malloc.c revision 1.17
1 1.1 cgd /* 2 1.17 tls * ---------------------------------------------------------------------------- 3 1.17 tls * "THE BEER-WARE LICENSE" (Revision 42): 4 1.17 tls * <phk (at) FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 1.17 tls * can do whatever you want with this stuff. If we meet some day, and you think 6 1.17 tls * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 1.17 tls * ---------------------------------------------------------------------------- 8 1.1 cgd * 9 1.17 tls * From FreeBSD: malloc.c,v 1.43 1998/09/30 06:13:59 jb 10 1.1 cgd * 11 1.17 tls */ 12 1.17 tls 13 1.17 tls /* 14 1.17 tls * Defining EXTRA_SANITY will enable extra checks which are related 15 1.17 tls * to internal conditions and consistency in malloc.c. This has a 16 1.17 tls * noticeable runtime performance hit, and generally will not do you 17 1.17 tls * any good unless you fiddle with the internals of malloc or want 18 1.17 tls * to catch random pointer corruption as early as possible. 19 1.17 tls */ 20 1.17 tls #ifndef MALLOC_EXTRA_SANITY 21 1.17 tls #undef MALLOC_EXTRA_SANITY 22 1.5 thorpej #endif 23 1.1 cgd 24 1.1 cgd /* 25 1.17 tls * What to use for Junk. This is the byte value we use to fill with 26 1.17 tls * when the 'J' option is enabled. 27 1.17 tls */ 28 1.17 tls #define SOME_JUNK 0xd0 /* as in "Duh" :-) */ 29 1.17 tls 30 1.17 tls /* 31 1.17 tls * The basic parameters you can tweak. 32 1.17 tls * 33 1.17 tls * malloc_pageshift pagesize = 1 << malloc_pageshift 34 1.17 tls * It's probably best if this is the native 35 1.17 tls * page size, but it doesn't have to be. 36 1.17 tls * 37 1.17 tls * malloc_minsize minimum size of an allocation in bytes. 38 1.17 tls * If this is too small it's too much work 39 1.17 tls * to manage them. This is also the smallest 40 1.17 tls * unit of alignment used for the storage 41 1.17 tls * returned by malloc/realloc. 42 1.1 cgd * 43 1.1 cgd */ 44 1.1 cgd 45 1.17 tls #if defined(__FreeBSD__) 46 1.17 tls # if defined(__i386__) 47 1.17 tls # define malloc_pageshift 12U 48 1.17 tls # define malloc_minsize 16U 49 1.17 tls # endif 50 1.17 tls # if defined(__alpha__) 51 1.17 tls # define malloc_pageshift 13U 52 1.17 tls # define malloc_minsize 16U 53 1.17 tls # endif 54 1.17 tls # if !defined(__NETBSD_SYSCALLS) 55 1.17 tls # define HAS_UTRACE 56 1.17 tls # endif 57 1.17 tls /* 58 1.17 tls * Make malloc/free/realloc thread-safe in libc for use with 59 1.17 tls * kernel threads. 60 1.17 tls */ 61 1.17 tls # include "libc_private.h" 62 1.17 tls # include "spinlock.h" 63 1.17 tls static spinlock_t thread_lock = _SPINLOCK_INITIALIZER; 64 1.17 tls # define THREAD_LOCK() if (__isthreaded) _SPINLOCK(&thread_lock); 65 1.17 tls # define THREAD_UNLOCK() if (__isthreaded) _SPINUNLOCK(&thread_lock); 66 1.17 tls #endif /* __FreeBSD__ */ 67 1.17 tls 68 1.17 tls #if defined(__NetBSD__) 69 1.17 tls # include <sys/param.h> 70 1.17 tls # define malloc_pageshift PGSHIFT 71 1.17 tls # define malloc_minsize 16U 72 1.17 tls # define MADV_FREE MADV_DONTNEED 73 1.17 tls #endif /* __NetBSD__ */ 74 1.17 tls 75 1.17 tls #if defined(__sparc__) && defined(sun) 76 1.17 tls # define malloc_pageshift 12U 77 1.17 tls # define malloc_minsize 16U 78 1.17 tls # define MAP_ANON (0) 79 1.17 tls static int fdzero; 80 1.17 tls # define MMAP_FD fdzero 81 1.17 tls # define INIT_MMAP() \ 82 1.17 tls { if ((fdzero=open("/dev/zero", O_RDWR, 0000)) == -1) \ 83 1.17 tls wrterror("open of /dev/zero"); } 84 1.17 tls # define MADV_FREE MADV_DONTNEED 85 1.17 tls #endif /* __sparc__ */ 86 1.17 tls 87 1.17 tls /* Insert your combination here... */ 88 1.17 tls #if defined(__FOOCPU__) && defined(__BAROS__) 89 1.17 tls # define malloc_pageshift 12U 90 1.17 tls # define malloc_minsize 16U 91 1.17 tls #endif /* __FOOCPU__ && __BAROS__ */ 92 1.17 tls 93 1.17 tls 94 1.17 tls /* 95 1.17 tls * No user serviceable parts behind this point. 96 1.17 tls */ 97 1.16 kleink #include <sys/types.h> 98 1.17 tls #include <sys/mman.h> 99 1.17 tls #include <errno.h> 100 1.17 tls #include <fcntl.h> 101 1.17 tls #include <stddef.h> 102 1.9 christos #include <stdio.h> 103 1.1 cgd #include <stdlib.h> 104 1.1 cgd #include <string.h> 105 1.1 cgd #include <unistd.h> 106 1.1 cgd 107 1.17 tls /* 108 1.17 tls * This structure describes a page worth of chunks. 109 1.17 tls */ 110 1.17 tls 111 1.17 tls struct pginfo { 112 1.17 tls struct pginfo *next; /* next on the free list */ 113 1.17 tls void *page; /* Pointer to the page */ 114 1.17 tls u_short size; /* size of this page's chunks */ 115 1.17 tls u_short shift; /* How far to shift for this size chunks */ 116 1.17 tls u_short free; /* How many free chunks */ 117 1.17 tls u_short total; /* How many chunk */ 118 1.17 tls u_int bits[1]; /* Which chunks are free */ 119 1.17 tls }; 120 1.1 cgd 121 1.1 cgd /* 122 1.17 tls * This structure describes a number of free pages. 