linux_common.c revision 350889 
1/*-
2 * Copyright (c) 2014 Vassilis Laganakos
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/compat/linux/linux_common.c 350889 2019-08-12 08:37:59Z avg $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/exec.h>
33#include <sys/imgact.h>
34#include <sys/imgact_elf.h>
35#include <sys/kernel.h>
36#include <sys/malloc.h>
37#include <sys/eventhandler.h>
38#include <sys/sx.h>
39#include <sys/sysctl.h>
40
41#include <compat/linux/linux_emul.h>
42#include <compat/linux/linux_ioctl.h>
43#include <compat/linux/linux_mib.h>
44#include <compat/linux/linux_util.h>
45
46FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
47FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
48
49MODULE_VERSION(linux_common, 1);
50
51SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
52
53TAILQ_HEAD(, linux_ioctl_handler_element) linux_ioctl_handlers =
54    TAILQ_HEAD_INITIALIZER(linux_ioctl_handlers);
55struct sx linux_ioctl_sx;
56SX_SYSINIT(linux_ioctl, &linux_ioctl_sx, "Linux ioctl handlers");
57
58static eventhandler_tag linux_exec_tag;
59static eventhandler_tag linux_thread_dtor_tag;
60static eventhandler_tag	linux_exit_tag;
61
62
63static int
64linux_common_modevent(module_t mod, int type, void *data)
65{
66	struct linux_device_handler **ldhp;
67
68	switch(type) {
69	case MOD_LOAD:
70		linux_osd_jail_register();
71		linux_exit_tag = EVENTHANDLER_REGISTER(process_exit,
72		    linux_proc_exit, NULL, 1000);
73		linux_exec_tag = EVENTHANDLER_REGISTER(process_exec,
74		    linux_proc_exec, NULL, 1000);
75		linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor,
76		    linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY);
77		SET_FOREACH(ldhp, linux_device_handler_set)
78			linux_device_register_handler(*ldhp);
79		break;
80	case MOD_UNLOAD:
81		linux_osd_jail_deregister();
82		SET_FOREACH(ldhp, linux_device_handler_set)
83			linux_device_unregister_handler(*ldhp);
84		EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
85		EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
86		EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag);
87		break;
88	default:
89		return (EOPNOTSUPP);
90	}
91	return (0);
92}
93
94static moduledata_t linux_common_mod = {
95	"linuxcommon",
96	linux_common_modevent,
97	0
98};
99
100DECLARE_MODULE(linuxcommon, linux_common_mod, SI_SUB_EXEC, SI_ORDER_ANY);
101MODULE_VERSION(linuxcommon, 1);
102