"Albert D. Cahalan" <acahalan@cs.uml.edu> writes:
> This bit of the Unix98 standard might apply:
>
> ---- begin quote ----
> The implementation may implement message queues, semaphores, or shared
> memory objects as distinct file types. The following macros test
> whether a file is of the specified type. The value of the buf argument
> supplied to the macros is a pointer to a stat structure. The macro
> evaluates to a non-zero value if the specified object is implemented
> as a distinct file type and the specified file type is contained in
> the stat structure referenced by buf. Otherwise, the macro evaluates
> to zero.
>
> S_TYPEISMQ(buf) Test for a message queue
> S_TYPEISSEM(buf) Test for a semaphore
> S_TYPEISSHM(buf) Test for a shared memory object
> ---- end quote ----
>
> File types 030000, 050000, 070000, 0130000, and 0170000 are available.
> (0x3000 0x5000 0x7000 0xb000 0xf000)
I think these tests apply if you do these types of files as special
files in normal file systems (AFAIK True64 does it this way).
Greetings
Christoph
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