123 1.17 tls */ 124 1.17 tls 125 1.17 tls struct pgfree { 126 1.17 tls struct pgfree *next; /* next run of free pages */ 127 1.17 tls struct pgfree *prev; /* prev run of free pages */ 128 1.17 tls void *page; /* pointer to free pages */ 129 1.17 tls void *end; /* pointer to end of free pages */ 130 1.17 tls size_t size; /* number of bytes free */ 131 1.1 cgd }; 132 1.1 cgd 133 1.17 tls /* 134 1.17 tls * How many bits per u_int in the bitmap. 135 1.17 tls * Change only if not 8 bits/byte 136 1.17 tls */ 137 1.17 tls #define MALLOC_BITS (8*sizeof(u_int)) 138 1.17 tls 139 1.17 tls /* 140 1.17 tls * Magic values to put in the page_directory 141 1.17 tls */ 142 1.17 tls #define MALLOC_NOT_MINE ((struct pginfo*) 0) 143 1.17 tls #define MALLOC_FREE ((struct pginfo*) 1) 144 1.17 tls #define MALLOC_FIRST ((struct pginfo*) 2) 145 1.17 tls #define MALLOC_FOLLOW ((struct pginfo*) 3) 146 1.17 tls #define MALLOC_MAGIC ((struct pginfo*) 4) 147 1.17 tls 148 1.17 tls #ifndef malloc_pageshift 149 1.17 tls #define malloc_pageshift 12U 150 1.17 tls #endif 151 1.17 tls 152 1.17 tls #ifndef malloc_minsize 153 1.17 tls #define malloc_minsize 16U 154 1.17 tls #endif 155 1.17 tls 156 1.17 tls #if !defined(malloc_pagesize) 157 1.17 tls #define malloc_pagesize (1UL<<malloc_pageshift) 158 1.16 kleink #endif 159 1.1 cgd 160 1.17 tls #if ((1<<malloc_pageshift) != malloc_pagesize) 161 1.17 tls #error "(1<<malloc_pageshift) != malloc_pagesize" 162 1.1 cgd #endif 163 1.1 cgd 164 1.17 tls #ifndef malloc_maxsize 165 1.17 tls #define malloc_maxsize ((malloc_pagesize)>>1) 166 1.17 tls #endif 167 1.17 tls 168 1.17 tls /* A mask for the offset inside a page. */ 169 1.17 tls #define malloc_pagemask ((malloc_pagesize)-1) 170 1.17 tls 171 1.17 tls #define pageround(foo) (((foo) + (malloc_pagemask))&(~(malloc_pagemask))) 172 1.17 tls #define ptr2index(foo) (((u_long)(foo) >> malloc_pageshift)-malloc_origo) 173 1.1 cgd 174 1.17 tls #ifndef THREAD_LOCK 175 1.17 tls #define THREAD_LOCK() 176 1.17 tls #endif 177 1.1 cgd 178 1.17 tls #ifndef THREAD_UNLOCK 179 1.17 tls #define THREAD_UNLOCK() 180 1.16 kleink #endif 181 1.16 kleink 182 1.17 tls #ifndef MMAP_FD 183 1.17 tls #define MMAP_FD (-1) 184 1.1 cgd #endif 185 1.1 cgd 186 1.17 tls #ifndef INIT_MMAP 187 1.17 tls #define INIT_MMAP() 188 1.9 christos #endif 189 1.9 christos 190 1.17 tls /* Set when initialization has been done */ 191 1.17 tls static unsigned malloc_started; 192 1.17 tls 193 1.17 tls /* Recusion flag for public interface. */ 194 1.17 tls static int malloc_active; 195 1.17 tls 196 1.17 tls /* Number of free pages we cache */ 197 1.17 tls static unsigned malloc_cache = 16; 198 1.17 tls 199 1.17 tls /* The offset from pagenumber to index into the page directory */ 200 1.17 tls static u_long malloc_origo; 201 1.17 tls 202 1.17 tls /* The last index in the page directory we care about */ 203 1.17 tls static u_long last_index; 204 1.17 tls 205 1.17 tls /* Pointer to page directory. Allocated "as if with" malloc */ 206 1.17 tls static struct pginfo **page_dir; 207 1.17 tls 208 1.17 tls /* How many slots in the page directory */ 209 1.17 tls static unsigned malloc_ninfo; 210 1.17 tls 211 1.17 tls /* Free pages line up here */ 212 1.17 tls static struct pgfree free_list; 213 1.17 tls 214 1.17 tls /* Abort(), user doesn't handle problems. */ 215 1.17 tls static int malloc_abort; 216 1.17 tls 217 1.17 tls /* Are we trying to die ? */ 218 1.17 tls static int suicide; 219 1.17 tls 220 1.17 tls /* always realloc ? */ 221 1.17 tls static int malloc_realloc; 222 1.9 christos 223 1.17 tls /* pass the kernel a hint on free pages ? */ 224 1.17 tls static int malloc_hint = 1; 225 1.17 tls 226 1.17 tls /* xmalloc behaviour ? */ 227 1.17 tls static int malloc_xmalloc; 228 1.17 tls 229 1.17 tls /* sysv behaviour for malloc(0) ? */ 230 1.17 tls static int malloc_sysv; 231 1.17 tls 232 1.17 tls /* zero fill ? */ 233 1.17 tls static int malloc_zero; 234 1.17 tls 235 1.17 tls /* junk fill ? */ 236 1.17 tls static int malloc_junk; 237 1.17 tls 238 1.17 tls #ifdef HAS_UTRACE 239 1.17 tls 240 1.17 tls /* utrace ? */ 241 1.17 tls static int malloc_utrace; 242 1.17 tls 243 1.17 tls struct ut { void *p; size_t s; void *r; }; 244 1.17 tls 245 1.17 tls void utrace __P((struct ut *, int)); 246 1.17 tls 247 1.17 tls #define UTRACE(a, b, c) \ 248 1.17 tls if (malloc_utrace) \ 249 1.17 tls {struct ut u; u.p=a; u.s = b; u.r=c; utrace(&u, sizeof u);} 250 1.17 tls #else /* !HAS_UTRACE */ 251 1.17 tls #define UTRACE(a,b,c) 252 1.17 tls #endif /* HAS_UTRACE */ 253 1.17 tls 254 1.17 tls /* my last break. */ 255 1.17 tls static void *malloc_brk; 256 1.17 tls 257 1.17 tls /* one location cache for free-list