Mercurial > hg > nginx
annotate src/core/ngx_palloc.c @ 4829:40de49cf6b37
Fixed overflow if ngx_slab_alloc() is called with very big "size" argument.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 30 Aug 2012 15:09:21 +0000 |
parents | d620f497c50f |
children | 320abeb364e6 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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11 |
2049 | 12 static void *ngx_palloc_block(ngx_pool_t *pool, size_t size); |
13 static void *ngx_palloc_large(ngx_pool_t *pool, size_t size); | |
14 | |
15 | |
501 | 16 ngx_pool_t * |
17 ngx_create_pool(size_t size, ngx_log_t *log) | |
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18 { |
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19 ngx_pool_t *p; |
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20 |
3388 | 21 p = ngx_memalign(NGX_POOL_ALIGNMENT, size, log); |
501 | 22 if (p == NULL) { |
527 | 23 return NULL; |
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24 } |
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25 |
2049 | 26 p->d.last = (u_char *) p + sizeof(ngx_pool_t); |
27 p->d.end = (u_char *) p + size; | |
28 p->d.next = NULL; | |
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29 p->d.failed = 0; |
2049 | 30 |
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31 size = size - sizeof(ngx_pool_t); |
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32 p->max = (size < NGX_MAX_ALLOC_FROM_POOL) ? size : NGX_MAX_ALLOC_FROM_POOL; |
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33 |
581 | 34 p->current = p; |
35 p->chain = NULL; | |
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36 p->large = NULL; |
509 | 37 p->cleanup = NULL; |
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38 p->log = log; |
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39 |
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40 return p; |
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41 } |
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43 |
501 | 44 void |
45 ngx_destroy_pool(ngx_pool_t *pool) | |
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46 { |
509 | 47 ngx_pool_t *p, *n; |
48 ngx_pool_large_t *l; | |
49 ngx_pool_cleanup_t *c; | |
50 | |
51 for (c = pool->cleanup; c; c = c->next) { | |
52 if (c->handler) { | |
1744 | 53 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
54 "run cleanup: %p", c); | |
509 | 55 c->handler(c->data); |
56 } | |
57 } | |
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59 for (l = pool->large; l; l = l->next) { |
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60 |
461 | 61 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc); |
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62 |
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63 if (l->alloc) { |
477 | 64 ngx_free(l->alloc); |
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65 } |
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66 } |
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68 #if (NGX_DEBUG) |
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69 |
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70 /* |
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71 * we could allocate the pool->log from this pool |
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72 * so we cannot use this log while free()ing the pool |
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73 */ |
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74 |
2049 | 75 for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { |
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76 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
2049 | 77 "free: %p, unused: %uz", p, p->d.end - p->d.last); |
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78 |
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79 if (n == NULL) { |
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80 break; |
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81 } |
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82 } |
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84 #endif |
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85 |
2049 | 86 for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { |
477 | 87 ngx_free(p); |
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88 |
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89 if (n == NULL) { |
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90 break; |
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91 } |
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92 } |
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93 } |
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94 |
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95 |
2337 | 96 void |
97 ngx_reset_pool(ngx_pool_t *pool) | |
98 { | |
99 ngx_pool_t *p; | |
100 ngx_pool_large_t *l; | |
101 | |
102 for (l = pool->large; l; l = l->next) { | |
103 if (l->alloc) { | |
104 ngx_free(l->alloc); | |
105 } | |
106 } | |
107 | |
108 pool->large = NULL; | |
109 | |
110 for (p = pool; p; p = p->d.next) { | |
111 p->d.last = (u_char *) p + sizeof(ngx_pool_t); | |
112 } | |
113 } | |
114 | |
115 | |
501 | 116 void * |
117 ngx_palloc(ngx_pool_t *pool, size_t size) | |
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118 { |
2049 | 119 u_char *m; |
120 ngx_pool_t *p; | |
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121 |
2049 | 122 if (size <= pool->max) { |
123 | |
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124 p = pool->current; |
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125 |
2049 | 126 do { |
127 m = ngx_align_ptr(p->d.last, NGX_ALIGNMENT); | |
589 | 128 |
2049 | 129 if ((size_t) (p->d.end - m) >= size) { |
130 p->d.last = m + size; | |
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131 |
2049 | 132 return m; |
589 | 133 } |
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134 |
2049 | 135 p = p->d.next; |
136 | |
137 } while (p); | |
138 | |
139 return ngx_palloc_block(pool, size); | |
140 } | |
141 | |
142 return ngx_palloc_large(pool, size); | |
143 } | |
144 | |
145 | |
146 void * | |
147 ngx_pnalloc(ngx_pool_t *pool, size_t size) | |
148 { | |
149 u_char *m; | |
150 ngx_pool_t *p; | |
151 | |
152 if (size <= pool->max) { | |
153 | |
154 p = pool->current; | |
155 | |
156 do { | |
157 m = p->d.last; | |
158 | |
159 if ((size_t) (p->d.end - m) >= size) { | |
160 p->d.last = m + size; | |
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161 |
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162 return m; |
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163 } |
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164 |
2049 | 165 p = p->d.next; |
166 | |
167 } while (p); | |
168 | |
169 return ngx_palloc_block(pool, size); | |
170 } | |
171 | |
172 return ngx_palloc_large(pool, size); | |
