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 *
| 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 * $Id: kern_syscalls.c,v 1.1 1999/01/09 14:15:41 dfr Exp $
| 26 * $Id: kern_syscalls.c,v 1.2 1999/01/09 14:59:50 dfr Exp $
|
27 */
28
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/systm.h>
32#include <sys/malloc.h>
33#include <sys/sysproto.h>
34#include <sys/sysent.h>
35#include <sys/syscall.h>
36#include <sys/module.h>
37#include <sys/linker.h>
38#include <sys/proc.h>
39
| 27 */
28
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/systm.h>
32#include <sys/malloc.h>
33#include <sys/sysproto.h>
34#include <sys/sysent.h>
35#include <sys/syscall.h>
36#include <sys/module.h>
37#include <sys/linker.h>
38#include <sys/proc.h>
39
|
| 40/*
41 * Acts like "nosys" but can be identified in sysent for dynamic call
42 * number assignment for a limited number of calls.
43 *
44 * Place holder for system call slots reserved for loadable modules.
45 */
|
40int
| 46int
|
| 47lkmnosys(struct proc *p, struct nosys_args *args)
48{
49 return(nosys(p, args));
50}
51
52int
|
41syscall_register(int *offset, struct sysent *new_sysent,
42 struct sysent *old_sysent)
43{
44 if (*offset == NO_SYSCALL) {
45 int i;
46
47 for (i = 1; i < SYS_MAXSYSCALL; ++i)
48 if (sysent[i].sy_call == (sy_call_t *)lkmnosys)
49 break;
50 if (i == SYS_MAXSYSCALL)
51 return ENFILE;
52 *offset = i;
53 } else if (*offset < 0 || *offset >= SYS_MAXSYSCALL)
54 return EINVAL;
55 else if (sysent[*offset].sy_call != (sy_call_t *)lkmnosys)
56 return EEXIST;
57
58 *old_sysent = sysent[*offset];
59 sysent[*offset] = *new_sysent;
60 return 0;
61}
62
63int
64syscall_deregister(int *offset, struct sysent *old_sysent)
65{
66 if (*offset)
67 sysent[*offset] = *old_sysent;
68 return 0;
69}
70
71int
72syscall_module_handler(struct module *mod, int what, void *arg)
73{
74 struct syscall_module_data *data = (struct syscall_module_data*)arg;
75 modspecific_t ms;
76 int error;
77
78 switch (what) {
79 case MOD_LOAD :
80 error = syscall_register(data->offset, data->new_sysent,
81 &data->old_sysent);
82 if (error)
83 return error;
84 ms.intval = *data->offset;
85 module_setspecific(mod, &ms);
86 break;
87 case MOD_UNLOAD :
88 error = syscall_deregister(data->offset, &data->old_sysent);
89 if (error)
90 return error;
91 break;
92 }
93 if (data->chainevh)
94 return data->chainevh(mod, what, data->chainarg);
95 else
96 return 0;
97}
| 53syscall_register(int *offset, struct sysent *new_sysent,
54 struct sysent *old_sysent)
55{
56 if (*offset == NO_SYSCALL) {
57 int i;
58
59 for (i = 1; i < SYS_MAXSYSCALL; ++i)
60 if (sysent[i].sy_call == (sy_call_t *)lkmnosys)
61 break;
62 if (i == SYS_MAXSYSCALL)
63 return ENFILE;
64 *offset = i;
65 } else if (*offset < 0 || *offset >= SYS_MAXSYSCALL)
66 return EINVAL;
67 else if (sysent[*offset].sy_call != (sy_call_t *)lkmnosys)
68 return EEXIST;
69
70 *old_sysent = sysent[*offset];
71 sysent[*offset] = *new_sysent;
72 return 0;
73}
74
75int
76syscall_deregister(int *offset, struct sysent *old_sysent)
77{
78 if (*offset)
79 sysent[*offset] = *old_sysent;
80 return 0;
81}
82
83int
84syscall_module_handler(struct module *mod, int what, void *arg)
85{
86 struct syscall_module_data *data = (struct syscall_module_data*)arg;
87 modspecific_t ms;
88 int error;
89
90 switch (what) {
91 case MOD_LOAD :
92 error = syscall_register(data->offset, data->new_sysent,
93 &data->old_sysent);
94 if (error)
95 return error;
96 ms.intval = *data->offset;
97 module_setspecific(mod, &ms);
98 break;
99 case MOD_UNLOAD :
100 error = syscall_deregister(data->offset, &data->old_sysent);
101 if (error)
102 return error;
103 break;
104 }
105 if (data->chainevh)
106 return data->chainevh(mod, what, data->chainarg);
107 else
108 return 0;
109}
|