[Bug libc/16610] New: Inaccurate assumptions about recvmmsg availability

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16610

            Bug ID: 16610
           Summary: Inaccurate assumptions about recvmmsg availability
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
                CC: drepper.fsp at gmail dot com
              Host: *-*-linux*

Similar to bug 16609 about accept4, glibc wrongly assumes the recvmmsg syscall
is available for 2.6.33 and above even on architectures (powerpc and sh) where
the syscall was added later but the socketcall call is available from 2.6.33. 
(This is less serious than the accept4 case because nothing tests
__ASSUME_RECVMMSG to see if the recvmmsg function is available, so the only
effect that that the function fails to work on some kernels where it could
easily work using socketcall.)

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