asymmetry with MSG_DONTWAIT in sendmsg() and recvmsg()

[Chris Friesen <cfriesen@xxxxxxxxxxxxxxxxxx>]

I have a SOCK_STREAM PF_UNIX socket with no special options enabled using 
fcntl().

The default with sendmsg() and recvmsg() is to block.

With sndmsg(), I can use the MSG_DONTWAIT flag to enable non-blocking operation 
for that one call.
How do I do the equivalent for recvmsg()?

Thanks,

Chris