Mercurial > hg > nginx
annotate src/os/win32/ngx_shmem.c @ 9314:32a5186a2705
Win32: improved MinGW/MinGW-w64 GCC checks.
Previously, __GNUC__ was checked, which is now replaced with __MINGW32__
checks. The difference is that __MINGW32__ is defined when using MinGW
(or MinGW-w64) header files regardless of the compiler being used. And,
more importantly, it is not defined when Clang is being used (which
pretends to be GCC by default) with Windows SDK header files.
With this change, it is now possible to compile nginx with native Clang
on Windows. This current requires --with-ld-opt="-lkernel32 -luser32"
though, since native Clang on Windows uses MSVC linker, which does
not link kernel32.lib and user32.lib automatically.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 07 Aug 2024 03:56:59 +0300 |
parents | af7eba90645d |
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rev | line source |
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605 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
605 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
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12 /* |
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13 * Base addresses selected by system for shared memory mappings are likely |
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14 * to be different on Windows Vista and later versions due to address space |
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15 * layout randomization. This is however incompatible with storing absolute |
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16 * addresses within the shared memory. |
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17 * |
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18 * To make it possible to store absolute addresses we create mappings |
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19 * at the same address in all processes by starting mappings at predefined |
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20 * addresses. The addresses were selected somewhat randomly in order to |
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21 * minimize the probability that some other library doing something similar |
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22 * conflicts with us. The addresses are from the following typically free |
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23 * blocks: |
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24 * |
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25 * - 0x10000000 .. 0x70000000 (about 1.5 GB in total) on 32-bit platforms |
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26 * - 0x000000007fff0000 .. 0x000007f68e8b0000 (about 8 TB) on 64-bit platforms |
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27 * |
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28 * Additionally, we allow to change the mapping address once it was detected |
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29 * to be different from one originally used. This is needed to support |
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30 * reconfiguration. |
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31 */ |
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32 |
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33 |
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34 #ifdef _WIN64 |
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35 #define NGX_SHMEM_BASE 0x0000047047e00000 |
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36 #else |
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37 #define NGX_SHMEM_BASE 0x2efe0000 |
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38 #endif |
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39 |
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40 |
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41 ngx_uint_t ngx_allocation_granularity; |
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42 |
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43 |
605 | 44 ngx_int_t |
45 ngx_shm_alloc(ngx_shm_t *shm) | |
46 { | |
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47 u_char *name; |
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48 uint64_t size; |
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49 static u_char *base = (u_char *) NGX_SHMEM_BASE; |
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50 |
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51 name = ngx_alloc(shm->name.len + 2 + NGX_INT32_LEN, shm->log); |
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52 if (name == NULL) { |
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53 return NGX_ERROR; |
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54 } |
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55 |
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56 (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique); |
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57 |
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58 ngx_set_errno(0); |
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59 |
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60 size = shm->size; |
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61 |
605 | 62 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, |
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63 (u_long) (size >> 32), |
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64 (u_long) (size & 0xffffffff), |
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65 (char *) name); |
605 | 66 |
67 if (shm->handle == NULL) { | |
68 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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69 "CreateFileMapping(%uz, %s) failed", |
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70 shm->size, name); |
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71 ngx_free(name); |
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72 |
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73 return NGX_ERROR; |
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74 } |
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75 |
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76 ngx_free(name); |
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77 |
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78 if (ngx_errno == ERROR_ALREADY_EXISTS) { |
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79 shm->exists = 1; |
605 | 80 } |
81 | |
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82 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, base); |
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83 |
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84 if (shm->addr != NULL) { |
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85 base += ngx_align(size, ngx_allocation_granularity); |
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86 return NGX_OK; |
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87 } |
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88 |
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89 ngx_log_debug3(NGX_LOG_DEBUG_CORE, shm->log, ngx_errno, |
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90 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed, " |
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91 "retry without a base address", |
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92 shm->size, base, &shm->name); |
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93 |
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94 /* |
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95 * Order of shared memory zones may be different in the master process |
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96 * and worker processes after reconfiguration. As a result, the above |
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97 * may fail due to a conflict with a previously created mapping remapped |
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98 * to a different address. Additionally, there may be a conflict with |
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99 * some other uses of the memory. In this case we retry without a base |
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100 * address to let the system assign the address itself. |
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101 */ |
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102 |
605 | 103 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0); |
104 | |
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105 if (shm->addr != NULL) { |
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106 return NGX_OK; |
605 | 107 } |
108 | |
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109 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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110 "MapViewOfFile(%uz) of file mapping \"%V\" failed", |
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111 shm->size, &shm->name); |
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112 |
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113 if (CloseHandle(shm->handle) == 0) { |
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114 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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115 "CloseHandle() of file mapping \"%V\" failed", |
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116 &shm->name); |
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117 } |
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118 |
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119 return NGX_ERROR; |
605 | 120 } |
121 | |
122 | |
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123 ngx_int_t |
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124 ngx_shm_remap(ngx_shm_t *shm, u_char *addr) |
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125 { |
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126 if (UnmapViewOfFile(shm->addr) == 0) { |
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127 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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128 "UnmapViewOfFile(%p) of file mapping \"%V\" failed", |
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129 shm->addr, &shm->name); |
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130 return NGX_ERROR; |
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131 } |
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132 |
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133 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, addr); |
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134 |
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135 if (shm->addr != NULL) { |
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136 return NGX_OK; |
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137 } |
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138 |
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139 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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140 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed", |
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141 shm->size, addr, &shm->name); |
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142 |
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Win32: shared memory base addresses and remapping.
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143 return NGX_ERROR; |
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144 } |
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145 |
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Win32: shared memory base addresses and remapping.
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146 |
605 | 147 void |
148 ngx_shm_free(ngx_shm_t *shm) | |
149 { | |
150 if (UnmapViewOfFile(shm->addr) == 0) { | |
151 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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152 "UnmapViewOfFile(%p) of file mapping \"%V\" failed", |
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153 shm->addr, &shm->name); |
605 | 154 } |
155 | |
156 if (CloseHandle(shm->handle) == 0) { | |
157 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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158 "CloseHandle() of file mapping \"%V\" failed", |
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159 &shm->name); |
605 | 160 } |
161 } |