1 | /* Support for reading /etc/ld.so.cache files written by Linux ldconfig. |
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2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | #include <stdint.h> |
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21 | |
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22 | #ifndef _DL_CACHE_DEFAULT_ID |
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23 | # define _DL_CACHE_DEFAULT_ID 3 |
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24 | #endif |
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25 | |
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26 | #ifndef _dl_cache_check_flags |
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27 | # define _dl_cache_check_flags(flags) \ |
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28 | ((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID) |
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29 | #endif |
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30 | |
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31 | #ifndef SYSCONFDIR |
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32 | # define SYSCONFDIR "/etc" |
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33 | #endif |
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34 | |
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35 | #ifndef LD_SO_CACHE |
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36 | # define LD_SO_CACHE SYSCONFDIR "/ld.so.cache" |
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37 | #endif |
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38 | |
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39 | #define CACHEMAGIC "ld.so-1.7.0" |
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40 | |
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41 | /* libc5 and glibc 2.0/2.1 use the same format. For glibc 2.2 another |
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42 | format has been added in a compatible way: |
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43 | The beginning of the string table is used for the new table: |
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44 | old_magic |
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45 | nlibs |
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46 | libs[0] |
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47 | ... |
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48 | libs[nlibs-1] |
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49 | pad, new magic needs to be aligned |
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50 | - this is string[0] for the old format |
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51 | new magic - this is string[0] for the new format |
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52 | newnlibs |
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53 | ... |
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54 | newlibs[0] |
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55 | ... |
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56 | newlibs[newnlibs-1] |
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57 | string 1 |
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58 | string 2 |
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59 | ... |
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60 | */ |
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61 | struct file_entry |
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62 | { |
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63 | int flags; /* This is 1 for an ELF library. */ |
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64 | unsigned int key, value; /* String table indices. */ |
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65 | }; |
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66 | |
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67 | struct cache_file |
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68 | { |
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69 | char magic[sizeof CACHEMAGIC - 1]; |
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70 | unsigned int nlibs; |
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71 | struct file_entry libs[0]; |
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72 | }; |
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73 | |
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74 | #define CACHEMAGIC_NEW "glibc-ld.so.cache" |
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75 | #define CACHE_VERSION "1.1" |
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76 | #define CACHEMAGIC_VERSION_NEW CACHEMAGIC_NEW CACHE_VERSION |
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77 | |
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78 | |
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79 | struct file_entry_new |
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80 | { |
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81 | int32_t flags; /* This is 1 for an ELF library. */ |
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82 | uint32_t key, value; /* String table indices. */ |
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83 | uint32_t osversion; /* Required OS version. */ |
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84 | uint64_t hwcap; /* Hwcap entry. */ |
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85 | }; |
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86 | |
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87 | struct cache_file_new |
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88 | { |
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89 | char magic[sizeof CACHEMAGIC_NEW - 1]; |
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90 | char version[sizeof CACHE_VERSION - 1]; |
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91 | uint32_t nlibs; /* Number of entries. */ |
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92 | uint32_t len_strings; /* Size of string table. */ |
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93 | uint32_t unused[5]; /* Leave space for future extensions |
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94 | and align to 8 byte boundary. */ |
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95 | struct file_entry_new libs[0]; /* Entries describing libraries. */ |
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96 | /* After this the string table of size len_strings is found. */ |
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97 | }; |
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98 | |
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99 | /* Used to align cache_file_new. */ |
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100 | #define ALIGN_CACHE(addr) \ |
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101 | (((addr) + __alignof__ (struct cache_file_new) -1) \ |
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102 | & (~(__alignof__ (struct cache_file_new) - 1))) |
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103 | |
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104 | static int |
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105 | _dl_cache_libcmp (const char *p1, const char *p2) |
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106 | { |
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107 | while (*p1 != '\0') |
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108 | { |
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109 | if (*p1 >= '0' && *p1 <= '9') |
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110 | { |
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111 | if (*p2 >= '0' && *p2 <= '9') |
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112 | { |
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113 | /* Must compare this numerically. */ |
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114 | int val1; |
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115 | int val2; |
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116 | |
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117 | val1 = *p1++ - '0'; |
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118 | val2 = *p2++ - '0'; |
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119 | while (*p1 >= '0' && *p1 <= '9') |
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120 | val1 = val1 * 10 + *p1++ - '0'; |
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121 | while (*p2 >= '0' && *p2 <= '9') |
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122 | val2 = val2 * 10 + *p2++ - '0'; |
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123 | if (val1 != val2) |
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124 | return val1 - val2; |
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125 | } |
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126 | else |
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127 | return 1; |
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128 | } |
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129 | else if (*p2 >= '0' && *p2 <= '9') |
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130 | return -1; |
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131 | else if (*p1 != *p2) |
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132 | return *p1 - *p2; |
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133 | else |
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134 | { |
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135 | ++p1; |
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136 | ++p2; |
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137 | } |
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138 | } |
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139 | return *p1 - *p2; |
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140 | } |
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