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annotate third_party/wrk/src/zmalloc.c @ 206:240337164a80

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[Seobeo] SSL should be used for large file as well lol.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 11:41:53 -0800
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
178
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1 /* zmalloc - total amount of allocated memory aware version of malloc()
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2 *
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3 * Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
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4 * All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * * Redistributions of source code must retain the above copyright notice,
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10 * this list of conditions and the following disclaimer.
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11 * * Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 * * Neither the name of Redis nor the names of its contributors may be used
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15 * to endorse or promote products derived from this software without
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16 * specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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28 * POSSIBILITY OF SUCH DAMAGE.
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29 */
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30
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31 #include <stdio.h>
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32 #include <stdlib.h>
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33
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34 /* This function provide us access to the original libc free(). This is useful
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35 * for instance to free results obtained by backtrace_symbols(). We need
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36 * to define this function before including zmalloc.h that may shadow the
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37 * free implementation if we use jemalloc or another non standard allocator. */
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38 void zlibc_free(void *ptr) {
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39 free(ptr);
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40 }
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41
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42 #include <string.h>
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43 #include <pthread.h>
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44 #include "config.h"
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45 #include "zmalloc.h"
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46 #include "atomicvar.h"
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47
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48 #ifdef HAVE_MALLOC_SIZE
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49 #define PREFIX_SIZE (0)
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50 #else
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51 #if defined(__sun) || defined(__sparc) || defined(__sparc__)
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52 #define PREFIX_SIZE (sizeof(long long))
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53 #else
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54 #define PREFIX_SIZE (sizeof(size_t))
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55 #endif
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56 #endif
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57
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58 /* Explicitly override malloc/free etc when using tcmalloc. */
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59 #if defined(USE_TCMALLOC)
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60 #define malloc(size) tc_malloc(size)
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61 #define calloc(count,size) tc_calloc(count,size)
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62 #define realloc(ptr,size) tc_realloc(ptr,size)
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63 #define free(ptr) tc_free(ptr)
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64 #elif defined(USE_JEMALLOC)
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65 #define malloc(size) je_malloc(size)
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66 #define calloc(count,size) je_calloc(count,size)
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67 #define realloc(ptr,size) je_realloc(ptr,size)
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68 #define free(ptr) je_free(ptr)
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69 #define mallocx(size,flags) je_mallocx(size,flags)
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70 #define dallocx(ptr,flags) je_dallocx(ptr,flags)
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71 #endif
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72
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73 #define update_zmalloc_stat_alloc(__n) do { \
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74 size_t _n = (__n); \
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75 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
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76 atomicIncr(used_memory,__n); \
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77 } while(0)
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78
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79 #define update_zmalloc_stat_free(__n) do { \
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80 size_t _n = (__n); \
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81 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
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82 atomicDecr(used_memory,__n); \
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83 } while(0)
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84
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85 static size_t used_memory = 0;
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86 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
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87
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88 static void zmalloc_default_oom(size_t size) {
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89 fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
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90 size);
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91 fflush(stderr);
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92 abort();
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93 }
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94
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95 static void (*zmalloc_oom_handler)(size_t) = zmalloc_default_oom;
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96
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97 void *zmalloc(size_t size) {
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98 void *ptr = malloc(size+PREFIX_SIZE);
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99
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100 if (!ptr) zmalloc_oom_handler(size);
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101 #ifdef HAVE_MALLOC_SIZE
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102 update_zmalloc_stat_alloc(zmalloc_size(ptr));
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103 return ptr;
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104 #else
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105 *((size_t*)ptr) = size;
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106 update_zmalloc_stat_alloc(size+PREFIX_SIZE);
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107 return (char*)ptr+PREFIX_SIZE;
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108 #endif
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109 }
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110
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111 /* Allocation and free functions that bypass the thread cache
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112 * and go straight to the allocator arena bins.
