Date: Sat, 03 Feb 2024 10:04:33 +0100 From: "Dave Cottlehuber" <dch@skunkwerks.at> To: "Brooks Davis" <brooks@freebsd.org> Cc: current@freebsd.org Subject: Re: libc/libsys split coming soon Message-ID: <458c2a3b-1139-4449-a4a9-f23782686dea@app.fastmail.com> In-Reply-To: <Zb1tTz5LXuVQ5Caj@spindle.one-eyed-alien.net> References: <Zb1tTz5LXuVQ5Caj@spindle.one-eyed-alien.net>
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On Fri, 2 Feb 2024, at 23:31, Brooks Davis wrote: > TL;DR: The implementation of system calls is moving to a seperate > library (libsys). No changes are required to existing software (except > to ensure that libsys is present when building custom disk images). > > Code: https://github.com/freebsd/freebsd-src/pull/908 > > After nearly a decade of intermittent work, I'm about to land a series > of patches which moves system calls, vdso support, and libc's parsing = of > the ELF auxiliary argument vector into a separate library (libsys). I > plan to do this early next week (February 5th). > > This change serves three primary purposes: > 1. It's easier to completely replace system call implementations for > tracing or compartmentalization purposes. > 2. It simplifies the implementation of restrictions on system calls = such > as those implemented by OpenBSD's msyscall(2) > (https://man.openbsd.org/msyscall.2). > 3. It allows language runtimes to link with libsys for system call > implementations without requiring libc. Awesome! So (3) is generally considered ideal for languages like zig[1],= rust or go, to use directly? What=E2=80=99s the appropriate mechanism for such a language to know whi= ch version of FreeBSD it=E2=80=99s talking to, to ensure syscall table m= atches the languages expectations? It would be nice to hear about any experiments in (2) and how that compa= res to things such as capsicum. [1]: https://github.com/ziglang/zig/issues/165 A+ Dave
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