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annotate libfdcore/extensions.c @ 732:4a0b61061a6d

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Added simple mechanism to declare dependencies between extensions
author Sebastien Decugis <sdecugis@nict.go.jp>
date Fri, 25 Feb 2011 15:46:40 +0900
parents 4ffbc9f1e922
children 4a9f08d6b6ba
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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2e94ef0515d7 Updated copyright information
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5 * Copyright (c) 2011, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fdcore-internal.h"
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37
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38 #include <dlfcn.h> /* We may use libtool's <ltdl.h> later for better portability.... */
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39
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40 /* plugins management */
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41
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42 /* List of extensions to load, from the configuration parsing */
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43 struct fd_ext_info {
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44 struct fd_list chain; /* link in the list */
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45 char *filename; /* extension filename. must be a dynamic library with fd_ext_init symbol. */
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46 char *conffile; /* optional configuration file name for the extension */
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47 void *handler; /* object returned by dlopen() */
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48 const char **depends; /* names of the other extensions this one depends on (if provided) */
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49 char *ext_name; /* points to the extension name, either inside depends, or basename(filename) */
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50 int free_ext_name; /* must be freed if it was malloc'd */
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51 void (*fini)(void); /* optional address of the fd_ext_fini callback */
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52 };
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53
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54 /* list of extensions */
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55 static struct fd_list ext_list = FD_LIST_INITIALIZER(ext_list);
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56
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57 /* Add new extension */
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58 int fd_ext_add( char * filename, char * conffile )
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59 {
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60 struct fd_ext_info * new;
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61
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62 TRACE_ENTRY("%p %p", filename, conffile);
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63
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64 /* Check the filename is valid */
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65 CHECK_PARAMS( filename );
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66
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67 /* Create a new object in the list */
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68 CHECK_MALLOC( new = malloc( sizeof(struct fd_ext_info) ) );
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69 memset(new, 0, sizeof(struct fd_ext_info));
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70 fd_list_init(&new->chain, NULL);
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71 new->filename = filename;
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72 new->conffile = conffile;
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73 fd_list_insert_before( &ext_list, &new->chain );
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74 TRACE_DEBUG (FULL, "Extension %s added to the list.", filename);
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75 return 0;
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76 }
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77
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78 /* Dump the list */
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79 void fd_ext_dump(void)
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80 {
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81 struct fd_list * li;
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82
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83 fd_log_debug("Dumping extensions list :\n");
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84
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85 for (li = ext_list.next; li != &ext_list; li = li->next)
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86 {
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87 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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88 fd_log_debug(" - '%s'[%s] is %sloaded\n", ext->filename, ext->conffile?:"no conf", ext->handler ? "" : "not ");
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89 }
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90 }
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91
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92 /* Check the dependencies. The object must have been dlopened already. */
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93 static int check_dependencies(struct fd_ext_info * ext)
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94 {
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95 int i = 1;
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96 TRACE_ENTRY( "%p", ext );
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97
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98 /* Attempt to resolve the dependency array */
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99 ext->depends = dlsym( ext->handler, "fd_ext_depends" );
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100 if (!ext->depends) {
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101 /* Duplicate the filename */
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102 char * tmp = strdup(ext->filename);
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103 ext->ext_name = strdup(basename(tmp));
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104 free(tmp);
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105 ext->free_ext_name = 1;
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106 TRACE_DEBUG(FULL, "Old extension's [%s] API: missing dependencies (ignored)", ext->ext_name);
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107 return 0;
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108 }
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109
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110 ext->ext_name = (char *)ext->depends[0];
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111
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112 TRACE_DEBUG(FULL, "Checking dependencies for '%s'...", ext->ext_name);
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113
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114 while (ext->depends[i]) {
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115 struct fd_list * li;
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116 for (li = ext_list.next; li != &ext->chain; li = li->next)
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117 {
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118 struct fd_ext_info * e = (struct fd_ext_info *)li;
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119 if (!strcasecmp(e->ext_name, ext->depends[i])) {
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120 /* the dependency was already loaded */
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121 break;
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122 }
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123 }
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124
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125 if (li == &ext->chain) {
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126 /* the dependency was not found */
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127 TRACE_DEBUG(NONE, "Error: extension [%s] depends on [%s] which was not loaded first.\nPlease fix your configuration file.",
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128 ext->ext_name, ext->depends[i]);
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129 return ESRCH;
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130 }
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131
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132 i++;
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133 }
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134
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135 /* All dependencies resolved successfully */
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136 return 0;
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137 }
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138
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139 /* Load all extensions in the list */
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140 int fd_ext_load()
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141 {
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142 int ret;
