Date: Thu, 12 Jul 2001 15:32:28 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Yonny Cardenas <ycardena@yahoo.com> Cc: questions@FreeBSD.ORG Subject: Re: Some questions about kernel programming Message-ID: <20010712153228.E20322@xor.obsecurity.org> In-Reply-To: <3B4E06F1.2030808@yahoo.com>; from ycardena@yahoo.com on Thu, Jul 12, 2001 at 03:22:09PM -0500 References: <3B4E06F1.2030808@yahoo.com>
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--jKBxcB1XkHIR0Eqt Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 12, 2001 at 03:22:09PM -0500, Yonny Cardenas wrote: > Dear Friends >=20 > I have some questions about kernel programming: >=20 > 1. Why I can call some system calls functions into the kernel but > another not?, for example: I can call printf(), but I can't call > socket(). system calls are functions exposed by the kernel to userland. printf() is not a syscall, it's a function implemented within the kernel. syscalls aren't available as functions within the kernel. You generally have to work harder to achieve the same functionality within the kernel. I suggest reading the _Design and Implementation of the 4.4BSD Operating System_ if you're trying to do something here; chances are you'll need a lot more information than you currently have available, most of which should be in that book. This question might be more appropriate for the -hackers mailing list. Kris --jKBxcB1XkHIR0Eqt Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE7TiV7Wry0BWjoQKURAo8lAKDwLsgXzrAYAVLL7Mor0XufFPvajQCeKpPb /bt2ihZ+DvMqpsg2CHOrwhk= =K4fh -----END PGP SIGNATURE----- --jKBxcB1XkHIR0Eqt-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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