Invoking sendmmsg from Go.

Invoking sendmmsg from Go.

[john]

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Hey folks;

While reading through some of the wireguard-go source I saw there is a 
TODO to implement:

         // 
https://git.zx2c4.com/wireguard-go/tree/tun/tun_linux.go?id=3957e9b9dd19#n359
         func (tun *NativeTun) Flush() error

The note suggests using sendmmsg, which, does not seem to be implemented 
by the syscall package in Go. (https://github.com/golang/go/issues/9402)

Given that, I was wondering if anybody knows a way to interface with 
sendmmsg from Go?

-- 
Regards,

John S


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Re: Invoking sendmmsg from Go.

[Wade Simmons]

On Wed, Sep 1, 2021 at 9:59 AM john@sys.casa <john@sys.casa> wrote:
> Given that, I was wondering if anybody knows a way to interface with
> sendmmsg from Go?

As an example, the golang.org/x/net/ipv4 package implements WriteBatch
using sendmmsg:

- https://pkg.go.dev/golang.org/x/net/ipv4#PacketConn.WriteBatch

You can either use that method, or peek at the source code to see how
the syscall is called.

-- 
Wade Simmons