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143 int (*fd_ext_init)(int, int, char *) = NULL;
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144 struct fd_list * li;
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145
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146 TRACE_ENTRY();
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147
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148 /* Loop on all extensions */
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149 for (li = ext_list.next; li != &ext_list; li = li->next)
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150 {
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151 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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152 TRACE_DEBUG (INFO, "Loading : %s", ext->filename);
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153
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154 /* Load the extension */
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155 #ifndef DEBUG
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156 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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157 #else /* DEBUG */
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158 /* We resolve symbols immediatly so it's easier to find problems in ABI */
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159 ext->handler = dlopen(ext->filename, RTLD_NOW | RTLD_GLOBAL);
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160 #endif /* DEBUG */
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161 if (ext->handler == NULL) {
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162 /* An error occured */
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163 TRACE_DEBUG( NONE, "Loading of extension %s failed:\n %s", ext->filename, dlerror());
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164 #ifdef DEBUG
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165 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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166 if (ext->handler) {
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167 if (!check_dependencies(ext)) {
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168 TRACE_DEBUG( NONE, "In addition, all declared dependencies are satisfied (Internal Error!)\n");
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169 }
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170 }
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171 #endif /* DEBUG */
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172 return EINVAL;
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173 }
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174
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175 /* Check if declared dependencies are satisfied. */
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176 CHECK_FCT( check_dependencies(ext) );
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177
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178 /* Resolve the entry point of the extension */
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179 fd_ext_init = ( int (*) (int, int, char *) )dlsym( ext->handler, "fd_ext_init" );
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180
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181 if (fd_ext_init == NULL) {
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182 /* An error occured */
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183 TRACE_DEBUG( NONE, "Unable to resolve symbol 'fd_ext_init' for extension %s:\n %s\n", ext->filename, dlerror());
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184 return EINVAL;
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185 }
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186
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187 /* Resolve the exit point of the extension, which is optional for extensions */
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188 ext->fini = ( void (*) (void) )dlsym( ext->handler, "fd_ext_fini" );
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189
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190 if (ext->fini == NULL) {
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191 /* Not provided */
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192 TRACE_DEBUG (FULL, "Extension [%s] has no fd_ext_fini function.", ext->filename);
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193 } else {
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194 /* Provided */
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195 TRACE_DEBUG (FULL, "Extension [%s] fd_ext_fini has been resolved successfully.", ext->filename);
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196 }
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197
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198 /* Now call the entry point to initialize the extension */
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199 ret = (*fd_ext_init)( FD_PROJECT_VERSION_MAJOR, FD_PROJECT_VERSION_MINOR, ext->conffile );
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200 if (ret != 0) {
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201 /* The extension was unable to load cleanly */
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202 TRACE_DEBUG( NONE, "Extension %s returned an error during initialization: %s\n", ext->filename, strerror(ret));
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203 return ret;
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204 }
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205
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206 /* Proceed to the next extension */
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207 }
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208
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209 TRACE_DEBUG (INFO, "All extensions loaded.");
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210
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211 /* We have finished. */
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212 return 0;
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213 }
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214
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215 /* Now unload the extensions and free the memory */
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216 int fd_ext_term( void )
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217 {
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218 TRACE_ENTRY();
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219
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220 /* Loop on all extensions, in FIFO order */
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221 while (!FD_IS_LIST_EMPTY(&ext_list))
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222 {
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223 struct fd_list * li = ext_list.next;
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224 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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225
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226 /* Unlink this element from the list */
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227 fd_list_unlink(li);
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228
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229 /* Call the exit point of the extension, if it was resolved */
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230 if (ext->fini != NULL) {
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231 TRACE_DEBUG (FULL, "Calling [%s]->fd_ext_fini function.", ext->ext_name ?: ext->filename);
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232 (*ext->fini)();
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233 }
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234
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235 #ifndef SKIP_DLCLOSE
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236 /* Now unload the extension */
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237 if (ext->handler) {
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238 TRACE_DEBUG (FULL, "Unloading %s", ext->ext_name ?: ext->filename);
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239 if ( dlclose(ext->handler) != 0 ) {
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240 TRACE_DEBUG (INFO, "Unloading [%s] failed : %s\n", ext->ext_name ?: ext->filename, dlerror());
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241 }
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242 }
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243 #endif /* SKIP_DLCLOSE */
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244
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245 /* Free the object and continue */
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246 if (ext->free_ext_name)
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247 free(ext->ext_name);
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248 free(ext->filename);
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249 free(ext->conffile);
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250 free(ext);
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251 }
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252
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253 /* We always return 0 since we would not handle an error anyway... */
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254 return 0;
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255 }
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256
"Welcome to our mercurial repository"