holders */ 258 1.17 tls static struct pgfree *px; 259 1.17 tls 260 1.17 tls /* compile-time options */ 261 1.17 tls char *malloc_options; 262 1.17 tls 263 1.17 tls /* Name of the current public function */ 264 1.17 tls static char *malloc_func; 265 1.17 tls 266 1.17 tls /* Macro for mmap */ 267 1.17 tls #define MMAP(size) \ 268 1.17 tls mmap(0, (size), PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, \ 269 1.17 tls MMAP_FD, 0); 270 1.9 christos 271 1.16 kleink /* 272 1.17 tls * Necessary function declarations 273 1.16 kleink */ 274 1.17 tls static int extend_pgdir(u_long index); 275 1.17 tls static void *imalloc(size_t size); 276 1.17 tls static void ifree(void *ptr); 277 1.17 tls static void *irealloc(void *ptr, size_t size); 278 1.17 tls 279 1.17 tls extern char *__progname; 280 1.17 tls 281 1.17 tls static void 282 1.17 tls wrterror(char *p) 283 1.17 tls { 284 1.17 tls char *q = " error: "; 285 1.17 tls write(STDERR_FILENO, __progname, strlen(__progname)); 286 1.17 tls write(STDERR_FILENO, malloc_func, strlen(malloc_func)); 287 1.17 tls write(STDERR_FILENO, q, strlen(q)); 288 1.17 tls write(STDERR_FILENO, p, strlen(p)); 289 1.17 tls suicide = 1; 290 1.17 tls abort(); 291 1.17 tls } 292 1.17 tls 293 1.16 kleink static void 294 1.17 tls wrtwarning(char *p) 295 1.1 cgd { 296 1.17 tls char *q = " warning: "; 297 1.17 tls if (malloc_abort) 298 1.17 tls wrterror(p); 299 1.17 tls write(STDERR_FILENO, __progname, strlen(__progname)); 300 1.17 tls write(STDERR_FILENO, malloc_func, strlen(malloc_func)); 301 1.17 tls write(STDERR_FILENO, q, strlen(q)); 302 1.17 tls write(STDERR_FILENO, p, strlen(p)); 303 1.17 tls } 304 1.17 tls 305 1.16 kleink 306 1.17 tls /* 307 1.17 tls * Allocate a number of pages from the OS 308 1.17 tls */ 309 1.17 tls static void * 310 1.17 tls map_pages(int pages) 311 1.17 tls { 312 1.17 tls caddr_t result, tail; 313 1.16 kleink 314 1.17 tls result = (caddr_t)pageround((u_long)sbrk(0)); 315 1.17 tls tail = result + (pages << malloc_pageshift); 316 1.17 tls 317 1.17 tls if (brk(tail)) { 318 1.17 tls #ifdef EXTRA_SANITY 319 1.17 tls wrterror("(ES): map_pages fails\n"); 320 1.17 tls #endif /* EXTRA_SANITY */ 321 1.17 tls return 0; 322 1.17 tls } 323 1.17 tls 324 1.17 tls last_index = ptr2index(tail) - 1; 325 1.17 tls malloc_brk = tail; 326 1.17 tls 327 1.17 tls if ((last_index+1) >= malloc_ninfo && !extend_pgdir(last_index)) 328 1.17 tls return 0;; 329 1.16 kleink 330 1.17 tls return result; 331 1.1 cgd } 332 1.1 cgd 333 1.17 tls /* 334 1.17 tls * Extend page directory 335 1.17 tls */ 336 1.17 tls static int 337 1.17 tls extend_pgdir(u_long index) 338 1.1 cgd { 339 1.17 tls struct pginfo **new, **old; 340 1.17 tls int i, oldlen; 341 1.1 cgd 342 1.17 tls /* Make it this many pages */ 343 1.17 tls i = index * sizeof *page_dir; 344 1.17 tls i /= malloc_pagesize; 345 1.17 tls i += 2; 346 1.17 tls 347 1.17 tls /* remember the old mapping size */ 348 1.17 tls oldlen = malloc_ninfo * sizeof *page_dir; 349 1.17 tls 350 1.17 tls /* 351 1.17 tls * NOTE: we allocate new pages and copy the directory rather than tempt 352 1.17 tls * fate by trying to "grow" the region.. There is nothing to prevent 353 1.17 tls * us from accidently re-mapping space that's been allocated by our caller 354 1.17 tls * via dlopen() or other mmap(). 355 1.17 tls * 356 1.17 tls * The copy problem is not too bad, as there is 4K of page index per 357 1.17 tls * 4MB of malloc arena. 358 1.17 tls * 359 1.17 tls * We can totally avoid the copy if we open a file descriptor to associate 360 1.17 tls * the anon mappings with. Then, when we remap the pages at the new 361 1.17 tls * address, the old pages will be "magically" remapped.. But this means 362 1.17 tls * keeping open a "secret" file descriptor..... 363 1.17 tls */ 364 1.17 tls 365 1.17 tls /* Get new pages */ 366 1.17 tls new = (struct pginfo**) MMAP(i * malloc_pagesize); 367 1.17 tls if (new == (struct pginfo **)-1) 368 1.17 tls return 0; 369 1.17 tls 370 1.17 tls /* Copy the old stuff */ 371 1.17 tls memcpy(new, page_dir, 372 1.17 tls malloc_ninfo * sizeof *page_dir); 373 1.17 tls 374 1.17 tls /* register the new size */ 375 1.17 tls malloc_ninfo = i * malloc_pagesize / sizeof *page_dir; 376 1.17 tls 377 1.17 tls /* swap the pointers */ 378 1.17 tls old = page_dir; 379 1.17 tls page_dir = new; 380 1.17 tls 381 1.17 tls /* Now free the old stuff */ 382 1.17 tls munmap(old, oldlen); 383 1.17 tls return 1; 384 1.17 tls } 385 1.16 kleink 386 1.17 tls /* 387 1.17 tls * Initialize the world 388 1.17 tls */ 389 1.17 tls static void 390 1.17 tls malloc_init (void) 391 1.17 tls { 392 1.17 tls char *p, b[64]; 393 1.17 tls int i, j; 394 1.17 tls int errnosave; 395 1.17 tls 396 1.17 tls INIT_MMAP(); 397 1.17 tls 398 1.17 tls #ifdef EXTRA_SANITY 399 