Date: Wed, 18 Dec 1996 12:18:38 +0000 From: James Mansion <james@wgold.demon.co.uk> To: hackers@freebsd.org Subject: mmap pain Message-ID: <32B7E11E.22@wgold.demon.co.uk>
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I have a 'well known' shared memory area that is in the file system and mapped using mmap. It is dynamically created if necessary. I'd like to tidy it up, too. I can quite easily detect if a process has opened it by placing locks at hashed offsets in the file and checking to see if there are any locks in place. If not, then it should be safe to delete since I'm the last user. However, locks aren't inherited over a fork, so maybe the memory is still mapped into some child process and might be used. It is just about feasible to require a child to reapply new locks after the fork and for the parent to wait for it to do so, but really I'd like to bury this in a library. Is there any (preferably generic) way to tell whether a file has no (other) open descriptors attached to it and can be unlinked? James
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