Re: socket creation synchronization
Re: socket creation synchronization
- Subject: Re: socket creation synchronization
- From: Josh Graessley <email@hidden>
- Date: Mon, 5 Dec 2005 15:15:52 -0800
What type of socket are you creating? What gets passed in so
sock_socket for domain, type and protocol?
Adding to the list of protocols by registering a new protosw or domain
structure is not supported. The locking model has not been documented.
-josh
On Dec 5, 2005, at 1:30 PM, Christopher Vitale wrote:
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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