1.17 tls malloc_junk = 1; 400 1.17 tls #endif /* EXTRA_SANITY */ 401 1.17 tls 402 1.17 tls for (i = 0; i < 3; i++) { 403 1.17 tls if (i == 0) { 404 1.17 tls errnosave = errno; 405 1.17 tls j = readlink("/etc/malloc.conf", b, sizeof b - 1); 406 1.17 tls errno = errnosave; 407 1.17 tls if (j <= 0) 408 1.17 tls continue; 409 1.17 tls b[j] = '\0'; 410 1.17 tls p = b; 411 1.17 tls } else if (i == 1) { 412 1.17 tls p = getenv("MALLOC_OPTIONS"); 413 1.17 tls } else { 414 1.17 tls p = malloc_options; 415 1.1 cgd } 416 1.17 tls for (; p && *p; p++) { 417 1.17 tls switch (*p) { 418 1.17 tls case '>': malloc_cache <<= 1; break; 419 1.17 tls case '<': malloc_cache >>= 1; break; 420 1.17 tls case 'a': malloc_abort = 0; break; 421 1.17 tls case 'A': malloc_abort = 1; break; 422 1.17 tls case 'h': malloc_hint = 0; break; 423 1.17 tls case 'H': malloc_hint = 1; break; 424 1.17 tls case 'r': malloc_realloc = 0; break; 425 1.17 tls case 'R': malloc_realloc = 1; break; 426 1.17 tls case 'j': malloc_junk = 0; break; 427 1.17 tls case 'J': malloc_junk = 1; break; 428 1.17 tls #ifdef HAS_UTRACE 429 1.17 tls case 'u': malloc_utrace = 0; break; 430 1.17 tls case 'U': malloc_utrace = 1; break; 431 1.17 tls #endif 432 1.17 tls case 'v': malloc_sysv = 0; break; 433 1.17 tls case 'V': malloc_sysv = 1; break; 434 1.17 tls case 'x': malloc_xmalloc = 0; break; 435 1.17 tls case 'X': malloc_xmalloc = 1; break; 436 1.17 tls case 'z': malloc_zero = 0; break; 437 1.17 tls case 'Z': malloc_zero = 1; break; 438 1.17 tls default: 439 1.17 tls j = malloc_abort; 440 1.17 tls malloc_abort = 0; 441 1.17 tls wrtwarning("unknown char in MALLOC_OPTIONS\n"); 442 1.17 tls malloc_abort = j; 443 1.17 tls break; 444 1.17 tls } 445 1.1 cgd } 446 1.17 tls } 447 1.17 tls 448 1.17 tls UTRACE(0, 0, 0); 449 1.17 tls 450 1.17 tls /* 451 1.17 tls * We want junk in the entire allocation, and zero only in the part 452 1.17 tls * the user asked for. 453 1.17 tls */ 454 1.17 tls if (malloc_zero) 455 1.17 tls malloc_junk=1; 456 1.17 tls 457 1.17 tls /* 458 1.17 tls * If we run with junk (or implicitly from above: zero), we want to 459 1.17 tls * force realloc() to get new storage, so we can DTRT with it. 460 1.17 tls */ 461 1.17 tls if (malloc_junk) 462 1.17 tls malloc_realloc=1; 463 1.17 tls 464 1.17 tls /* Allocate one page for the page directory */ 465 1.17 tls page_dir = (struct pginfo **) MMAP(malloc_pagesize); 466 1.17 tls 467 1.17 tls if (page_dir == (struct pginfo **) -1) 468 1.17 tls wrterror("mmap(2) failed, check limits.\n"); 469 1.17 tls 470 1.17 tls /* 471 1.17 tls * We need a maximum of malloc_pageshift buckets, steal these from the 472 1.17 tls * front of the page_directory; 473 1.17 tls */ 474 1.17 tls malloc_origo = ((u_long)pageround((u_long)sbrk(0))) >> malloc_pageshift; 475 1.17 tls malloc_origo -= malloc_pageshift; 476 1.17 tls 477 1.17 tls malloc_ninfo = malloc_pagesize / sizeof *page_dir; 478 1.17 tls 479 1.17 tls /* Recalculate the cache size in bytes, and make sure it's nonzero */ 480 1.17 tls 481 1.17 tls if (!malloc_cache) 482 1.17 tls malloc_cache++; 483 1.17 tls 484 1.17 tls malloc_cache <<= malloc_pageshift; 485 1.17 tls 486 1.17 tls /* 487 1.17 tls * This is a nice hack from Kaleb Keithly (kaleb (at) x.org). 488 1.17 tls * We can sbrk(2) further back when we keep this on a low address. 489 1.17 tls */ 490 1.17 tls px = (struct pgfree *) imalloc (sizeof *px); 491 1.17 tls 492 1.17 tls /* Been here, done that */ 493 1.17 tls malloc_started++; 494 1.17 tls } 495 1.17 tls 496 1.17 tls /* 497 1.17 tls * Allocate a number of complete pages 498 1.17 tls */ 499 1.17 tls static void * 500 1.17 tls malloc_pages(size_t size) 501 1.17 tls { 502 1.17 tls void *p, *delay_free = 0; 503 1.17 tls int i; 504 1.17 tls struct pgfree *pf; 505 1.17 tls u_long index; 506 1.17 tls 507 1.17 tls size = pageround(size); 508 1.17 tls 509 1.17 tls p = 0; 510 1.17 tls 511 1.17 tls /* Look for free pages before asking for more */ 512 1.17 tls for(pf = free_list.next; pf; pf = pf->next) { 513 1.17 tls 514 1.17 tls #ifdef EXTRA_SANITY 515 1.17 tls if (pf->size & malloc_pagemask) 516 1.17 tls wrterror("(ES): junk length entry on free_list\n"); 517 1.17 tls if (!pf->size) 518 1.17 tls wrterror("(ES): zero length entry on free_list\n"); 519 1.17 tls if (pf->page == pf->end) 520 1.17 tls wrterror("(ES): zero entry on free_list\n"); 521 1.17 tls if (pf->page > pf->end) 522 1.17 tls wrterror("(ES): sick entry on free_list\n"); 523 1.17 tls if ((void*)pf->page >= (void*)sbrk(0)) 524 1.17 tls wrterror("(ES): entry on free_list past brk\n"); 525 1.17 tls if (page_dir[ptr2index(pf->page)] != MALLOC_FREE) 526 1.17 tls wrterror("(ES): non-free first page on free-list\n"); 527 1.17 tls if (page_dir[ptr2index(pf->end)-1] != MALLOC_FREE) 528 1.17 tls