Re: RFR: 8393721: Reduce max SO_LINGER value for BSD [v4]

[Volkan Yazici]

On Thu, 8 Oct 2026 13:57:32 GMT, Harald Eilertsen <haral...@openjdk.org> wrote:

>> The BSD's, like macOS store the SO_LINGER value in a signed short 
>> internally, so we need to clamp the value to 32767 for all the BSD's, not 
>> only macOS.
>> 
>> This work is sponsored by The FreeBSD Foundation
>> 
>> ---------
>> - [x] I confirm that I make this contribution in accordance with the 
>> [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
>
> Harald Eilertsen has updated the pull request incrementally with one 
> additional commit since the last revision:
> 
>   Remove unnecessary ignore

Changes LGTM.

1. I've downloaded a [FreeBSD 15.1 VM image], and started a VM with that.
2. Created the following simple reproducer, `LingerRepro.java`:
    ```
    import java.net.InetAddress;
    import java.net.ServerSocket;
    import java.net.Socket;
    
    import static java.net.StandardSocketOptions.SO_LINGER;
    
    public final class LingerRepro {
        public static void main(String[] args) throws Exception {
            try (var server = new ServerSocket(0, 1, 
InetAddress.getLoopbackAddress());
                 var client = new Socket(server.getInetAddress(), 
server.getLocalPort());
                 var accepted = server.accept()) {
                try {
                    var expected = 32809;
                    accepted.setSoLinger(true, expected);
                    var actual = accepted.getSoLinger();
                    System.out.printf(
                            "setSoLinger(%s); getSoLinger(): %s (%s)%n",
                            expected, actual,
                            actual == 32767 ? "OK" : "BAD");
                    accepted.setOption(SO_LINGER, expected);
                    actual = accepted.getOption(SO_LINGER);
                    System.out.printf(
                            "setOption(SO_LINGER, %s); getOption(SO_LINGER): %s 
(%s)%n",
                            expected, actual,
                            actual == 32767 ? "OK" : "BAD");
                } finally {
                    accepted.setSoLinger(false, 0);
                }
            }
        }
    }
    ```
3. Did `pkg install openjdk27` and run `LingerRepro`:
    ```
    setSoLinger(32809); getSoLinger(): 32767 (OK)
    setOption(SO_LINGER, 32809); getOption(SO_LINGER): -32727 (BAD)
    ```
4. Downloaded `/usr/ports`, manually patched `/usr/ports/java/openjdk27` with 
the `net_util_md.c` fix, build the JDK image, and re-run `LingerRepro`:
    ```
    setSoLinger(32809); getSoLinger(): 32767 (OK)
    setOption(SO_LINGER, 32809); getOption(SO_LINGER): 32767 (OK)
    ```

[FreeBSD 15.1 VM image]: 
https://download.freebsd.org/releases/VM-IMAGES/15.1-RELEASE/

-------------

Marked as reviewed by vyazici (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/33248#pullrequestreview-5469641271