Hello List,
I have a question about socket creation in 10.4.3.
You can arrive at socreate by calling the kpi sock_socket, or from the
userland syscall socket. Regardless, socreate calls pffindproto or
pffindtype. These domain functions both assert that nobody else is holding a
certain lock. How is this guaranteed? There isn't even a funnel associated
with the socket syscall in syscalls.master. I looked around the source for a
while but nothing jumped out at me.
I'm interested because I've got a kext that creates a connection via
sock_socket. When I call sock_socket while other (userland) sockets are
being created I'll occasionally die a horrible death on the pffindproto lock
assert. I'll only create a single connection for the life of the kext. Does
socket creation in the kernel bypass synchronization at a higher level?
Also, the socket I create is a system socket to another kext. Is this an
appropriate way for kexts to share information? I take the necessary
precautions like not allowing the server kext to unload while connected,
forcing the client kext to disconnect when unloaded, etc.
Thanks,
vitale
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