On Wed, Aug 3, 2016 at 10:54 AM, Lundberg, Johannes
> I'm porting a project to fbsd and I have problem with this part that works
> in linux but not fbsd when fd = -1.
> I get "invalid argument" from sendmsg() when setting CMSG_LEN(0).
> Anyone have a clue how to correctly do this on fbsd?
It sounds like you're trying to send an empty cmsg. The error may
happen because your msg_controllen field is inconsistent with your
cmsg_len field. You're setting msg_controllen as if there were a full
cmsg, but then cmsg_len says that there is no cmsg. Or maybe the
error is because (just guessing) FreeBSD doesn't allow sending empty
or undefined cmsgs. Notice that cmsg_level and cmsg_type are
undefined in the case where fd == -1. POSIX doesn't say whether
sendmsg supports empty cmsgs, but why bother? You could just use send
instead of sendmsg if you're not sending a file descriptor.
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