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113 * Currently implemented only for jemalloc. Used for online defragmentation. */
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114 #ifdef HAVE_DEFRAG
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115 void *zmalloc_no_tcache(size_t size) {
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116 void *ptr = mallocx(size+PREFIX_SIZE, MALLOCX_TCACHE_NONE);
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117 if (!ptr) zmalloc_oom_handler(size);
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118 update_zmalloc_stat_alloc(zmalloc_size(ptr));
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119 return ptr;
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120 }
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121
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122 void zfree_no_tcache(void *ptr) {
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123 if (ptr == NULL) return;
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124 update_zmalloc_stat_free(zmalloc_size(ptr));
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125 dallocx(ptr, MALLOCX_TCACHE_NONE);
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126 }
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127 #endif
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128
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parents:
diff changeset
129 void *zcalloc(size_t size) {
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parents:
diff changeset
130 void *ptr = calloc(1, size+PREFIX_SIZE);
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diff changeset
131
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parents:
diff changeset
132 if (!ptr) zmalloc_oom_handler(size);
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parents:
diff changeset
133 #ifdef HAVE_MALLOC_SIZE
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parents:
diff changeset
134 update_zmalloc_stat_alloc(zmalloc_size(ptr));
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parents:
diff changeset
135 return ptr;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
136 #else
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parents:
diff changeset
137 *((size_t*)ptr) = size;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
138 update_zmalloc_stat_alloc(size+PREFIX_SIZE);
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parents:
diff changeset
139 return (char*)ptr+PREFIX_SIZE;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
140 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
141 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
142
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
143 void *zrealloc(void *ptr, size_t size) {
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parents:
diff changeset
144 #ifndef HAVE_MALLOC_SIZE
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
145 void *realptr;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
146 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
147 size_t oldsize;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
148 void *newptr;
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149
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diff changeset
150 if (ptr == NULL) return zmalloc(size);
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parents:
diff changeset
151 #ifdef HAVE_MALLOC_SIZE
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MrJuneJune <me@mrjunejune.com>
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diff changeset
152 oldsize = zmalloc_size(ptr);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
153 newptr = realloc(ptr,size);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
154 if (!newptr) zmalloc_oom_handler(size);
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parents:
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155
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
156 update_zmalloc_stat_free(oldsize);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
157 update_zmalloc_stat_alloc(zmalloc_size(newptr));
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MrJuneJune <me@mrjunejune.com>
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158 return newptr;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
159 #else
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diff changeset
160 realptr = (char*)ptr-PREFIX_SIZE;
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parents:
diff changeset
161 oldsize = *((size_t*)realptr);
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162 newptr = realloc(realptr,size+PREFIX_SIZE);
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parents:
diff changeset
163 if (!newptr) zmalloc_oom_handler(size);
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164
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MrJuneJune <me@mrjunejune.com>
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165 *((size_t*)newptr) = size;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
166 update_zmalloc_stat_free(oldsize);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
167 update_zmalloc_stat_alloc(size);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
168 return (char*)newptr+PREFIX_SIZE;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
169 #endif
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MrJuneJune <me@mrjunejune.com>
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170 }
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MrJuneJune <me@mrjunejune.com>
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171
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
172 /* Provide zmalloc_size() for systems where this function is not provided by
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
173 * malloc itself, given that in that case we store a header with this
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
174 * information as the first bytes of every allocation. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
175 #ifndef HAVE_MALLOC_SIZE
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
176 size_t zmalloc_size(void *ptr) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
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177 void *realptr = (char*)ptr-PREFIX_SIZE;
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178 size_t size = *((size_t*)realptr);
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179 /* Assume at least that all the allocations are padded at sizeof(long) by
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MrJuneJune <me@mrjunejune.com>
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diff changeset
180 * the underlying allocator. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
181 if (size&(sizeof(long)-1)) size += sizeof(long)-(size&(sizeof(long)-1));
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diff changeset
182 return size+PREFIX_SIZE;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
183 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
184 #endif
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185
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
186 void zfree(void *ptr) {
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MrJuneJune <me@mrjunejune.com>
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diff changeset
187 #ifndef HAVE_MALLOC_SIZE
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MrJuneJune <me@mrjunejune.com>
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188 void *realptr;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
189 size_t oldsize;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
190 #endif
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diff changeset
191
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MrJuneJune <me@mrjunejune.com>
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diff changeset
192 if (ptr == NULL) return;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
193 #ifdef HAVE_MALLOC_SIZE
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diff changeset
194 update_zmalloc_stat_free(zmalloc_size(ptr));
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
195 free(ptr);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
196 #else
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diff changeset
197 realptr = (char*)ptr-PREFIX_SIZE;
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diff changeset
198 oldsize = *((size_t*)realptr);
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parents:
diff changeset
199 update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
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parents:
diff changeset
200 free(realptr);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
201 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
202 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
203
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parents:
diff changeset
204 char *zstrdup(const char *s) {
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parents:
diff changeset
205 size_t l = strlen(s)+1;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
206 char *p = zmalloc(l);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
207
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
208 memcpy(p,s,l);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
209 return p;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
210 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
211
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
212 size_t zmalloc_used_memory(void) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
213 size_t um;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
214 atomicGet(used_memory,um);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
215 return um;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
216 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
217
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
218 void zmalloc_set_oom_handler(void (*oom_handler)(size_t)) {
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parents:
diff changeset
219 zmalloc_oom_handler = oom_handler;
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parents:
diff changeset
220 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
221
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
222 /* Get the RSS information in an OS-specific way.
