Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/mempool-system-clean.c @ 9354:687ac828b964 HEAD

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lib-index: modseqs weren't tracked properly within session when changes were done.
author Timo Sirainen <tss@iki.fi>
date Tue, 01 Sep 2009 13:05:03 -0400
parents d6fcb6d050ba
children 00cd9aacd03c
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rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2007-2009 Dovecot authors, see the included COPYING file */
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2
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3 /* @UNSAFE: whole file */
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4
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5 #include "lib.h"
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6 #include "safe-memset.h"
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7 #include "mempool.h"
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8
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9 #include <stdlib.h>
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10 #ifndef HAVE_MALLOC_USABLE_SIZE
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11 /* no extra includes needed */
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12 #elif defined (HAVE_MALLOC_NP_H)
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13 # include <malloc_np.h> /* FreeBSD */
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14 #elif defined (HAVE_MALLOC_H)
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15 # include <malloc.h> /* Linux */
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16 #endif
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17
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18 #ifdef HAVE_GC_GC_H
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19 # include <gc/gc.h>
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20 #elif defined (HAVE_GC_H)
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21 # include <gc.h>
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22 #endif
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23
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24 /* use the maximum of required memory alignment and sizeof(void *)
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25 (sizeof(size_t) is assumed to be same. it always is.) */
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26 #if MEM_ALIGN_SIZE > SIZEOF_VOID_P
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27 # define EXTRA_SIZE_SPACE MEM_ALIGN_SIZE
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28 #else
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29 # define EXTRA_SIZE_SPACE SIZEOF_VOID_P
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30 #endif
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31
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32 /* FIXME: Disabled for now, broken with Valgrind and HP-UX. */
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33 #undef HAVE_MALLOC_USABLE_SIZE
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34
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35 static const char *pool_system_clean_get_name(pool_t pool);
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36 static void pool_system_clean_ref(pool_t pool);
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37 static void pool_system_clean_unref(pool_t *pool);
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38 static void *pool_system_clean_malloc(pool_t pool, size_t size);
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39 static void pool_system_clean_free(pool_t pool, void *mem);
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40 static void *pool_system_clean_realloc(pool_t pool, void *mem,
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41 size_t old_size, size_t new_size);
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42 static void pool_system_clean_clear(pool_t pool);
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43 static size_t pool_system_clean_get_max_easy_alloc_size(pool_t pool);
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44
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45 static struct pool_vfuncs static_system_clean_pool_vfuncs = {
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46 pool_system_clean_get_name,
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47
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48 pool_system_clean_ref,
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49 pool_system_clean_unref,
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50
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51 pool_system_clean_malloc,
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52 pool_system_clean_free,
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53
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54 pool_system_clean_realloc,
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55
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56 pool_system_clean_clear,
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57 pool_system_clean_get_max_easy_alloc_size
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58 };
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59
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60 static struct pool static_system_clean_pool = {
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61 MEMBER(v) &static_system_clean_pool_vfuncs,
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62
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63 MEMBER(alloconly_pool) FALSE,
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64 MEMBER(datastack_pool) FALSE
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65 };
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66
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67 pool_t system_clean_pool = &static_system_clean_pool;
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68
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69 static const char *pool_system_clean_get_name(pool_t pool ATTR_UNUSED)
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70 {
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71 return "system clean";
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72 }
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73
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74 static void pool_system_clean_ref(pool_t pool ATTR_UNUSED)
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75 {
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76 }
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77
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78 static void pool_system_clean_unref(pool_t *pool ATTR_UNUSED)
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79 {
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80 }
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81
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82 static size_t mem_get_size(void *mem)
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83 {
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84 #ifdef USE_GC
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85 return GC_size(mem);
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86 #elif defined(HAVE_MALLOC_USABLE_SIZE)
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87 return malloc_usable_size(mem);
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88 #else
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89 return *((size_t *)PTR_OFFSET(mem, -EXTRA_SIZE_SPACE));
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90 #endif
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91 }
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92
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93 static void *pool_system_clean_malloc(pool_t pool ATTR_UNUSED, size_t size)
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94 {
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95 void *mem;
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96
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97 if (unlikely(size == 0 || size > SSIZE_T_MAX))
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98 i_panic("Trying to allocate %"PRIuSIZE_T" bytes", size);
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99
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100 #ifdef USE_GC
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101 mem = GC_malloc(size);
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102 #else
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103 #ifndef HAVE_MALLOC_USABLE_SIZE
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104 size += EXTRA_SIZE_SPACE;
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105 #endif
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106 mem = calloc(size, 1);
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107 #endif
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108 if (unlikely(mem == NULL)) {
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109 i_fatal_status(FATAL_OUTOFMEM, "pool_system_malloc(%"PRIuSIZE_T
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110 "): Out of memory", size);
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111 }
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112 #if !defined(USE_GC) && !defined(HAVE_MALLOC_USABLE_SIZE)
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113 {
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114 size_t *saved_size = mem;
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115
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116 *saved_size = size - EXTRA_SIZE_SPACE;
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117 mem = PTR_OFFSET(mem, EXTRA_SIZE_SPACE);
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118 }
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119 #endif
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120 return mem;
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121 }
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122
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123 static void pool_system_clean_free(pool_t pool ATTR_UNUSED, void *mem)
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124 {
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125 if (mem != NULL) {
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126 safe_memset(mem, 0, mem_get_size(mem));
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127 #ifndef USE_GC
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128 #ifndef HAVE_MALLOC_USABLE_SIZE
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129 mem = PTR_OFFSET(mem, -EXTRA_SIZE_SPACE);
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130 #endif
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131 free(mem);
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132 #endif
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133 }
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134 }
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135
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136 static void *pool_system_clean_realloc(pool_t pool ATTR_UNUSED, void *mem,
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137 size_t old_size, size_t new_size)
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138 {
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139 void *new_mem;
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140 size_t old_alloc_size;
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141
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142 if (unlikely(new_size == 0 || new_size > SSIZE_T_MAX))
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143 i_panic("Trying to allocate %"PRIuSIZE_T" bytes", new_size);
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144
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145 new_mem = pool_system_clean_malloc(pool, new_size);
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146 if (mem != NULL) {
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147 #if !defined(USE_GC) && defined(HAVE_MALLOC_USABLE_SIZE)
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148 i_assert(old_size == (size_t)-1 ||
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149 old_size <= malloc_usable_size(mem));
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150 #endif
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151 old_alloc_size = mem_get_size(mem);
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152 memcpy(new_mem, mem, I_MIN(old_alloc_size, new_size));
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153
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154 if (old_size < new_size) {
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155 /* clear new data */
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156 memset((char *)new_mem + old_size, 0,
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157 new_size - old_size);
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158 }
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159 pool_system_clean_free(pool, mem);
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160 }
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161
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162 return new_mem;
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163 }
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164
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165 static void ATTR_NORETURN
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166 pool_system_clean_clear(pool_t pool ATTR_UNUSED)
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167 {
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168 i_panic("pool_system_clean_clear() must not be called");
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169 }
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170
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171 static size_t
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172 pool_system_clean_get_max_easy_alloc_size(pool_t pool ATTR_UNUSED)
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173 {
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174 return 0;
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175 }