Fails to compile on FreeBSD 14: missing function getSendQueueLen

[hxw]

Quick Fix

There is a sockio_unix.go which shows support for many OSs, but it references a getSendQueueLen function.
Currently this function is only defined for Linux (in sockio_linux.go). A quick fix for FreeBSD is to:

cp sockio_linux.go sockio_bsd.go

Next patch the sockio_bsd.go with the following diff:

--- sockio_linux.go	2024-03-28 14:42:39.901422000 +0800
+++ sockio_freebsd.go	2023-04-13 11:42:33.888702000 +0800
@@ -18,14 +18,13 @@
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

-//go:build linux
-// +build linux
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd || solaris
+// +build aix || darwin || dragonfly || freebsd || netbsd || openbsd || solaris

package tchannel

import "golang.org/x/sys/unix"

func getSendQueueLen(fd uintptr) (int, error) {
-	// https://linux.die.net/man/7/tcp
-	return unix.IoctlGetInt(int(fd), unix.SIOCOUTQ)
+	return unix.IoctlGetInt(int(fd), unix.TIOCOUTQ)
}

Better Alternative (perhaps)

Alternatively the function using unix.TIOCOUTQ could just be added to sockio_unix.go and the sockio_linux.go removed. From inspection of the files in go120/src/cmd/vendor/golang.org/x/sys/unix/ - All the OSs supported by sockio_unix.go have the TIOCOUTQ IOCTL and in the various Linux files this has exactly the same as the SIOCOUTQ value.

[moonetic]

The fix adds a compile issue on MacOS, because of multiple declarations of getSendQueueLen for darwin(in sockio_bsd and sockio_darwin). I opened another PR with a fix by removing darwin tag from sockio_bsd.
Here's the PR: #926

@ibarrajo, can you please assign a reviewer to this PR too?