FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_common.c

     /*-
      * Copyright (c) 2014 Vassilis Laganakos
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/compat/linux/linux_common.c 340258 2018-11-08 19:56:29Z tijl $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/exec.h>
    #include <sys/imgact.h>
    #include <sys/imgact_elf.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/eventhandler.h>
    #include <sys/sx.h>
    #include <sys/sysctl.h>
    
    #include <compat/linux/linux_emul.h>
    #include <compat/linux/linux_ioctl.h>
    #include <compat/linux/linux_mib.h>
    #include <compat/linux/linux_util.h>
    
    FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
    FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
    
    MODULE_VERSION(linux_common, 1);
    
    SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
    
    TAILQ_HEAD(, linux_ioctl_handler_element) linux_ioctl_handlers =
        TAILQ_HEAD_INITIALIZER(linux_ioctl_handlers);
    struct sx linux_ioctl_sx;
    SX_SYSINIT(linux_ioctl, &linux_ioctl_sx, "Linux ioctl handlers");
    
    static eventhandler_tag linux_exec_tag;
    static eventhandler_tag linux_thread_dtor_tag;
    static eventhandler_tag linux_exit_tag;
    
    
    static int
    linux_common_modevent(module_t mod, int type, void *data)
    {
            struct linux_device_handler **ldhp;
    
            switch(type) {
            case MOD_LOAD:
                    linux_osd_jail_register();
                    linux_exit_tag = EVENTHANDLER_REGISTER(process_exit,
                        linux_proc_exit, NULL, 1000);
                    linux_exec_tag = EVENTHANDLER_REGISTER(process_exec,
                        linux_proc_exec, NULL, 1000);
                    linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor,
                        linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY);
                    SET_FOREACH(ldhp, linux_device_handler_set)
                            linux_device_register_handler(*ldhp);
                    break;
            case MOD_UNLOAD:
                    linux_osd_jail_deregister();
                    SET_FOREACH(ldhp, linux_device_handler_set)
                            linux_device_unregister_handler(*ldhp);
                    EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
                    EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
                    EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag);
                    break;
            default:
                    return (EOPNOTSUPP);
            }
            return (0);
    }
    
    static moduledata_t linux_common_mod = {
            "linuxcommon",
            linux_common_modevent,
            0
    };
    
   DECLARE_MODULE(linuxcommon, linux_common_mod, SI_SUB_EXEC, SI_ORDER_ANY);

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