net: separate pollster initialization from network file descriptor
Unlike the existing net package own pollster, runtime-integrated
network pollster on BSD variants, actually kqueue, requires a socket
that has beed passed to syscall.Listen previously for a stream
This CL separates pollDesc.Init (actually runtime_pollOpen) from newFD
to allow control of each state of sockets and adds init method to netFD
instead. Upcoming CLs will rearrange the call order of
pollster and syscall functions like the following;
- For dialers that open active connections, runtime_pollOpen will be
called in between syscall.Bind and syscall.Connect.
- For stream listeners that open passive stream connections,
runtime_pollOpen will be called just after syscall.Listen.
- For datagram listeners that open datagram connections,
runtime_pollOpen will be called just after syscall.Bind.
This is in preparation for runtime-integrated network pollster for BSD
Update issue 5199
R=dvyukov, alex.brainman, minux.ma
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