kern/53272: recvmmsg() is not supported on NetBSD32

[roy%marples.name@localhost]

>Number:         53272
>Category:       kern
>Synopsis:       recvmmsg() is not supported on NetBSD32
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 08 16:30:00 +0000 2018
>Originator:     Roy Marplses
>Release:        NetBSD -current
>Organization:
>Environment:
# uname -a
NetBSD erlite.marples.name 8.99.16 NetBSD 8.99.16 (ERLITE) #8: Tue May  8 14:48:48 BST 2018  roy%netbsd.marples.name@localhost:/home/roy/obj/src-evbmips/sys/arch/evbmips/compile/ERLITE evbmips
>Description:
nsd worker processes die with status 12, which is SIGSYS
nsd starts a new worker process, which pegs the CPU constantly

ktracing the process, we see this:
 CALL  #475 (unimplemented { int | netbsd32 | | recvmmsg ( int s , struct mmsghdr * mmsg , unsigned int vlen , unsigned int flags , netbsd32_timespecp_t timeout ) ; })
>How-To-Repeat:
Setup nsd on ERLITE
Query it using dig
>Fix:
You can disable HAVE_RECVMMSG and HAVE_SENDMMSG in config.h to work around this.