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
223 *
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parents:
diff changeset
224 * WARNING: the function zmalloc_get_rss() is not designed to be fast
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parents:
diff changeset
225 * and may not be called in the busy loops where Redis tries to release
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
226 * memory expiring or swapping out objects.
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
227 *
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parents:
diff changeset
228 * For this kind of "fast RSS reporting" usages use instead the
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parents:
diff changeset
229 * function RedisEstimateRSS() that is a much faster (and less precise)
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parents:
diff changeset
230 * version of the function. */
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parents:
diff changeset
231
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
232 #if defined(HAVE_PROC_STAT)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
233 #include <unistd.h>
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MrJuneJune <me@mrjunejune.com>
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diff changeset
234 #include <sys/types.h>
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diff changeset
235 #include <sys/stat.h>
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MrJuneJune <me@mrjunejune.com>
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diff changeset
236 #include <fcntl.h>
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parents:
diff changeset
237
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parents:
diff changeset
238 size_t zmalloc_get_rss(void) {
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parents:
diff changeset
239 int page = sysconf(_SC_PAGESIZE);
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parents:
diff changeset
240 size_t rss;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
241 char buf[4096];
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
242 char filename[256];
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
243 int fd, count;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
244 char *p, *x;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
245
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
246 snprintf(filename,256,"/proc/%d/stat",getpid());
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parents:
diff changeset
247 if ((fd = open(filename,O_RDONLY)) == -1) return 0;
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parents:
diff changeset
248 if (read(fd,buf,4096) <= 0) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
249 close(fd);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
250 return 0;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
251 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
252 close(fd);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
253
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
254 p = buf;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
255 count = 23; /* RSS is the 24th field in /proc/<pid>/stat */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
256 while(p && count--) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
257 p = strchr(p,' ');
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
258 if (p) p++;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
259 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
260 if (!p) return 0;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
261 x = strchr(p,' ');
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
262 if (!x) return 0;
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263 *x = '\0';
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264
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265 rss = strtoll(p,NULL,10);
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266 rss *= page;
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267 return rss;
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268 }
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269 #elif defined(HAVE_TASKINFO)
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270 #include <unistd.h>
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271 #include <stdio.h>
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272 #include <stdlib.h>
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273 #include <sys/types.h>
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274 #include <sys/sysctl.h>
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275 #include <mach/task.h>
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276 #include <mach/mach_init.h>
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277
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278 size_t zmalloc_get_rss(void) {
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279 task_t task = MACH_PORT_NULL;
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280 struct task_basic_info t_info;
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281 mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
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282
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283 if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS)
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284 return 0;
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285 task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
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286
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287 return t_info.resident_size;
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288 }
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289 #else
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290 size_t zmalloc_get_rss(void) {
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291 /* If we can't get the RSS in an OS-specific way for this system just
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292 * return the memory usage we estimated in zmalloc()..
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293 *
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294 * Fragmentation will appear to be always 1 (no fragmentation)
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295 * of course... */
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296 return zmalloc_used_memory();
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297 }
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298 #endif
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299
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300 /* Fragmentation = RSS / allocated-bytes */
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301 float zmalloc_get_fragmentation_ratio(size_t rss) {
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302 return (float)rss/zmalloc_used_memory();
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303 }
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304
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305 /* Get the sum of the specified field (converted form kb to bytes) in
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306 * /proc/self/smaps. The field must be specified with trailing ":" as it
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307 * apperas in the smaps output.
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308 *
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309 * If a pid is specified, the information is extracted for such a pid,
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310 * otherwise if pid is -1 the information is reported is about the
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311 * current process.
