<<On Sun, 3 Oct 1999 09:42:45 +1000 (EST), Bruce Evans <[EMAIL PROTECTED]> said:
> More details on the POSIX signal numbers: SIGBUS is mainly for accesses
> beyond the end of mmap()ed objects. It's not clear what this means in
> an address space with multiple mmap()ed objects and/or non-mmap()ed
> objects.
`Beyond the end of the object' refers to the situation where the
mmap()ed region was specified with a longer length than the underlying
object. Thus, under the following procedure:
#define PGSZ sysconf(_SC_PAGE_SIZE)
fd = shm_open(...);
ftruncate(fd, PGSZ);
p = mmap(fd, ..., 2 * PGSZ, ...);
...an access to p at offsets in the interval [PGSZ,2*PGSZ) should
generate a SIGBUS.
-GAWollman
--
Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same
[EMAIL PROTECTED] | O Siem / The fires of freedom
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick
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