wrterror("(ES): non-free last page on free-list\n"); 529 1.17 tls #endif /* EXTRA_SANITY */ 530 1.17 tls 531 1.17 tls if (pf->size < size) 532 1.17 tls continue; 533 1.17 tls 534 1.17 tls if (pf->size == size) { 535 1.17 tls p = pf->page; 536 1.17 tls if (pf->next) 537 1.17 tls pf->next->prev = pf->prev; 538 1.17 tls pf->prev->next = pf->next; 539 1.17 tls delay_free = pf; 540 1.17 tls break; 541 1.17 tls } 542 1.17 tls 543 1.17 tls p = pf->page; 544 1.17 tls pf->page = (char *)pf->page + size; 545 1.17 tls pf->size -= size; 546 1.17 tls break; 547 1.17 tls } 548 1.17 tls 549 1.17 tls #ifdef EXTRA_SANITY 550 1.17 tls if (p && page_dir[ptr2index(p)] != MALLOC_FREE) 551 1.17 tls wrterror("(ES): allocated non-free page on free-list\n"); 552 1.17 tls #endif /* EXTRA_SANITY */ 553 1.17 tls 554 1.17 tls size >>= malloc_pageshift; 555 1.17 tls 556 1.17 tls /* Map new pages */ 557 1.17 tls if (!p) 558 1.17 tls p = map_pages(size); 559 1.17 tls 560 1.17 tls if (p) { 561 1.17 tls 562 1.17 tls index = ptr2index(p); 563 1.17 tls page_dir[index] = MALLOC_FIRST; 564 1.17 tls for (i=1;i<size;i++) 565 1.17 tls page_dir[index+i] = MALLOC_FOLLOW; 566 1.17 tls 567 1.17 tls if (malloc_junk) 568 1.17 tls memset(p, SOME_JUNK, size << malloc_pageshift); 569 1.17 tls } 570 1.17 tls 571 1.17 tls if (delay_free) { 572 1.17 tls if (!px) 573 1.17 tls px = delay_free; 574 1.17 tls else 575 1.17 tls ifree(delay_free); 576 1.17 tls } 577 1.17 tls 578 1.17 tls return p; 579 1.17 tls } 580 1.17 tls 581 1.17 tls /* 582 1.17 tls * Allocate a page of fragments 583 1.17 tls */ 584 1.17 tls 585 1.17 tls static __inline__ int 586 1.17 tls malloc_make_chunks(int bits) 587 1.17 tls { 588 1.17 tls struct pginfo *bp; 589 1.17 tls void *pp; 590 1.17 tls int i, k, l; 591 1.17 tls 592 1.17 tls /* Allocate a new bucket */ 593 1.17 tls pp = malloc_pages(malloc_pagesize); 594 1.17 tls if (!pp) 595 1.17 tls return 0; 596 1.17 tls 597 1.17 tls /* Find length of admin structure */ 598 1.17 tls l = offsetof(struct pginfo, bits[0]); 599 1.17 tls l += sizeof bp->bits[0] * 600 1.17 tls (((malloc_pagesize >> bits)+MALLOC_BITS-1) / MALLOC_BITS); 601 1.17 tls 602 1.17 tls /* Don't waste more than two chunks on this */ 603 1.17 tls if ((1<<(bits)) <= l+l) { 604 1.17 tls bp = (struct pginfo *)pp; 605 1.17 tls } else { 606 1.17 tls bp = (struct pginfo *)imalloc(l); 607 1.17 tls if (!bp) { 608 1.17 tls ifree(pp); 609 1.17 tls return 0; 610 1.1 cgd } 611 1.17 tls } 612 1.17 tls 613 1.17 tls bp->size = (1<<bits); 614 1.17 tls bp->shift = bits; 615 1.17 tls bp->total = bp->free = malloc_pagesize >> bits; 616 1.17 tls bp->page = pp; 617 1.17 tls 618 1.17 tls /* set all valid bits in the bitmap */ 619 1.17 tls k = bp->total; 620 1.17 tls i = 0; 621 1.17 tls 622 1.17 tls /* Do a bunch at a time */ 623 1.17 tls for(;k-i >= MALLOC_BITS; i += MALLOC_BITS) 624 1.17 tls bp->bits[i / MALLOC_BITS] = ~0; 625 1.17 tls 626 1.17 tls for(; i < k; i++) 627 1.17 tls bp->bits[i/MALLOC_BITS] |= 1<<(i%MALLOC_BITS); 628 1.17 tls 629 1.17 tls if (bp == bp->page) { 630 1.17 tls /* Mark the ones we stole for ourselves */ 631 1.17 tls for(i=0;l > 0;i++) { 632 1.17 tls bp->bits[i/MALLOC_BITS] &= ~(1<<(i%MALLOC_BITS)); 633 1.17 tls bp->free--; 634 1.17 tls bp->total--; 635 1.17 tls l -= (1 << bits); 636 1.1 cgd } 637 1.17 tls } 638 1.17 tls 639 1.17 tls /* MALLOC_LOCK */ 640 1.17 tls 641 1.17 tls page_dir[ptr2index(pp)] = bp; 642 1.17 tls 643 1.17 tls bp->next = page_dir[bits]; 644 1.17 tls page_dir[bits] = bp; 645 1.17 tls 646 1.17 tls /* MALLOC_UNLOCK */ 647 1.17 tls 648 1.17 tls return 1; 649 1.1 cgd } 650 1.1 cgd 651 1.1 cgd /* 652 1.17 tls * Allocate a fragment 653 1.1 cgd */ 654 1.17 tls static void * 655 1.17 tls malloc_bytes(size_t size) 656 1.1 cgd { 657 1.17 tls int i,j; 658 1.17 tls u_int u; 659 1.17 tls struct pginfo *bp; 660 1.17 tls int k; 661 1.17 tls u_int *lp; 662 1.17 tls 663 1.17 tls /* Don't bother with anything less than this */ 664 1.17 tls if (size < malloc_minsize) 665 1.17 tls size = malloc_minsize; 666 1.17 tls 667 1.17 tls /* Find the right bucket */ 668 1.17 tls j = 1; 669 1.17 tls i = size-1; 670 1.17 tls while (i >>= 1) 671 1.17 tls j++; 672 1.17 tls 673 1.17 tls /* If it's empty, make a page more of that size chunks */ 674 1.17 tls if (!page_dir[j] && !malloc_make_chunks(j)) 675 1.17 tls return 0; 676 1.17 tls 677 1.17 tls bp = page_dir[j]; 678 1.17 tls 679 1.17 tls /* Find first word of bitmap which isn't empty */ 680 1.17 tls for (lp = bp->bits; !*lp; lp++) 681 1.17 tls ; 682 1.17 tls 683 1.17 tls /* Find that bit, and tweak it */ 684 1.17 tls u = 1; 685 1.17 tls k = 0; 686 1.17 tls while (!(*lp & u)) { 687 1.17 tls u += u; 688 1.17 tls k++; 689 1.17 tls } 690 1.17 tls *lp ^= u; 691 1.17 tls 692 1.17 tls /* If there are no more free, remove from free-list */ 693 1.17 tls if (!