Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Copy head to stable/9 as part of 9.0-RELEASE release cycle.Approved by: re (implicit)
Add function __mq_oshandle() to get file handle of a mqueue.
Fix compiling for c++, include cdefs.h.
Bring in POSIX message queue header file.