Eric Wong <e...@80x24.org> wrote: > sendmsg with MSG_EOR on a SOCK_SEQPACKET socket appears to cause the > receiving end to get truncated output (and MSG_TRUNC set). I'm only > sending a 153-byte record, so unlikely a problem with system limits. > This behavior does not exhibit on FreeBSD nor Linux, and I didn't see > where MSG_EOR could result in a truncated message in any man pages; > especially when I'm using AF_UNIX SOCK_SEQPACKET. > Using flags=0 with sendmsg appears to work fine, so perhaps I'm > misunderstanding MSG_EOR entirely. Or it's both a misunderstanding > on my part AND also a bug in OpenBSD.
Fwiw, I've stopped using MSG_EOR in most of my AF_UNIX SOCK_SEQPACKET-using code (which mainly runs on Linux and FreeBSD) and it's been working fine. In any case, I believe truncation observed when using MSG_EOR remains a bug in OpenBSD. I've also tried this in NetBSD 9.3 amd64 and it's behavior matches FreeBSD and Linux (no truncation) Thanks.
