Mon, 01 Jan 2018 19:53:36 +0100
adds xattr lib and tag support
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adds xattr lib and tag support
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1 | #define _GNU_SOURCE |
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2 | |
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3 | #include <stdio.h> |
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4 | #include <stdlib.h> |
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5 | |
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6 | #include "libxattr.h" |
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7 | |
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8 | #include <errno.h> |
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9 | #include <sys/types.h> |
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10 | |
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11 | #include <string.h> |
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12 | |
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13 | #define LIST_BUF_LEN 1024 |
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14 | #define LIST_ARRAY_LEN 8 |
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15 | #define ATTR_BUF_LEN 1024 |
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16 | |
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17 | #define ARRAY_ADD(array, pos, len, obj) if(pos >= len) { \ |
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18 | len *= 2; \ |
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19 | array = realloc(array, len * sizeof(char*)); \ |
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20 | } \ |
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21 | array[pos] = obj; \ |
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22 | pos++; |
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23 | |
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24 | |
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25 | #ifdef __linux__ |
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26 | #define XATTR_SUPPORTED |
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27 | #include <sys/xattr.h> |
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28 | |
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29 | static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) { |
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30 | size_t arraylen = LIST_ARRAY_LEN; |
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31 | size_t arraypos = 0; |
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32 | char **array = malloc(LIST_ARRAY_LEN * sizeof(char*)); |
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33 | |
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34 | char *begin = buf; |
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35 | char *name = NULL; |
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36 | for(int i=0;i<length;i++) { |
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37 | if(!name && buf[i] == '.') { |
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38 | int nslen = (buf+i-begin); |
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39 | //printf("%.*s\n", nslen, begin); |
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40 | name = buf + i + 1; |
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41 | } |
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42 | if(buf[i] == '\0') { |
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43 | char *attrname = strdup(name); |
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44 | ARRAY_ADD(array, arraypos, arraylen, attrname); |
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45 | begin = buf + i + 1; |
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46 | name = 0; |
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47 | } |
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48 | } |
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49 | |
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50 | if(arraypos == 0) { |
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51 | free(array); |
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52 | array = NULL; |
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53 | } |
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54 | |
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55 | *nelm = arraypos; |
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56 | return array; |
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57 | } |
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58 | |
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59 | char ** xattr_list(const char *path, ssize_t *nelm) { |
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60 | char *list = malloc(LIST_BUF_LEN); |
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61 | ssize_t len = listxattr(path, list, LIST_BUF_LEN); |
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62 | if(len == -1) { |
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63 | switch(errno) { |
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64 | case ERANGE: { |
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65 | // buffer too, get size of attribute list |
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66 | ssize_t newlen = listxattr(path, NULL, 0); |
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67 | if(newlen > 0) { |
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68 | // second try |
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69 | list = realloc(list, newlen); |
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70 | len = listxattr(path, list, newlen); |
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71 | if(len != -1) { |
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72 | // this time it worked |
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73 | break; |
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74 | } |
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75 | } |
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76 | } |
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77 | default: { |
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78 | free(list); |
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79 | *nelm = -1; |
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80 | return NULL; |
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81 | } |
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82 | } |
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83 | } |
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84 | |
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85 | char **ret = parse_xattrlist(list, len, nelm); |
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86 | free(list); |
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87 | return ret; |
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88 | } |
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89 | |
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90 | static char* name2nsname(const char *name) { |
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91 | // add the 'user' namespace to the name |
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92 | size_t namelen = strlen(name); |
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93 | char *attrname = malloc(8 + namelen); |
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94 | memcpy(attrname, "user.", 5); |
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95 | memcpy(attrname+5, name, namelen + 1); |
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96 | return attrname; |
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97 | } |
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98 | |
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99 | char * xattr_get(const char *path, const char *attr, ssize_t *len) { |
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100 | char *attrname = name2nsname(attr); |
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101 | |
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102 | char *buf = malloc(ATTR_BUF_LEN); |
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103 | ssize_t vlen = getxattr(path, attrname, buf, ATTR_BUF_LEN); |
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104 | if(vlen < 0) { |
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105 | switch(errno) { |
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106 | case ERANGE: { |
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107 | ssize_t attrlen = getxattr(path, attrname, NULL, 0); |
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108 | if(attrlen > 0) { |
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109 | free(buf); |