--bp->free) { 694 1.17 tls page_dir[j] = bp->next; 695 1.17 tls bp->next = 0; 696 1.17 tls } 697 1.17 tls 698 1.17 tls /* Adjust to the real offset of that chunk */ 699 1.17 tls k += (lp-bp->bits)*MALLOC_BITS; 700 1.17 tls k <<= bp->shift; 701 1.17 tls 702 1.17 tls if (malloc_junk) 703 1.17 tls memset((u_char*)bp->page + k, SOME_JUNK, bp->size); 704 1.1 cgd 705 1.17 tls return (u_char *)bp->page + k; 706 1.1 cgd } 707 1.1 cgd 708 1.17 tls /* 709 1.17 tls * Allocate a piece of memory 710 1.17 tls */ 711 1.17 tls static void * 712 1.17 tls imalloc(size_t size) 713 1.17 tls { 714 1.17 tls void *result; 715 1.17 tls 716 1.17 tls if (suicide) 717 1.17 tls abort(); 718 1.17 tls 719 1.17 tls if ((size + malloc_pagesize) < size) /* Check for overflow */ 720 1.17 tls result = 0; 721 1.17 tls else if (size <= malloc_maxsize) 722 1.17 tls result = malloc_bytes(size); 723 1.17 tls else 724 1.17 tls result = malloc_pages(size); 725 1.17 tls 726 1.17 tls if (malloc_abort && !result) 727 1.17 tls wrterror("allocation failed.\n"); 728 1.17 tls 729 1.17 tls if (malloc_zero && result) 730 1.17 tls memset(result, 0, size); 731 1.17 tls 732 1.17 tls return result; 733 1.1 cgd } 734 1.1 cgd 735 1.1 cgd /* 736 1.17 tls * Change the size of an allocation. 737 1.1 cgd */ 738 1.17 tls static void * 739 1.17 tls irealloc(void *ptr, size_t size) 740 1.17 tls { 741 1.17 tls void *p; 742 1.17 tls u_long osize, index; 743 1.17 tls struct pginfo **mp; 744 1.17 tls int i; 745 1.17 tls 746 1.17 tls if (suicide) 747 1.17 tls abort(); 748 1.17 tls 749 1.17 tls index = ptr2index(ptr); 750 1.1 cgd 751 1.17 tls if (index < malloc_pageshift) { 752 1.17 tls wrtwarning("junk pointer, too low to make sense.\n"); 753 1.17 tls return 0; 754 1.17 tls } 755 1.17 tls 756 1.17 tls if (index > last_index) { 757 1.17 tls wrtwarning("junk pointer, too high to make sense.\n"); 758 1.17 tls return 0; 759 1.17 tls } 760 1.17 tls 761 1.17 tls mp = &page_dir[index]; 762 1.17 tls 763 1.17 tls if (*mp == MALLOC_FIRST) { /* Page allocation */ 764 1.17 tls 765 1.17 tls /* Check the pointer */ 766 1.17 tls if ((u_long)ptr & malloc_pagemask) { 767 1.17 tls wrtwarning("modified (page-) pointer.\n"); 768 1.17 tls return 0; 769 1.17 tls } 770 1.17 tls 771 1.17 tls /* Find the size in bytes */ 772 1.17 tls for (osize = malloc_pagesize; *++mp == MALLOC_FOLLOW;) 773 1.17 tls osize += malloc_pagesize; 774 1.17 tls 775 1.17 tls if (!malloc_realloc && /* unless we have to, */ 776 1.17 tls size <= osize && /* .. or are too small, */ 777 1.17 tls size > (osize - malloc_pagesize)) { /* .. or can free a page, */ 778 1.17 tls return ptr; /* don't do anything. */ 779 1.6 jtc } 780 1.17 tls 781 1.17 tls } else if (*mp >= MALLOC_MAGIC) { /* Chunk allocation */ 782 1.17 tls 783 1.17 tls /* Check the pointer for sane values */ 784 1.17 tls if (((u_long)ptr & ((*mp)->size-1))) { 785 1.17 tls wrtwarning("modified (chunk-) pointer.\n"); 786 1.17 tls return 0; 787 1.1 cgd } 788 1.17 tls 789 1.17 tls /* Find the chunk index in the page */ 790 1.17 tls i = ((u_long)ptr & malloc_pagemask) >> (*mp)->shift; 791 1.17 tls 792 1.17 tls /* Verify that it isn't a free chunk already */ 793 1.17 tls if ((*mp)->bits[i/MALLOC_BITS] & (1<<(i%MALLOC_BITS))) { 794 1.17 tls wrtwarning("chunk is already free.\n"); 795 1.17 tls return 0; 796 1.16 kleink } 797 1.17 tls 798 1.17 tls osize = (*mp)->size; 799 1.17 tls 800 1.17 tls if (!malloc_realloc && /* Unless we have to, */ 801 1.17 tls size < osize && /* ..or are too small, */ 802 1.17 tls (size > osize/2 || /* ..or could use a smaller size, */ 803 1.17 tls osize == malloc_minsize)) { /* ..(if there is one) */ 804 1.17 tls return ptr; /* ..Don't do anything */ 805 1.1 cgd } 806 1.17 tls 807 1.17 tls } else { 808 1.17 tls wrtwarning("pointer to wrong page.\n"); 809 1.17 tls return 0; 810 1.17 tls } 811 1.17 tls 812 1.17 tls p = imalloc(size); 813 1.17 tls 814 1.17 tls if (p) { 815 1.17 tls /* copy the lesser of the two sizes, and free the old one */ 816 1.17 tls if (!size || !osize) 817 1.17 tls ; 818 1.17 tls else if (osize < size) 819 1.17 tls memcpy(p, ptr, osize); 820 1.17 tls else 821 1.17 tls memcpy(p, ptr, size); 822 1.17 tls ifree(ptr); 823 1.17 tls } 824 1.17 tls return p; 825 1.1 cgd } 826 1.1 cgd 827 1.1 cgd /* 828 1.17 tls * Free a sequence of pages 829 1.1 cgd */ 830 1.17 tls 831 1.17 tls static __inline__ void 832 1.17 tls free_pages(void *ptr, int index, struct pginfo *info) 833 1.17 tls { 834 1.17 tls int i; 835 1.17 tls struct pgfree *pf, *pt=0; 836 1.17 tls u_long l; 837 1.17 tls void *tail; 838 1.17 tls 839 1.17 tls if (info == MALLOC_FREE) { 840 1.17 tls wrtwarning("page is already free.\n"); 841 1.17 tls return; 842 1.17 tls } 843 1.17 tls 844 1.17 tls if (info != MALLOC_FIRST) { 845 1.17 tls wrtwarning("pointer to wrong page.