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