Mercurial > flash_v2

annotate packages/net/snmp/agent/current/src/kernel.c @ 103:95f3e12a6327 ecos-sw-2000-06-23

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Merge from eCos master repository on 2000-06-23-16:41:10-BST
author jlarmour
date Fri, 23 Jun 2000 17:06:31 +0000
parents
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // ./agent/current/src/kernel.c
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4 //
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5 //
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6 //==========================================================================
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7 //####COPYRIGHTBEGIN####
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8 //
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9 // -------------------------------------------
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10 // The contents of this file are subject to the Red Hat eCos Public License
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11 // Version 1.1 (the "License"); you may not use this file except in
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12 // compliance with the License. You may obtain a copy of the License at
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13 // http://www.redhat.com/
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14 //
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15 // Software distributed under the License is distributed on an "AS IS"
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16 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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17 // License for the specific language governing rights and limitations under
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18 // the License.
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19 //
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20 // The Original Code is eCos - Embedded Configurable Operating System,
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21 // released September 30, 1998.
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22 //
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23 // The Initial Developer of the Original Code is Red Hat.
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24 // Portions created by Red Hat are
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25 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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26 // All Rights Reserved.
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27 // -------------------------------------------
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28 //
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29 //####COPYRIGHTEND####
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30 //####UCDSNMPCOPYRIGHTBEGIN####
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31 //
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32 // -------------------------------------------
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33 //
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34 // Portions of this software may have been derived from the UCD-SNMP
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35 // project, <http://ucd-snmp.ucdavis.edu/> from the University of
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36 // California at Davis, which was originally based on the Carnegie Mellon
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37 // University SNMP implementation. Portions of this software are therefore
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38 // covered by the appropriate copyright disclaimers included herein.
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39 //
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40 // The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
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41 // -------------------------------------------
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42 //
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43 //####UCDSNMPCOPYRIGHTEND####
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44 //==========================================================================
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45 //#####DESCRIPTIONBEGIN####
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46 //
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47 // Author(s): hmt
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48 // Contributors: hmt
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49 // Date: 2000-05-30
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50 // Purpose: Port of UCD-SNMP distribution to eCos.
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51 // Description:
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52 //
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //==========================================================================
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57 /********************************************************************
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58 Copyright 1989, 1991, 1992 by Carnegie Mellon University
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59
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60 Derivative Work -
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61 Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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62
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63 All Rights Reserved
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64
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65 Permission to use, copy, modify and distribute this software and its
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66 documentation for any purpose and without fee is hereby granted,
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67 provided that the above copyright notice appears in all copies and
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68 that both that copyright notice and this permission notice appear in
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69 supporting documentation, and that the name of CMU and The Regents of
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70 the University of California not be used in advertising or publicity
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71 pertaining to distribution of the software without specific written
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72 permission.
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73
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74 CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
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75 WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
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76 WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
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77 THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
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78 INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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79 FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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80 CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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81 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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82 *********************************************************************/
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83
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84 /*
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85 * 13 Jun 91 wsak (wk0x@andrew) added mips support
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86 */
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87
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88 #include <config.h>
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89
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90 #ifdef CAN_USE_NLIST
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91
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92 #include <sys/types.h>
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93 #if HAVE_UNISTD_H
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94 #include <unistd.h>
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95 #endif
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96 #include <stdio.h>
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97 #include <errno.h>
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98 #if HAVE_STRING_H
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99 #include <string.h>
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100 #endif
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101 #if HAVE_FCNTL_H
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102 #include <fcntl.h>
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103 #endif
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104 #if HAVE_NETINET_IN_H
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105 #include <netinet/in.h>
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106 #endif
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107 #if HAVE_KVM_H
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108 #include <kvm.h>
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109 #endif
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110
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111 #include "asn1.h"
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112 #include "snmp_api.h"
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113 #include "snmp_impl.h"
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114 #include "snmp_logging.h"
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115 #include "default_store.h"
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116
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117 #include "kernel.h"
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118 #include "ds_agent.h"
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119
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120 #ifndef NULL
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121 #define NULL 0
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122 #endif
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123
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124
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125 #if HAVE_KVM_H
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126 kvm_t *kd;
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127
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128 void
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129 init_kmem(const char *file)
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130 {
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131 #if HAVE_KVM_OPENFILES
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132 char err[4096];
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133 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, err);
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134 if (kd == NULL && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)) {
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135 snmp_log(LOG_CRIT, "init_kmem: kvm_openfiles failed: %s\n", err);
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136 exit(1);
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137 }
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138 #else
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139 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
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140 if (!kd && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)) {
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141 snmp_log(LOG_CRIT, "init_kmem: kvm_open failed: %s\n", strerror(errno));
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142 exit(1);
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143 }
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144 #endif /* HAVE_KVM_OPENFILES */
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145 }
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146
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147
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148 /*
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149 * klookup:
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150 *
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151 * It seeks to the location off in kmem
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152 * It does a read into target of siz bytes.