173 } | |
174 | |
581 | 175 |
2049 | 176 static void * |
177 ngx_palloc_block(ngx_pool_t *pool, size_t size) | |
178 { | |
179 u_char *m; | |
2055 | 180 size_t psize; |
2049 | 181 ngx_pool_t *p, *new, *current; |
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182 |
2055 | 183 psize = (size_t) (pool->d.end - (u_char *) pool); |
184 | |
3388 | 185 m = ngx_memalign(NGX_POOL_ALIGNMENT, psize, pool->log); |
2056 | 186 if (m == NULL) { |
2049 | 187 return NULL; |
188 } | |
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189 |
2056 | 190 new = (ngx_pool_t *) m; |
191 | |
192 new->d.end = m + psize; | |
2055 | 193 new->d.next = NULL; |
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194 new->d.failed = 0; |
2055 | 195 |
2056 | 196 m += sizeof(ngx_pool_data_t); |
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197 m = ngx_align_ptr(m, NGX_ALIGNMENT); |
2056 | 198 new->d.last = m + size; |
199 | |
2049 | 200 current = pool->current; |
201 | |
202 for (p = current; p->d.next; p = p->d.next) { | |
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203 if (p->d.failed++ > 4) { |
2049 | 204 current = p->d.next; |
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205 } |
2049 | 206 } |
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207 |
2049 | 208 p->d.next = new; |
209 | |
210 pool->current = current ? current : new; | |
581 | 211 |
2049 | 212 return m; |
213 } | |
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214 |
2049 | 215 |
216 static void * | |
217 ngx_palloc_large(ngx_pool_t *pool, size_t size) | |
218 { | |
219 void *p; | |
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220 ngx_uint_t n; |
2049 | 221 ngx_pool_large_t *large; |
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222 |
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223 p = ngx_alloc(size, pool->log); |
501 | 224 if (p == NULL) { |
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225 return NULL; |
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226 } |
2129 | 227 |
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228 n = 0; |
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229 |
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230 for (large = pool->large; large; large = large->next) { |
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231 if (large->alloc == NULL) { |
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232 large->alloc = p; |
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233 return p; |
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234 } |
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235 |
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236 if (n++ > 3) { |
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237 break; |
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238 } |
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239 } |
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240 |
2129 | 241 large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); |
242 if (large == NULL) { | |
243 ngx_free(p); | |
244 return NULL; | |
245 } | |
246 | |
247 large->alloc = p; | |
248 large->next = pool->large; | |
249 pool->large = large; | |
250 | |
251 return p; | |
252 } | |
253 | |
254 | |
255 void * | |
256 ngx_pmemalign(ngx_pool_t *pool, size_t size, size_t alignment) | |
257 { | |
258 void *p; | |
259 ngx_pool_large_t *large; | |
260 | |
261 p = ngx_memalign(alignment, size, pool->log); | |
262 if (p == NULL) { | |
263 return NULL; | |
264 } | |
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265 |
629 | 266 large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); |
267 if (large == NULL) { | |
1317 | 268 ngx_free(p); |
629 | 269 return NULL; |
156
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270 } |
0
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271 |
156
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272 large->alloc = p; |
629 | 273 large->next = pool->large; |
274 pool->large = large; | |
156
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275 |
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276 return p; |
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277 } |
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278 |
0
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279 |
501 | 280 ngx_int_t |
281 ngx_pfree(ngx_pool_t *pool, void *p) | |
156
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282 { |
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283 ngx_pool_large_t *l; |
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284 |
156
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285 for (l = pool->large; l; l = l->next) { |
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286 if (p == l->alloc) { |
257
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287 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
461 | 288 "free: %p", l->alloc); |
477 | 289 ngx_free(l->alloc); |
156
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290 l->alloc = NULL; |
436
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291 |
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292 return NGX_OK; |
156
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293 } |
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294 } |
436
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295 |
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296 return NGX_DECLINED; |
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297 } |
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298 |
156
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299 |
501 | 300 void * |
301 ngx_pcalloc(ngx_pool_t *pool, size_t size) | |
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302 { |
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303 void *p; |
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304 |
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305 p = ngx_palloc(pool, size); |
39
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306 if (p) { |
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307 ngx_memzero(p, size); |
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308 } |
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309 |
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310 return p; |
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311 } |
346
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312 |
509 | 313 |
314 ngx_pool_cleanup_t * | |
563 | 315 ngx_pool_cleanup_add(ngx_pool_t *p, size_t size) |
509 | 316 { |
317 ngx_pool_cleanup_t *c; | |
318 | |
319 c = ngx_palloc(p, sizeof(ngx_pool_cleanup_t)); | |
320 if (c == NULL) { | |
321 return NULL; | |
322 } | |
323 | |
563 | 324 if (size) { |
325 c->data = ngx_palloc(p, size); | |
326 if (c->data == NULL) { | |
327 return NULL; | |
328 } | |
329 | |
330 } else { | |
