[Bug 282495] Linuxulator sendfile returns EAGAIN repeatedly, actually repeatingly sending (the same) data

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282495

Mark Johnston <markj@FreeBSD.org> changed:

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                 CC|                            |markj@FreeBSD.org

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
On main I compiled your program with:

$ env GOOS=linux go build main.go
$ brandelf -t Linux main

then ran it with some dummy data:

$ date > file2
$ ./main &
$ nc -v localhost 4040 > testfile
Entering loop, remain = 29
syscall returned n=29, err=%!s(<nil>)
Sendfile syscall success, written: 29, remain: 0
Wrote 29 bytes, handled: %!s(bool=true)Connection to localhost 4040 port
[tcp/*] succeeded!
$ cat testfile
Mon Nov  4 13:54:57 EST 2024
$

So something is different.  Maybe something to do with the size of "file2"?  Or
the problem is in 14.1 but not FreeBSD-main.  Or I don't quite understand the
expected behaviour.

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