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153 *
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154 * Return 0 on failure and 1 on sucess.
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155 *
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156 */
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157
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158
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159 int
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160 klookup(unsigned long off,
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161 char *target,
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162 int siz)
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163 {
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164 int result;
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165 if (kd == NULL) return 0;
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166 result = kvm_read(kd, off, target, siz);
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167 if (result != siz) {
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168 #if HAVE_KVM_OPENFILES
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169 snmp_log(LOG_ERR,"kvm_read(*, %lx, %p, %d) = %d: %s\n", off, target, siz,
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170 result, kvm_geterr(kd));
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171 #else
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172 snmp_log(LOG_ERR,"kvm_read(*, %lx, %p, %d) = %d: ", off, target, siz,
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173 result);
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174 snmp_log_perror("klookup");
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175 #endif
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176 return 0;
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177 }
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178 return 1;
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179 }
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180
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181 #else /* HAVE_KVM_H */
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182
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183 static off_t klseek (off_t);
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184 static int klread (char *, int);
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185 int swap, mem, kmem;
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186
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187 void
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188 init_kmem(const char *file)
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189 {
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190 kmem = open(file, O_RDONLY);
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191 if (kmem < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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192 snmp_log_perror(file);
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193 exit(1);
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194 }
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195 fcntl(kmem,F_SETFD,1);
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196 mem = open("/dev/mem",O_RDONLY);
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197 if (mem < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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198 snmp_log_perror("/dev/mem");
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199 exit(1);
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200 }
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201 fcntl(mem,F_SETFD,1);
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202 #ifdef DMEM_LOC
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203 swap = open(DMEM_LOC,O_RDONLY);
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204 if (swap < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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205 snmp_log_perror(DMEM_LOC);
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206 exit(1);
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207 }
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208 fcntl(swap,F_SETFD,1);
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209 #endif
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210 }
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211
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212
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213 /*
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214 * Seek into the kernel for a value.
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215 */
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216 static off_t
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217 klseek(off_t base)
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218 {
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219 return (lseek(kmem, (off_t)base, SEEK_SET));
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220 }
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221
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222
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223 /*
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224 * Read from the kernel
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225 */
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226 static int
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227 klread(char *buf,
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228 int buflen)
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229 {
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230 return (read(kmem, buf, buflen));
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231 }
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232
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233
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234 /*
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235 * klookup:
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236 *
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237 * It seeks to the location off in kmem
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238 * It does a read into target of siz bytes.
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239 *
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240 * Return 0 on failure and 1 on sucess.
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241 *
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242 */
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243
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244
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245 int
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246 klookup(unsigned long off,
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247 char *target,
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248 int siz)
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249 {
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250 long retsiz;
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251
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252 if (kmem < 0) return 0;
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253
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254 if ((retsiz = klseek((off_t) off)) != off) {
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255 snmp_log(LOG_ERR, "klookup(%lx, %p, %d): ", off, target, siz);
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256 snmp_log_perror("klseek");
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257 #ifdef EXIT_ON_BAD_KLREAD
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258 exit(1);
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259 #endif
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260 return (0);
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261 }
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262 if ((retsiz = klread(target, siz)) != siz ) {
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263 if (snmp_get_do_debugging()) {
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264 /* these happen too often on too many architectures to print them
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265 unless we're in debugging mode. People get very full log files. */
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266 snmp_log(LOG_ERR, "klookup(%lx, %p, %d): ", off, target, siz);
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267 snmp_log_perror("klread");
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268 }
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269 #ifdef EXIT_ON_BAD_KLREAD
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270 exit(1);
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271 #endif
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272 return(0);
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273 }
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274 return (1);
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275 }
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276
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277 #endif /* HAVE_KVM_H */
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278
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279 #endif /* CAN_USE_NLIST */