1 /*-
2 * Copyright (c) 1999 Assar Westerlund
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/share/examples/kld/syscall/module/syscall.c,v 1.2 1999/08/28 00:19:23 peter Exp $
27 * $DragonFly: src/share/examples/kld/syscall/module/syscall.c,v 1.2 2003/06/17 04:36:57 dillon Exp $
28 */
29
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/proc.h>
33 #include <sys/module.h>
34 #include <sys/sysent.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37
38 /*
39 * The function for implementing the syscall.
40 */
41
42 static int
hello(void __unused * arg)43 hello (void __unused *arg)
44 {
45 kprintf ("hello kernel\n");
46 return 0;
47 }
48
49 /*
50 * The `sysent' for the new syscall
51 */
52
53 static struct sysent hello_sysent = {
54 0, /* sy_narg */
55 hello /* sy_call */
56 };
57
58 /*
59 * The offset in sysent where the syscall is allocated.
60 */
61
62 static int offset = NO_SYSCALL;
63
64 /*
65 * The function called at load/unload.
66 */
67
68 static int
load(struct module __unused * module,int cmd,void __unused * arg)69 load (struct module __unused *module, int cmd, void __unused *arg)
70 {
71 int error = 0;
72
73 switch (cmd) {
74 case MOD_LOAD :
75 kprintf ("syscall loaded at %d\n", offset);
76 break;
77 case MOD_UNLOAD :
78 kprintf ("syscall unloaded from %d\n", offset);
79 break;
80 default :
81 error = EINVAL;
82 break;
83 }
84 return error;
85 }
86
87 SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL);
88