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110 | buf = malloc(attrlen); |
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111 | vlen = getxattr(path, attrname, buf, attrlen); |
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112 | if(vlen > 0) { |
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113 | break; |
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114 | } |
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115 | } |
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116 | } |
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117 | default: { |
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118 | *len = -1; |
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119 | free(buf); |
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120 | free(attrname); |
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121 | return NULL; |
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122 | } |
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123 | } |
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124 | } |
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125 | |
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126 | free(attrname); |
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127 | *len = vlen; |
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128 | return buf; |
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129 | } |
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130 | |
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131 | int xattr_set(const char *path, const char *name, const void *value, size_t len) { |
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132 | char *attrname = name2nsname(name); |
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133 | int ret = setxattr(path, attrname, value, len, 0); |
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134 | free(attrname); |
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135 | return ret; |
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136 | } |
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137 | |
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138 | #endif /* Linux */ |
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139 | |
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140 | #ifdef __APPLE__ |
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141 | #define XATTR_SUPPORTED |
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142 | #include <sys/xattr.h> |
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143 | |
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144 | static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) { |
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145 | size_t arraylen = LIST_ARRAY_LEN; |
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146 | size_t arraypos = 0; |
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147 | char **array = malloc(LIST_ARRAY_LEN * sizeof(char*)); |
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148 | |
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149 | char *name = buf; |
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150 | for(int i=0;i<length;i++) { |
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151 | if(buf[i] == '\0') { |
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152 | char *attrname = strdup(name); |
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153 | ARRAY_ADD(array, arraypos, arraylen, attrname); |
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154 | name = buf + i + 1; |
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155 | } |
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156 | } |
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157 | |
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158 | if(arraypos == 0) { |
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159 | free(array); |
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160 | array = NULL; |
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161 | } |
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162 | |
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163 | *nelm = arraypos; |
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164 | return array; |
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165 | } |
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166 | |
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167 | char ** xattr_list(const char *path, ssize_t *nelm) { |
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168 | char *list = malloc(LIST_BUF_LEN); |
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169 | ssize_t len = listxattr(path, list, LIST_BUF_LEN, 0); |
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170 | if(len == -1) { |
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171 | switch(errno) { |
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172 | case ERANGE: { |
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173 | // buffer too, get size of attribute list |
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174 | ssize_t newlen = listxattr(path, NULL, 0, 0); |
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175 | if(newlen > 0) { |
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176 | // second try |
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177 | list = realloc(list, newlen); |
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178 | len = listxattr(path, list, newlen, 0); |
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179 | if(len != -1) { |
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180 | // this time it worked |
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181 | break; |
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182 | } |
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183 | } |
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184 | } |
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185 | default: { |
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186 | free(list); |
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187 | *nelm = -1; |
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188 | return NULL; |
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189 | } |
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190 | } |
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191 | } |
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192 | |
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193 | char **ret = parse_xattrlist(list, len, nelm); |
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194 | free(list); |
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195 | return ret; |
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196 | } |
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197 | |
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198 | char * xattr_get(const char *path, const char *attr, ssize_t *len) { |
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199 | // get attribute length |
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200 | ssize_t attrlen = getxattr(path, attr, NULL, 0, 0, 0); |
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201 | if(attrlen < 0) { |
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202 | *len = -1; |
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203 | return NULL; |
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204 | } |
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205 | |
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206 | char *buf = malloc(attrlen); |
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207 | ssize_t vlen = getxattr(path, attr, buf, attrlen, 0, 0); |
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208 | if(vlen < 0) { |
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209 | *len = -1; |
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210 | free(buf); |
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211 | return NULL; |
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212 | } |
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213 | |
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214 | *len = vlen; |
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215 | return buf; |
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216 | } |
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217 | |
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218 | int xattr_set(const char *path, const char *name, const void *value, size_t len) { |
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219 | int ret = setxattr(path, name, value, len, 0, 0); |
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220 | return ret; |
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221 | } |
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222 | |
