This is the low-level system call used to implement
mq_getattr(3)
and
mq_setattr(3).
For an explanation of how this system call operates,
see the description of
mq_setattr(3).
CONFORMING TO
This interface is non-standard; avoid its use.
NOTES
Glibc does not provide a wrapper for this system call; call it using
syscall(2).
(Actually, never call it unless you are writing a libc!)