\n"); 846 1.17 tls return; 847 1.17 tls } 848 1.17 tls 849 1.17 tls if ((u_long)ptr & malloc_pagemask) { 850 1.17 tls wrtwarning("modified (page-) pointer.\n"); 851 1.17 tls return; 852 1.17 tls } 853 1.17 tls 854 1.17 tls /* Count how many pages and mark them free at the same time */ 855 1.17 tls page_dir[index] = MALLOC_FREE; 856 1.17 tls for (i = 1; page_dir[index+i] == MALLOC_FOLLOW; i++) 857 1.17 tls page_dir[index + i] = MALLOC_FREE; 858 1.17 tls 859 1.17 tls l = i << malloc_pageshift; 860 1.17 tls 861 1.17 tls if (malloc_junk) 862 1.17 tls memset(ptr, SOME_JUNK, l); 863 1.17 tls 864 1.17 tls if (malloc_hint) 865 1.17 tls madvise(ptr, l, MADV_FREE); 866 1.17 tls 867 1.17 tls tail = (char *)ptr+l; 868 1.17 tls 869 1.17 tls /* add to free-list */ 870 1.17 tls if (!px) 871 1.17 tls px = imalloc(sizeof *pt); /* This cannot fail... */ 872 1.17 tls px->page = ptr; 873 1.17 tls px->end = tail; 874 1.17 tls px->size = l; 875 1.17 tls if (!free_list.next) { 876 1.17 tls 877 1.17 tls /* Nothing on free list, put this at head */ 878 1.17 tls px->next = free_list.next; 879 1.17 tls px->prev = &free_list; 880 1.17 tls free_list.next = px; 881 1.17 tls pf = px; 882 1.17 tls px = 0; 883 1.17 tls 884 1.17 tls } else { 885 1.17 tls 886 1.17 tls /* Find the right spot, leave pf pointing to the modified entry. */ 887 1.17 tls tail = (char *)ptr+l; 888 1.17 tls 889 1.17 tls for(pf = free_list.next; pf->end < ptr && pf->next; pf = pf->next) 890 1.17 tls ; /* Race ahead here */ 891 1.17 tls 892 1.17 tls if (pf->page > tail) { 893 1.17 tls /* Insert before entry */ 894 1.17 tls px->next = pf; 895 1.17 tls px->prev = pf->prev; 896 1.17 tls pf->prev = px; 897 1.17 tls px->prev->next = px; 898 1.17 tls pf = px; 899 1.17 tls px = 0; 900 1.17 tls } else if (pf->end == ptr ) { 901 1.17 tls /* Append to the previous entry */ 902 1.17 tls pf->end = (char *)pf->end + l; 903 1.17 tls pf->size += l; 904 1.17 tls if (pf->next && pf->end == pf->next->page ) { 905 1.17 tls /* And collapse the next too. */ 906 1.17 tls pt = pf->next; 907 1.17 tls pf->end = pt->end; 908 1.17 tls pf->size += pt->size; 909 1.17 tls pf->next = pt->next; 910 1.17 tls if (pf->next) 911 1.17 tls pf->next->prev = pf; 912 1.17 tls } 913 1.17 tls } else if (pf->page == tail) { 914 1.17 tls /* Prepend to entry */ 915 1.17 tls pf->size += l; 916 1.17 tls pf->page = ptr; 917 1.17 tls } else if (!pf->next) { 918 1.17 tls /* Append at tail of chain */ 919 1.17 tls px->next = 0; 920 1.17 tls px->prev = pf; 921 1.17 tls pf->next = px; 922 1.17 tls pf = px; 923 1.17 tls px = 0; 924 1.17 tls } else { 925 1.17 tls wrterror("freelist is destroyed.\n"); 926 1.1 cgd } 927 1.17 tls } 928 1.17 tls 929 1.17 tls /* Return something to OS ? */ 930 1.17 tls if (!pf->next && /* If we're the last one, */ 931 1.17 tls pf->size > malloc_cache && /* ..and the cache is full, */ 932 1.17 tls pf->end == malloc_brk && /* ..and none behind us, */ 933 1.17 tls malloc_brk == sbrk(0)) { /* ..and it's OK to do... */ 934 1.17 tls 935 1.17 tls /* 936 1.17 tls * Keep the cache intact. Notice that the '>' above guarantees that 937 1.17 tls * the pf will always have at least one page afterwards. 938 1.17 tls */ 939 1.17 tls pf->end = (char *)pf->page + malloc_cache; 940 1.17 tls pf->size = malloc_cache; 941 1.17 tls 942 1.17 tls brk(pf->end); 943 1.17 tls malloc_brk = pf->end; 944 1.17 tls 945 1.17 tls index = ptr2index(pf->end); 946 1.17 tls last_index = index - 1; 947 1.17 tls 948 1.17 tls for(i=index;i <= last_index;) 949 1.17 tls page_dir[i++] = MALLOC_NOT_MINE; 950 1.17 tls 951 1.17 tls /* XXX: We could realloc/shrink the pagedir here I guess. */ 952 1.17 tls } 953 1.17 tls if (pt) 954 1.17 tls ifree(pt); 955 1.1 cgd } 956 1.1 cgd 957 1.1 cgd /* 958 1.17 tls * Free a chunk, and possibly the page it's on, if the page becomes empty. 959 1.1 cgd */ 960 1.17 tls 961 1.17 tls static __inline__ void 962 1.17 tls free_bytes(void *ptr, int index, struct pginfo *info) 963 1.17 tls { 964 1.17 tls int i; 965 1.17 tls struct pginfo **mp; 966 1.17 tls void *vp; 967 1.17 tls 968 1.17 tls /* Find the chunk number on the page */ 969 1.17 tls i = ((u_long)ptr & malloc_pagemask) >> info->shift; 970 1.17 tls 971 1.17 tls if (((u_long)ptr & (info->size-1))) { 972 1.17 tls wrtwarning("modified (chunk-) pointer.\n"); 973 1.17 tls return; 974 1.17 tls } 975 1.17 tls 976 1.17 tls if (info->bits[i/MALLOC_BITS] & (1<<(i%MALLOC_BITS))) { 977 1.17 tls wrtwarning("chunk is already free.