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223 | #endif /* Apple */ |
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224 | |
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225 | #ifdef __sun |
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226 | #define XATTR_SUPPORTED |
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227 | #include <unistd.h> |
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228 | #include <sys/types.h> |
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229 | #include <sys/stat.h> |
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230 | #include <dirent.h> |
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231 | #include <fcntl.h> |
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232 | |
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233 | static int open_attrfile(const char *path, const char *attr, int oflag) { |
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234 | int file = open(path, O_RDONLY); |
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235 | if(file == -1) { |
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236 | return -1; |
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237 | } |
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238 | |
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239 | int attrfile = openat(file, attr, oflag, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); |
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240 | close(file); |
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241 | return attrfile; |
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242 | } |
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243 | |
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244 | char ** xattr_list(const char *path, ssize_t *nelm) { |
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245 | *nelm = -1; |
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246 | |
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247 | int attrdir = open_attrfile(path, ".", O_RDONLY|O_XATTR); |
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248 | if(attrdir == -1) { |
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249 | return NULL; |
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250 | } |
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251 | |
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252 | DIR *dir = fdopendir(attrdir); |
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253 | if(!dir) { |
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254 | close(attrdir); |
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255 | return NULL; |
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256 | } |
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257 | |
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258 | size_t arraylen = LIST_ARRAY_LEN; |
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259 | size_t arraypos = 0; |
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260 | char **array = malloc(LIST_ARRAY_LEN * sizeof(char*)); |
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261 | |
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262 | struct dirent *ent; |
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263 | while((ent = readdir(dir)) != NULL) { |
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264 | if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "SUNWattr_ro") || !strcmp(ent->d_name, "SUNWattr_rw")) { |
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265 | continue; |
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266 | } |
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267 | char *name = strdup(ent->d_name); |
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268 | ARRAY_ADD(array, arraypos, arraylen, name); |
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269 | } |
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270 | closedir(dir); |
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271 | |
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272 | *nelm = arraypos; |
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273 | return array; |
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274 | } |
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275 | |
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276 | char * xattr_get(const char *path, const char *attr, ssize_t *len) { |
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277 | *len = -1; |
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278 | |
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279 | int attrfile = open_attrfile(path, attr, O_RDONLY|O_XATTR); |
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280 | if(attrfile == -1) { |
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281 | return NULL; |
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282 | } |
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283 | |
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284 | struct stat s; |
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285 | if(fstat(attrfile, &s)) { |
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286 | close(attrfile); |
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287 | return NULL; |
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288 | } |
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289 | |
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290 | size_t bufsize = (size_t)s.st_size; |
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291 | char *buf = malloc(bufsize); |
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292 | |
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293 | char *b = buf; |
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294 | size_t cur = 0; |
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295 | while(cur < bufsize) { |
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296 | ssize_t r = read(attrfile, buf + cur, bufsize - cur); |
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297 | if(r <= 0) { |
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298 | break; |
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299 | } |
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300 | cur += r; |
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301 | } |
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302 | |
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303 | close(attrfile); |
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304 | if(cur != bufsize) { |
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305 | free(buf); |
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306 | return NULL; |
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307 | } |
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308 | |
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309 | *len = (ssize_t)bufsize; |
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310 | return buf; |
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311 | } |
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312 | |
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313 | int xattr_set(const char *path, const char *name, const void *value, size_t len) { |
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314 | int attrfile = open_attrfile(path, name, O_CREAT|O_WRONLY|O_XATTR); |
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315 | if(attrfile == -1) { |
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316 | return -1; |
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317 | } |
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318 | |
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319 | const char *p = value; |
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320 | size_t remaining = len; |
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321 | while(remaining > 0) { |
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322 | ssize_t w = write(attrfile, p, remaining); |
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323 | if(w <= 0) { |
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324 | break; |
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325 | } |
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326 | p += w; |
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327 | remaining -= w; |
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328 | } |
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329 | |
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330 | close(attrfile); |
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331 | |
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332 | return remaining > 0 ? -1 : 0; |
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333 | } |
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334 | |
