78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
/* $NetBSD: example_syscall.c,v 1.6 2007/12/19 20:31:39 dsl Exp $ */
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/*
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* example_syscall.c
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*
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* 05 Jun 93 Terry Lambert Split out of newsyscall.c
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*
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* Copyright (c) 1993 Terrence R. Lambert.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Terrence R. Lambert.
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* 4. The name Terrence R. Lambert may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: example_syscall.c,v 1.6 2007/12/19 20:31:39 dsl Exp $");
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/systm.h>
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int example_syscall(struct lwp *, void *, register_t *);
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/*
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* This is the actual code for system call... it can be static because
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* we've externed it up above... the only plae it needs to be referenced
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* is the sysent we are interested in.
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*
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* To write your own system call using this as a template, you could strip
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* out this code and use the rest as a prototype module, changing only the
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* function names and the number of arguments to the call in the module
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* specific "sysent".
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*
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* You would have to use the "-R" option of "ld" to ensure a linkable file
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* if you were to do this, since you would need to combine multiple ".o"
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* files into a single ".o" file for use by "modload".
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*/
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int
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example_syscall(l, uap, retval)
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struct lwp *l;
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void *uap;
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register_t retval[];
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{
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/*
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* Our new system call simply prints a message; it takes no
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* arguments.
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*/
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printf( "I am a loaded system call using the kernel printf!\n");
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printf( "I will print this message each time I am called!\n");
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return (0); /* success (or error code from errno.h)*/
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}
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