331 c->data = NULL; | |
332 } | |
333 | |
334 c->handler = NULL; | |
509 | 335 c->next = p->cleanup; |
336 | |
337 p->cleanup = c; | |
338 | |
563 | 339 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, p->log, 0, "add cleanup: %p", c); |
340 | |
509 | 341 return c; |
342 } | |
343 | |
344 | |
345 void | |
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346 ngx_pool_run_cleanup_file(ngx_pool_t *p, ngx_fd_t fd) |
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347 { |
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348 ngx_pool_cleanup_t *c; |
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349 ngx_pool_cleanup_file_t *cf; |
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350 |
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351 for (c = p->cleanup; c; c = c->next) { |
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352 if (c->handler == ngx_pool_cleanup_file) { |
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353 |
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354 cf = c->data; |
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355 |
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356 if (cf->fd == fd) { |
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357 c->handler(cf); |
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358 c->handler = NULL; |
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359 return; |
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360 } |
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361 } |
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362 } |
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363 } |
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364 |
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365 |
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366 void |
509 | 367 ngx_pool_cleanup_file(void *data) |
368 { | |
369 ngx_pool_cleanup_file_t *c = data; | |
370 | |
1744 | 371 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d", |
372 c->fd); | |
563 | 373 |
509 | 374 if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { |
375 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, | |
376 ngx_close_file_n " \"%s\" failed", c->name); | |
377 } | |
378 } | |
379 | |
380 | |
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381 void |
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382 ngx_pool_delete_file(void *data) |
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383 { |
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384 ngx_pool_cleanup_file_t *c = data; |
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385 |
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386 ngx_err_t err; |
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387 |
1744 | 388 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d %s", |
389 c->fd, c->name); | |
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390 |
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391 if (ngx_delete_file(c->name) == NGX_FILE_ERROR) { |
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392 err = ngx_errno; |
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393 |
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394 if (err != NGX_ENOENT) { |
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395 ngx_log_error(NGX_LOG_CRIT, c->log, err, |
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396 ngx_delete_file_n " \"%s\" failed", c->name); |
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397 } |
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398 } |
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399 |
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400 if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { |
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401 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, |
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402 ngx_close_file_n " \"%s\" failed", c->name); |
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403 } |
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404 } |
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405 |
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406 |
346
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407 #if 0 |
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408 |
501 | 409 static void * |
410 ngx_get_cached_block(size_t size) | |
346
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411 { |
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412 void *p; |
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413 ngx_cached_block_slot_t *slot; |
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414 |
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415 if (ngx_cycle->cache == NULL) { |
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416 return NULL; |
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nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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417 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
418 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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419 slot = &ngx_cycle->cache[(size + ngx_pagesize - 1) / ngx_pagesize]; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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420 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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421 slot->tries++; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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422 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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423 if (slot->number) { |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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424 p = slot->block; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
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425 slot->block = slot->block->next; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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426 slot->number--; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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427 return p; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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428 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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429 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
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430 return NULL; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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431 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
432 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
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433 #endif |