xref: /freebsd/sys/compat/linux/linux_common.c (revision cddbc3b40812213ff00041f79174cac0be360a2a)
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("$FreeBSD$");
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 
46 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
47 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
48 
49 MODULE_VERSION(linux_common, 1);
50 
51 SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
52 
53 TAILQ_HEAD(, linux_ioctl_handler_element) linux_ioctl_handlers =
54     TAILQ_HEAD_INITIALIZER(linux_ioctl_handlers);
55 struct sx linux_ioctl_sx;
56 SX_SYSINIT(linux_ioctl, &linux_ioctl_sx, "Linux ioctl handlers");
57 
58 static eventhandler_tag linux_exec_tag;
59 static eventhandler_tag linux_thread_dtor_tag;
60 static eventhandler_tag	linux_exit_tag;
61 
62 
63 static int
64 linux_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 
94 static moduledata_t linux_common_mod = {
95 	"linuxcommon",
96 	linux_common_modevent,
97 	0
98 };
99 
100 DECLARE_MODULE(linuxcommon, linux_common_mod, SI_SUB_EXEC, SI_ORDER_ANY);
101