Date: Mon, 5 Jun 2006 16:36:41 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Daniel Eischen <deischen@freebsd.org> Cc: MingyanGuo <guomingyan@gmail.com>, delphij@gmail.com, freebsd-arch@freebsd.org Subject: Re: Why use `thread' as an argument of Syscalls? Message-ID: <20060605163559.N50057@fledge.watson.org> In-Reply-To: <Pine.GSO.4.64.0606051118180.14745@sea.ntplx.net> References: <1fa17f810606050044k2847e4a2i150eb934ed84006f@mail.gmail.com> <Pine.GSO.4.64.0606050744190.13542@sea.ntplx.net> <1fa17f810606050608l5bd2ec5ch37663375f6fa5b64@mail.gmail.com> <Pine.GSO.4.64.0606051118180.14745@sea.ntplx.net>
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On Mon, 5 Jun 2006, Daniel Eischen wrote: >> They are the same questions, I think ;-). Now would you please explain "why >> use `proc' as an argument of Syscalls" to me :)? I've read some source >> code of the kernel, but no comments about it found. > > I don't know. Convention? It makes sense to me. Certainly consistency. Most system calls do actually use the argument at some point -- be it to look up a file descriptor, access control, or the like, and the calling context has it for free and in-hand anyway. Robert N M Watson
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