shmat on non-NULL address?

Mark K. Gardner (mkg@asimov.lanl.gov)
Thu, 17 Feb 2000 15:02:03 -0700

According to the man page for shmat, supplying a non-NULL shmaddr
(with or without asserting SHM_RND) should attach a shared memory
segment to the address. However, the shmat call always fails unless
supplied with a NULL shmaddr. I quickly perused the sys_shmat function
in linux/ipc/shm.c (RedHat 6.1, kernel 2.2.5) and could not tell if
non-NULL behavior is even implemented. Would someone who is more
knowledgeable about shared memory than I tell me if it is possible to
attach an existing address to shared memory? Thanks.

Mark

-- 
Mark K. Gardner
RADIANT Team
Network Engineering, CIC-5
Los Alamos National Laboratory
P.O. Box 1663, M.S. D451
Los Alamos, NM 87545
Email: mkg@lanl.gov
Phone: 1-505-665-4953

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