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312 *
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313 * Example: zmalloc_get_smap_bytes_by_field("Rss:",-1);
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314 */
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315 #if defined(HAVE_PROC_SMAPS)
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316 size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
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317 char line[1024];
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318 size_t bytes = 0;
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319 int flen = strlen(field);
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320 FILE *fp;
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321
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322 if (pid == -1) {
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323 fp = fopen("/proc/self/smaps","r");
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324 } else {
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325 char filename[128];
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326 snprintf(filename,sizeof(filename),"/proc/%ld/smaps",pid);
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327 fp = fopen(filename,"r");
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328 }
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329
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330 if (!fp) return 0;
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331 while(fgets(line,sizeof(line),fp) != NULL) {
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332 if (strncmp(line,field,flen) == 0) {
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333 char *p = strchr(line,'k');
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diff changeset
334 if (p) {
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335 *p = '\0';
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diff changeset
336 bytes += strtol(line+flen,NULL,10) * 1024;
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337 }
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338 }
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MrJuneJune <me@mrjunejune.com>
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339 }
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diff changeset
340 fclose(fp);
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341 return bytes;
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342 }
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parents:
diff changeset
343 #else
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diff changeset
344 size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
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345 ((void) field);
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diff changeset
346 ((void) pid);
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diff changeset
347 return 0;
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diff changeset
348 }
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parents:
diff changeset
349 #endif
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350
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diff changeset
351 size_t zmalloc_get_private_dirty(long pid) {
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352 return zmalloc_get_smap_bytes_by_field("Private_Dirty:",pid);
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diff changeset
353 }
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354
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diff changeset
355 /* Returns the size of physical memory (RAM) in bytes.
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356 * It looks ugly, but this is the cleanest way to achive cross platform results.
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357 * Cleaned up from:
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diff changeset
358 *
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diff changeset
359 * http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
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parents:
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360 *
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
361 * Note that this function:
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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diff changeset
362 * 1) Was released under the following CC attribution license:
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parents:
diff changeset
363 * http://creativecommons.org/licenses/by/3.0/deed.en_US.
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parents:
diff changeset
364 * 2) Was originally implemented by David Robert Nadeau.
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parents:
diff changeset
365 * 3) Was modified for Redis by Matt Stancliff.
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diff changeset
366 * 4) This note exists in order to comply with the original license.
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diff changeset
367 */
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diff changeset
368 size_t zmalloc_get_memory_size(void) {
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parents:
diff changeset
369 #if defined(__unix__) || defined(__unix) || defined(unix) || \
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diff changeset
370 (defined(__APPLE__) && defined(__MACH__))
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371 #if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
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parents:
diff changeset
372 int mib[2];
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diff changeset
373 mib[0] = CTL_HW;
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diff changeset
374 #if defined(HW_MEMSIZE)
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diff changeset
375 mib[1] = HW_MEMSIZE; /* OSX. --------------------- */
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parents:
diff changeset
376 #elif defined(HW_PHYSMEM64)
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diff changeset
377 mib[1] = HW_PHYSMEM64; /* NetBSD, OpenBSD. --------- */
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parents:
diff changeset
378 #endif
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diff changeset
379 int64_t size = 0; /* 64-bit */
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parents:
diff changeset
380 size_t len = sizeof(size);
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parents:
diff changeset
381 if (sysctl( mib, 2, &size, &len, NULL, 0) == 0)
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parents:
diff changeset
382 return (size_t)size;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
383 return 0L; /* Failed? */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
384
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diff changeset
385 #elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
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parents:
diff changeset
386 /* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
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diff changeset
387 return (size_t)sysconf(_SC_PHYS_PAGES) * (size_t)sysconf(_SC_PAGESIZE);
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parents:
diff changeset
388
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parents:
diff changeset
389 #elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
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parents:
diff changeset
390 /* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
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parents:
diff changeset
391 int mib[2];
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diff changeset
392 mib[0] = CTL_HW;
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393 #if defined(HW_REALMEM)
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394 mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */
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395 #elif defined(HW_PYSMEM)
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396 mib[1] = HW_PHYSMEM; /* Others. ------------------ */
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397 #endif
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398 unsigned int size = 0; /* 32-bit */
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399 size_t len = sizeof(size);
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400 if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
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401 return (size_t)size;
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402 return 0L; /* Failed? */
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403 #else
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404 return 0L; /* Unknown method to get the data. */
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405 #endif
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406 #else
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407 return 0L; /* Unknown OS. */
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408 #endif
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409 }
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410
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411