111 lines
4.1 KiB
C
111 lines
4.1 KiB
C
/* 25 May 93*/
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/*
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* newsyscall.c
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*
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* 05 Jun 93 Terry Lambert Split mycall.c out
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* 25 May 93 Terry Lambert Original
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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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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/sysent.h>
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#include <sys/lkm.h>
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/* XXX this should be in a header. */
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extern int mycall __P((struct proc *p, void *uap, int retval[]));
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/* XXX these should be generated by MOD_SYSCALL(). */
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static int newsyscall_load __P((struct lkm_table *lkmtp, int cmd));
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extern int newsyscall_mod __P((struct lkm_table *lkmtp, int cmd, int ver));
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/*
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* These two entries define our system call and module information. We
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* have 0 arguments to our system call.
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*/
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static struct sysent newent = {
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0, mycall /* # of args, function pointer*/
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};
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MOD_SYSCALL(newsyscall_mod, -1, &newent);
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/*
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* This function is called each time the module is loaded. Technically,
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* we could have made this "lkm_nullcmd" in the "MOD_DISPATCH" in
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* "newsyscall()", but it's a convenient place to kick a copyright out
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* to the console.
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*/
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static int
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newsyscall_load( lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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if( cmd == LKM_E_LOAD) { /* print copyright on console*/
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printf( "\nSample Loaded system call\n");
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printf( "Copyright (c) 1993\n");
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printf( "Terrence R. Lambert\n");
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printf( "All rights reserved\n");
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}
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return( 0);
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}
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/*
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* External entry point; should generally match name of .o file. The
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* arguments are always the same for all loaded modules. The "load",
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* "unload", and "stat" functions in "MOD_DISPATCH" will be called under
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* their respective circumstances unless their value is "lkm_nullcmd". If
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* called, they are called with the same arguments (cmd is included to
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* allow the use of a single function, ver is included for version
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* matching between modules and the kernel loader for the modules).
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*
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* Since we expect to link in the kernel and add external symbols to
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* the kernel symbol name space in a future version, generally all
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* functions used in the implementation of a particular module should
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* be static unless they are expected to be seen in other modules or
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* to resolve unresolved symbols alread existing in the kernel (the
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* second case is not likely to ever occur).
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*
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* The entry point should return 0 unless it is refusing load (in which
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* case it should return an errno from errno.h).
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*/
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int
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newsyscall_mod( lkmtp, cmd, ver)
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struct lkm_table *lkmtp;
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int cmd;
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int ver;
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{
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MOD_DISPATCH(newsyscall_mod, lkmtp, cmd, ver,
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newsyscall_load, lkm_nullcmd, lkm_nullcmd)
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}
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