Messages in this thread | | | From | shaggy@jade ... | Subject | Re: Shared Memory | Date | Mon, 12 May 1997 00:03:53 -0400 (EDT) |
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> > > > Does anyone know of a systtem call that is available so that given a > > process ID and a physical range of pages, one process could map that > > physical memory into the address space of the process that corresponds to > > the given PID? > > If you use the mmap() call on /dev/mem you can do this, it's a well > known hack for accessing hardware from user-space. >
The only catch with this is that it does not allow me to map into ANOTHER process' address space, only my own. The problem I am trying to address is that I have one process running as root and another process that is not. The non-root process communicates with the root process and asks it for locked-in pages. The root process will then map the locked pages it has in its address space into the client's address space and return a pointer to this area back to the client. As far as I know mmap only operates on one's own address space. If I could somehow modify it so it worked on another process' address space, that would rock.
-S
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