How are syscall functions defined?

Reply: Pat Maddox: "Re: How are syscall functions defined?"
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From: Pat Maddox <pat_at_patmaddox.com>
Date: Sat, 01 Jul 2023 10:11:40 UTC

jail_attach is defined in syscalls.master [1] which generates a declaration in jail.h [2]. Try as I might, I can’t find any definition of that specific syscall function (or any other).  I think the closest I’ve found is sys_jail_attach in kern_jail.c [3]. I suspect there’s some generation going on that defines jail_attach - but if that’s the case, I haven’t been able to track it down.

Can someone point me to how the C function gets defined?

Thanks,
Pat

[1] https://github.com/freebsd/freebsd-src/blob/releng/13.2/sys/kern/syscalls.master#L2307
[2] https://github.com/freebsd/freebsd-src/blob/releng/13.2/sys/sys/jail.h#L119
[3] https://github.com/freebsd/freebsd-src/blob/releng/13.2/sys/kern/kern_jail.c#L2340