    exit(EXIT_FAILURE);
}

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