\n"); 978 1.17 tls return; 979 1.17 tls } 980 1.17 tls 981 1.17 tls if (malloc_junk) 982 1.17 tls memset(ptr, SOME_JUNK, info->size); 983 1.17 tls 984 1.17 tls info->bits[i/MALLOC_BITS] |= 1<<(i%MALLOC_BITS); 985 1.17 tls info->free++; 986 1.17 tls 987 1.17 tls mp = page_dir + info->shift; 988 1.17 tls 989 1.17 tls if (info->free == 1) { 990 1.17 tls 991 1.17 tls /* Page became non-full */ 992 1.17 tls 993 1.17 tls mp = page_dir + info->shift; 994 1.17 tls /* Insert in address order */ 995 1.17 tls while (*mp && (*mp)->next && (*mp)->next->page < info->page) 996 1.17 tls mp = &(*mp)->next; 997 1.17 tls info->next = *mp; 998 1.17 tls *mp = info; 999 1.17 tls return; 1000 1.17 tls } 1001 1.17 tls 1002 1.17 tls if (info->free != info->total) 1003 1.17 tls return; 1004 1.17 tls 1005 1.17 tls /* Find & remove this page in the queue */ 1006 1.17 tls while (*mp != info) { 1007 1.17 tls mp = &((*mp)->next); 1008 1.17 tls #ifdef EXTRA_SANITY 1009 1.17 tls if (!*mp) 1010 1.17 tls wrterror("(ES): Not on queue\n"); 1011 1.17 tls #endif /* EXTRA_SANITY */ 1012 1.17 tls } 1013 1.17 tls *mp = info->next; 1014 1.17 tls 1015 1.17 tls /* Free the page & the info structure if need be */ 1016 1.17 tls page_dir[ptr2index(info->page)] = MALLOC_FIRST; 1017 1.17 tls vp = info->page; /* Order is important ! */ 1018 1.17 tls if(vp != (void*)info) 1019 1.17 tls ifree(info); 1020 1.17 tls ifree(vp); 1021 1.17 tls } 1022 1.17 tls 1023 1.17 tls static void 1024 1.17 tls ifree(void *ptr) 1025 1.17 tls { 1026 1.17 tls struct pginfo *info; 1027 1.17 tls int index; 1028 1.17 tls 1029 1.17 tls /* This is legal */ 1030 1.17 tls if (!ptr) 1031 1.17 tls return; 1032 1.17 tls 1033 1.17 tls if (!malloc_started) { 1034 1.17 tls wrtwarning("malloc() has never been called.\n"); 1035 1.17 tls return; 1036 1.17 tls } 1037 1.17 tls 1038 1.17 tls /* If we're already sinking, don't make matters any worse. */ 1039 1.17 tls if (suicide) 1040 1.17 tls return; 1041 1.17 tls 1042 1.17 tls index = ptr2index(ptr); 1043 1.17 tls 1044 1.17 tls if (index < malloc_pageshift) { 1045 1.17 tls wrtwarning("junk pointer, too low to make sense.\n"); 1046 1.17 tls return; 1047 1.17 tls } 1048 1.17 tls 1049 1.17 tls if (index > last_index) { 1050 1.17 tls wrtwarning("junk pointer, too high to make sense.\n"); 1051 1.17 tls return; 1052 1.17 tls } 1053 1.17 tls 1054 1.17 tls info = page_dir[index]; 1055 1.17 tls 1056 1.17 tls if (info < MALLOC_MAGIC) 1057 1.17 tls free_pages(ptr, index, info); 1058 1.17 tls else 1059 1.17 tls free_bytes(ptr, index, info); 1060 1.17 tls return; 1061 1.17 tls } 1062 1.17 tls 1063 1.17 tls /* 1064 1.17 tls * These are the public exported interface routines. 1065 1.17 tls */ 1066 1.17 tls 1067 1.17 tls 1068 1.17 tls void * 1069 1.17 tls malloc(size_t size) 1070 1.17 tls { 1071 1.17 tls register void *r; 1072 1.17 tls 1073 1.17 tls THREAD_LOCK(); 1074 1.17 tls malloc_func = " in malloc():"; 1075 1.17 tls if (malloc_active++) { 1076 1.17 tls wrtwarning("recursive call.\n"); 1077 1.17 tls malloc_active--; 1078 1.17 tls return (0); 1079 1.17 tls } 1080 1.17 tls if (!malloc_started) 1081 1.17 tls malloc_init(); 1082 1.17 tls if (malloc_sysv && !size) 1083 1.17 tls r = 0; 1084 1.17 tls else 1085 1.17 tls r = imalloc(size); 1086 1.17 tls UTRACE(0, size, r); 1087 1.17 tls malloc_active--; 1088 1.17 tls THREAD_UNLOCK(); 1089 1.17 tls if (malloc_xmalloc && !r) 1090 1.17 tls wrterror("out of memory.\n"); 1091 1.17 tls return (r); 1092 1.17 tls } 1093 1.17 tls 1094 1.9 christos void 1095 1.17 tls free(void *ptr) 1096 1.1 cgd { 1097 1.17 tls THREAD_LOCK(); 1098 1.17 tls malloc_func = " in free():"; 1099 1.17 tls if (malloc_active++) { 1100 1.17 tls wrtwarning("recursive call.\n"); 1101 1.17 tls malloc_active--; 1102 1.17 tls return; 1103 1.17 tls } else { 1104 1.17 tls ifree(ptr); 1105 1.17 tls UTRACE(ptr, 0, 0); 1106 1.17 tls } 1107 1.17 tls malloc_active--; 1108 1.17 tls THREAD_UNLOCK(); 1109 1.17 tls return; 1110 1.17 tls } 1111 1.17 tls 1112 1.17 tls void * 1113 1.17 tls realloc(void *ptr, size_t size) 1114 1.17 tls { 1115 1.17 tls register void *r; 1116 1.17 tls 1117 1.17 tls THREAD_LOCK(); 1118 1.17 tls malloc_func = " in realloc():"; 1119 1.17 tls if (malloc_active++) { 1120 1.17 tls wrtwarning("recursive call.\n"); 1121 1.17 tls malloc_active--; 1122 1.17 tls return (0); 1123 1.17 tls } 1124 1.17 tls if (ptr && !malloc_started) { 1125 1.17 tls wrtwarning("malloc() has never been called.\n"); 1126 1.17 tls ptr = 0; 1127 1.17 tls } 1128 1.17 tls if (!malloc_started) 1129 1.17 tls malloc_init(); 1130 1.17 tls if (malloc_sysv && !size) { 1131 1.17 tls ifree(ptr); 1132 1.17 tls r = 0; 1133 1.17 tls } else if (!ptr) { 1134 1.17 tls r = imalloc(size); 1135 1.17 tls } else { 1136 1.17 tls r = irealloc(ptr, size); 1137 1.17 tls } 1138 1.17 tls UTRACE(ptr, size, r); 1139 1.17 tls malloc_active--; 1140 1.17 tls THREAD_UNLOCK(); 1141 1.17 tls if (malloc_xmalloc && !r) 1142 1.17 tls wrterror("out of memory.\n"); 1143 1.17 tls return (r); 1144 1.1 cgd } 1145
Indexes created Sat Sep 20 22:09:52 GMT 2025