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      1 /*	$NetBSD: k_helper2.c,v 1.2 2010/11/03 16:10:23 christos Exp $ */
      2 /*
      3  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
     16  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     22  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
     24  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: k_helper2.c,v 1.2 2010/11/03 16:10:23 christos Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/kernel.h>
     34 #include <sys/module.h>
     35 #include <sys/sysctl.h>
     36 
     37 #include <prop/proplib.h>
     38 
     39 MODULE(MODULE_CLASS_MISC, k_helper2, NULL);
     40 
     41 /* --------------------------------------------------------------------- */
     42 /* Sysctl interface to query information about the module.               */
     43 /* --------------------------------------------------------------------- */
     44 
     45 /* TODO: Change the integer variables below that represent booleans to
     46  * bools, once sysctl(8) supports CTLTYPE_BOOL nodes. */
     47 
     48 static struct sysctllog *clogp;
     49 static int present = 1;
     50 
     51 #define K_HELPER2 0x23456781
     52 #define K_HELPER_PRESENT 0
     53 
     54 SYSCTL_SETUP(sysctl_k_helper2_setup, "sysctl k_helper subtree setup")
     55 {
     56 
     57 	sysctl_createv(clog, 0, NULL, NULL,
     58 	               CTLFLAG_PERMANENT,
     59 	               CTLTYPE_NODE, "k_helper2", NULL,
     60 	               NULL, 0, NULL, 0,
     61 	               CTL_VENDOR, K_HELPER2, CTL_EOL);
     62 
     63 	sysctl_createv(clog, 0, NULL, NULL,
     64 	               CTLFLAG_PERMANENT,
     65 	               CTLTYPE_INT, "present",
     66 		       SYSCTL_DESCR("Whether the module was loaded or not"),
     67 		       NULL, 0, &present, 0,
     68 	               CTL_VENDOR, K_HELPER2, K_HELPER_PRESENT, CTL_EOL);
     69 }
     70 
     71 /* --------------------------------------------------------------------- */
     72 /* Module management.                                                    */
     73 /* --------------------------------------------------------------------- */
     74 
     75 static
     76 int
     77 k_helper2_init(prop_dictionary_t props)
     78 {
     79 	sysctl_k_helper2_setup(&clogp);
     80 
     81 	return 0;
     82 }
     83 
     84 static
     85 int
     86 k_helper2_fini(void *arg)
     87 {
     88 
     89 	sysctl_teardown(&clogp);
     90 
     91 	return 0;
     92 }
     93 
     94 static
     95 int
     96 k_helper2_modcmd(modcmd_t cmd, void *arg)
     97 {
     98 	int ret;
     99 
    100 	switch (cmd) {
    101 	case MODULE_CMD_INIT:
    102 		ret = k_helper2_init(arg);
    103 		break;
    104 
    105 	case MODULE_CMD_FINI:
    106 		ret = k_helper2_fini(arg);
    107 		break;
    108 
    109 	case MODULE_CMD_STAT:
    110 	default:
    111 		ret = ENOTTY;
    112 	}
    113 
    114 	return ret;
    115 }
    116