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Re: Revisiting DTrace syscall provider

On Wed, 25 Feb 2015, Paul Goyette wrote:

modules that provide sys-calls. Without the module loaded, the syscall entry point is known no-op; when the module tries to unload, all of its syscalls are checked, and if any of them points to somewhere NOT THE NOOP, unload is prevented.

Actually, the code checks to see if any those syscalls are currently active for any processes.

IIRC, the relevant code is in routine syscall_disestablish() in file src/sys/kern_syscalls.c

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