1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29 #include <sys/param.h>
30 #include <sys/proc.h>
31 #include <sys/module.h>
32 #include <sys/sysproto.h>
33 #include <sys/sysent.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36
37 /*
38 * The function for implementing the syscall.
39 */
40 static int
hello(struct thread * td,void * arg)41 hello(struct thread *td, void *arg)
42 {
43
44 printf("hello kernel\n");
45 return (0);
46 }
47
48 /*
49 * The `sysent' for the new syscall
50 */
51 static struct sysent hello_sysent = {
52 .sy_narg = 0,
53 .sy_call = hello
54 };
55
56 /*
57 * The offset in sysent where the syscall is allocated.
58 */
59 static int offset = NO_SYSCALL;
60
61 /*
62 * The function called at load/unload.
63 */
64 static int
load(struct module * module,int cmd,void * arg)65 load(struct module *module, int cmd, void *arg)
66 {
67 int error = 0;
68
69 switch (cmd) {
70 case MOD_LOAD :
71 printf("syscall loaded at %d\n", offset);
72 break;
73 case MOD_UNLOAD :
74 printf("syscall unloaded from %d\n", offset);
75 break;
76 default :
77 error = EOPNOTSUPP;
78 break;
79 }
80 return (error);
81 }
82
83 SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL);
84