On Wed, Aug 3, 2016 at 10:54 AM, Lundberg, Johannes <johan...@brilliantservice.co.jp> wrote: > Hi > > I'm porting a project to fbsd and I have problem with this part that works > in linux but not fbsd when fd = -1. > > https://github.com/Cloudef/wlc/blob/master/src/session/fd.c#L80-L108 > > I get "invalid argument" from sendmsg() when setting CMSG_LEN(0). > > Anyone have a clue how to correctly do this on fbsd? > > Thanks! > > Johannes >
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. -Alan _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
