Mercurial > hg > toybox
annotate toys/pending/mdev.c @ 1639:856b544f8fce draft
strncpy(optptr, hname, strlen(hname)) is really just strcpy().
author | Rob Landley <rob@landley.net> |
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date | Thu, 01 Jan 2015 16:49:55 -0600 |
parents | 63db77909fc8 |
children | da1296acc73e |
rev | line source |
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1 /* mdev.c - Populate /dev directory and handle hotplug events |
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2 * |
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3 * Copyright 2005, 2008 Rob Landley <rob@landley.net> |
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4 * Copyright 2005 Frank Sorenson <frank@tuxrocks.com> |
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5 |
257 | 6 USE_MDEV(NEWTOY(mdev, "s", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_UMASK)) |
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7 |
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8 config MDEV |
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9 bool "mdev" |
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10 default n |
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11 help |
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12 usage: mdev [-s] |
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13 |
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14 Create devices in /dev using information from /sys. |
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15 |
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16 -s Scan all entries in /sys to populate /dev. |
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17 |
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18 config MDEV_CONF |
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19 bool "Configuration file for mdev" |
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20 default y |
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21 depends on MDEV |
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22 help |
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23 The mdev config file (/etc/mdev.conf) contains lines that look like: |
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24 hd[a-z][0-9]* 0:3 660 |
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25 |
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26 Each line must contain three whitespace separated fields. The first |
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27 field is a regular expression matching one or more device names, and |
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28 the second and third fields are uid:gid and file permissions for |
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29 matching devies. |
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30 */ |
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31 |
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32 #include "toys.h" |
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33 |
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34 // todo, open() block devices to trigger partition scanning. |
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35 |
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36 // mknod in /dev based on a path like "/sys/block/hda/hda1" |
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37 static void make_device(char *path) |
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38 { |
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39 char *device_name, *s, *temp; |
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40 int major, minor, type, len, fd; |
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41 int mode = 0660; |
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42 uid_t uid = 0; |
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43 gid_t gid = 0; |
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44 |
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45 // Try to read major/minor string |
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46 |
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47 temp = strrchr(path, '/'); |
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48 fd = open(path, O_RDONLY); |
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49 *temp=0; |
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50 temp = toybuf; |
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51 len = read(fd, temp, 64); |
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52 close(fd); |
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53 if (len<1) return; |
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54 temp[len] = 0; |
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55 |
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56 // Determine device name, type, major and minor |
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57 |
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58 device_name = strrchr(path, '/') + 1; |
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59 type = path[5]=='c' ? S_IFCHR : S_IFBLK; |
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60 major = minor = 0; |
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61 sscanf(temp, "%u:%u", &major, &minor); |
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62 |
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63 // If we have a config file, look up permissions for this device |
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64 |
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65 if (CFG_MDEV_CONF) { |
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66 char *conf, *pos, *end; |
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67 |
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68 // mmap the config file |
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69 if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) { |
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70 len = fdlength(fd); |
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71 conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0); |
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72 if (conf) { |
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73 int line = 0; |
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74 |
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75 // Loop through lines in mmaped file |
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76 for (pos = conf; pos-conf<len;) { |
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77 int field; |
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78 char *end2; |
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79 |
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80 line++; |
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81 // find end of this line |
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82 for(end = pos; end-conf<len && *end!='\n'; end++); |
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83 |
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84 // Three fields: regex, uid:gid, mode |
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85 for (field = 3; field; field--) { |
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86 // Skip whitespace |
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87 while (pos<end && isspace(*pos)) pos++; |
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88 if (pos==end || *pos=='#') break; |
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89 for (end2 = pos; |
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90 end2<end && !isspace(*end2) && *end2!='#'; end2++); |
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91 switch(field) { |
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92 // Regex to match this device |
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93 case 3: |
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94 { |
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95 char *regex = strndup(pos, end2-pos); |
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96 regex_t match; |
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97 regmatch_t off; |
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98 int result; |
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99 |
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100 // Is this it? |
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101 xregcomp(&match, regex, REG_EXTENDED); |
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102 result=regexec(&match, device_name, 1, &off, 0); |
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103 regfree(&match); |
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104 free(regex); |
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105 |
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106 // If not this device, skip rest of line |
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107 if (result || off.rm_so |
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108 || off.rm_eo!=strlen(device_name)) |
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109 goto end_line; |
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110 |
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111 break; |
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112 } |
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113 // uid:gid |
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114 case 2: |
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115 { |
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116 char *s2; |
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117 |
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118 // Find : |
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119 for(s = pos; s<end2 && *s!=':'; s++); |
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120 if (s==end2) goto end_line; |
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121 |
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122 // Parse UID |
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123 uid = strtoul(pos,&s2,10); |
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124 if (s!=s2) { |
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125 struct passwd *pass; |
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126 char *str = strndup(pos, s-pos); |
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127 pass = getpwnam(str); |
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128 free(str); |
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129 if (!pass) goto end_line; |
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130 uid = pass->pw_uid; |
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131 } |
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132 s++; |
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133 // parse GID |
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134 gid = strtoul(s,&s2,10); |
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135 if (end2!=s2) { |
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136 struct group *grp; |
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137 char *str = strndup(s, end2-s); |
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138 grp = getgrnam(str); |
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139 free(str); |
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140 if (!grp) goto end_line; |
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141 gid = grp->gr_gid; |
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142 } |
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143 break; |
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144 } |
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145 // mode |
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146 case 1: |
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147 { |
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148 mode = strtoul(pos, &pos, 8); |
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149 if (pos!=end2) goto end_line; |
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150 goto found_device; |
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151 } |
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152 } |
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153 pos=end2; |
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154 } |
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155 end_line: |
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156 // Did everything parse happily? |
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157 if (field && field!=3) error_exit("Bad line %d", line); |
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158 |
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159 // Next line |
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160 pos = ++end; |
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161 } |
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162 found_device: |
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163 munmap(conf, len); |
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164 } |
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165 close(fd); |
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166 } |
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167 } |
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168 |
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169 sprintf(temp, "/dev/%s", device_name); |
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170 if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST) |
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171 perror_exit("mknod %s failed", temp); |
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172 |
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173 if (CFG_MDEV_CONF) mode=chown(temp, uid, gid); |
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174 } |
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175 |
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176 static int callback(struct dirtree *node) |
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177 { |
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178 // Entries in /sys/class/block aren't char devices, so skip 'em. (We'll |
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179 // get block devices out of /sys/block.) |
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180 if(!strcmp(node->name, "block")) return 0; |
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181 |
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182 // Does this directory have a "dev" entry in it? |
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183 // This is path based because the hotplug callbacks are |
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184 if (S_ISDIR(node->st.st_mode) || S_ISLNK(node->st.st_mode)) { |
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185 int len=4; |
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186 char *dev = dirtree_path(node, &len); |
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187 strcpy(dev+len, "/dev"); |
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188 if (!access(dev, R_OK)) make_device(dev); |
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189 free(dev); |
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190 } |
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191 |
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192 // Circa 2.6.25 the entries more than 2 deep are all either redundant |
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193 // (mouse#, event#) or unnamed (every usb_* entry is called "device"). |
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194 |
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195 return (node->parent && node->parent->parent) ? 0 : DIRTREE_RECURSE; |
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196 } |
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197 |
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198 void mdev_main(void) |
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199 { |
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200 // Handle -s |
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201 |
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202 if (toys.optflags) { |
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203 dirtree_read("/sys/class", callback); |
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204 dirtree_read("/sys/block", callback); |
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205 } |
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206 |
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207 // hotplug support goes here |
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208 } |