external/bsd/iscsi/dist/src/initiator/libkmod.c

   1 /*      $NetBSD: libkmod.c,v 1.1 2009/06/20 04:12:55 agc Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: libkmod.c,v 1.1 2009/06/20 04:12:55 agc Exp $");
  32 #endif /* !lint */
  33
  34 #include <sys/module.h>
  35
  36 #include <prop/proplib.h>
  37
  38 #include <assert.h>
  39 #include <err.h>
  40 #include <stdbool.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "libkmod.h"
  47
  48 #ifdef USE_LIBKMOD
  49
  50 static const char *classes[] = {
  51         "any",
  52         "misc",
  53         "vfs",
  54         "driver",
  55         "exec",
  56 };
  57
  58 static const char *sources[] = {
  59         "builtin",
  60         "boot",
  61         "filesys",
  62 };
  63
  64 /* comparison routine for qsort */
  65 static int
  66 modcmp(const void *a, const void *b)
  67 {
  68         const modstat_t *msa, *msb;
  69
  70         msa = a;
  71         msb = b;
  72         return strcmp(msa->ms_name, msb->ms_name);
  73 }
  74
  75 /* function which "opens" a module */
  76 int
  77 openkmod(kernel_t *kernel)
  78 {
  79         kernel->size = 4096;
  80         for (;;) {
  81                 kernel->iov.iov_base = malloc(kernel->size);
  82                 kernel->iov.iov_len = kernel->size;
  83                 if (modctl(MODCTL_STAT, &kernel->iov)) {
  84                         warn("modctl(MODCTL_STAT)");
  85                         return 0;
  86                 }
  87                 if (kernel->size >= kernel->iov.iov_len) {
  88                         break;
  89                 }
  90                 free(kernel->iov.iov_base);
  91                 kernel->size = kernel->iov.iov_len;
  92         }
  93         kernel->size = kernel->iov.iov_len / sizeof(modstat_t);
  94         qsort(kernel->iov.iov_base, kernel->size, sizeof(modstat_t), modcmp);
  95         return 1;
  96 }
  97
  98 /* return details on the module */
  99 int
 100 readkmod(kernel_t *kernel, kmod_t *module)
 101 {
 102         modstat_t *ms;
 103
 104         if (kernel->c * sizeof(*ms) >= kernel->iov.iov_len) {
 105                 return 0;
 106         }
 107         ms = kernel->iov.iov_base;
 108         ms += kernel->c++;
 109         (void) memset(module, 0x0, sizeof(*module));
 110         module->name = strdup(ms->ms_name);
 111         module->class = strdup(classes[ms->ms_class]);
 112         module->source = strdup(sources[ms->ms_source]);
 113         module->refcnt = ms->ms_refcnt;
 114         module->size = ms->ms_size;
 115         if (ms->ms_required[0]) {
 116                 module->required = strdup(ms->ms_required);
 117         }
 118         return 1;
 119 }
 120
 121 /* free up all resources allocated in a module read */
 122 void
 123 freekmod(kmod_t *module)
 124 {
 125         (void) free(module->name);
 126         (void) free(module->class);
 127         (void) free(module->source);
 128         if (module->required) {
 129                 (void) free(module->required);
 130         }
 131 }
 132
 133 /* "close" the module */
 134 int
 135 closekmod(kernel_t *kernel)
 136 {
 137         (void) free(kernel->iov.iov_base);
 138         return 1;
 139 }
 140
 141 /* do the modstat operation */
 142 int
 143 kmodstat(const char *modname, FILE *fp)
 144 {
 145         kernel_t        kernel;
 146         kmod_t          module;
 147         int             modc;
 148
 149         (void) memset(&kernel, 0x0, sizeof(kernel));
 150         (void) memset(&module, 0x0, sizeof(module));
 151         if (!openkmod(&kernel)) {
 152                 (void) fprintf(stderr, "can't read kernel modules\n");
 153                 return 0;
 154         }
 155         for (modc = 0 ; readkmod(&kernel, &module) ; ) {
 156                 if (modname == NULL || strcmp(modname, module.name) == 0) {
 157                         if (modc++ == 0) {
 158                                 if (fp) {
 159                                         (void) fprintf(fp,
 160                                                 "NAME\t\tCLASS\tSOURCE\tREFS"
 161                                                 "\tSIZE\tREQUIRES\n");
 162                                 }
 163                         }
 164                         if (fp) {
 165                                 (void) fprintf(fp, "%-16s%s\t%s\t%d\t%u\t%s\n",
 166                                 module.name,
 167                                 module.class,
 168                                 module.source,
 169                                 module.refcnt,
 170                                 module.size,
 171                                 (module.required) ? module.required : "-");
 172                         }
 173                         freekmod(&module);
 174                 }
 175         }
 176         (void) closekmod(&kernel);
 177         return modc;
 178 }
 179
 180 /* load the named module into the kernel */
 181 int
 182 kmodload(const char *module)
 183 {
 184         prop_dictionary_t        props;
 185         modctl_load_t            cmdargs;
 186         char                    *propsstr;
 187
 188         props = prop_dictionary_create();
 189
 190         propsstr = prop_dictionary_externalize(props);
 191         if (propsstr == NULL) {
 192                 (void) fprintf(stderr, "Failed to process properties");
 193                 return 0;
 194         }
 195
 196         cmdargs.ml_filename = module;
 197         cmdargs.ml_flags = 0;
 198         cmdargs.ml_props = propsstr;
 199         cmdargs.ml_propslen = strlen(propsstr);
 200
 201         if (modctl(MODCTL_LOAD, &cmdargs)) {
 202                 (void) fprintf(stderr, "modctl failure\n");
 203                 return 0;
 204         }
 205
 206         (void) free(propsstr);
 207         prop_object_release(props);
 208
 209         return 1;
 210 }
 211
 212 /* and unload the module from the kernel */
 213 int
 214 kmodunload(const char *name)
 215 {
 216         return modctl(MODCTL_UNLOAD, __UNCONST(name)) == 0;
 217 }
 218
 219 #endif /* USE_LIBKMOD */