...snip, snip... AIX:
Doesn't really fail in the normal sense of not putting the right data on the wire, but can trigger a kernel memory issue if some kernel tuning is incorrect. So always fail if the APR_SENDFILE_AUTODETECT is on. (This kernel tuning is irrelevant unless sendfile or more obscure TCP usage is actually occuring, so the tuning issue has typically been there all along without hurting anything.)
Is the kernel turning incorrect on AIX by default? Will this be fixed in some future releases? You could do lots of things to corrupt your kernel by tuning in other ways - so unless this is by default, I can't see why we should block this.
...snip, snip...
+1 to this list of exceptions and adding a new flag called APR_SENDFILE_CHECK (or APR_SENDFILE_AUTODETECT) to apr_socket_sendfile. -- justin