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335 | #endif /* Sun */ |
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336 | |
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337 | |
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338 | #ifdef __FreeBSD__ |
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339 | #define XATTR_SUPPORTED |
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340 | |
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341 | #include <sys/types.h> |
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342 | #include <sys/extattr.h> |
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343 | |
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344 | static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) { |
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345 | size_t arraylen = LIST_ARRAY_LEN; |
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346 | size_t arraypos = 0; |
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347 | char **array = malloc(LIST_ARRAY_LEN * sizeof(char*)); |
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348 | |
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349 | char *name = buf; |
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350 | for(int i=0;i<length;i++) { |
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351 | char namelen = buf[i]; |
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352 | char *name = buf + i + 1; |
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353 | char *attrname = malloc(namelen + 1); |
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354 | memcpy(attrname, name, namelen); |
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355 | attrname[namelen] = 0; |
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356 | ARRAY_ADD(array, arraypos, arraylen, attrname); |
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357 | i += namelen; |
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358 | } |
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359 | |
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360 | if(arraypos == 0) { |
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361 | free(array); |
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362 | array = NULL; |
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363 | } |
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364 | |
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365 | *nelm = arraypos; |
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366 | return array; |
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367 | } |
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368 | |
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369 | char ** xattr_list(const char *path, ssize_t *nelm) { |
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370 | *nelm = -1; |
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371 | ssize_t lslen = extattr_list_file(path, EXTATTR_NAMESPACE_USER, NULL, 0); |
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372 | if(lslen <= 0) { |
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373 | if(lslen == 0) { |
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374 | *nelm = 0; |
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375 | } |
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376 | return NULL; |
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377 | } |
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378 | |
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379 | char *list = malloc(lslen); |
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380 | ssize_t len = extattr_list_file(path, EXTATTR_NAMESPACE_USER, list, lslen); |
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381 | if(len == -1) { |
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382 | free(list); |
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383 | return NULL; |
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384 | } |
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385 | |
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386 | char **ret = parse_xattrlist(list, len, nelm); |
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387 | free(list); |
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388 | return ret; |
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389 | } |
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390 | |
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391 | char * xattr_get(const char *path, const char *attr, ssize_t *len) { |
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392 | // get attribute length |
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393 | ssize_t attrlen = extattr_get_file(path, EXTATTR_NAMESPACE_USER, attr, NULL, 0); |
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394 | if(attrlen < 0) { |
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395 | *len = -1; |
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396 | return NULL; |
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397 | } |
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398 | |
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399 | char *buf = malloc(attrlen); |
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400 | ssize_t vlen = extattr_get_file(path, EXTATTR_NAMESPACE_USER, attr, buf, attrlen); |
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401 | if(vlen < 0) { |
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402 | *len = -1; |
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403 | free(buf); |
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404 | return NULL; |
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405 | } |
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406 | |
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407 | *len = vlen; |
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408 | return buf; |
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409 | } |
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410 | |
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411 | int xattr_set(const char *path, const char *name, const void *value, size_t len) { |
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412 | int ret = extattr_set_file(path, EXTATTR_NAMESPACE_USER, name, value, len); |
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413 | return ret; |
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414 | } |
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415 | |
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416 | #endif /* FreeBSD */ |
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417 | |
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418 | |
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419 | #ifndef XATTR_SUPPORTED |
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420 | |
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421 | char ** xattr_list(const char *path, ssize_t *nelm) { |
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422 | *nelm = -1; |
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423 | return NULL; |
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424 | } |
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425 | |
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426 | char * xattr_get(const char *path, const char *attr, ssize_t *len) { |
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427 | *len = -1; |
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428 | return NULL; |
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429 | } |
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430 | |
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431 | int xattr_set(const char *path, const char *name, const void *value, size_t len) { |
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432 | return -1; |
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433 | } |
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434 | |
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435 | #endif /* unsupported platform */ |
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436 | |
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437 | void xattr_free_list(char **attrnames, ssize_t nelm) { |
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438 | if(attrnames) { |
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439 | for(int i=0;i<nelm;i++) { |
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440 | free(attrnames[i]); |
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441 | } |
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442 | free(attrnames); |
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443 | } |
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444 | } |