1 #include <sys/mman.h> 2 #include <sys/types.h> 3 4 /* 5 * Allow old BSD naming too, it would be a pity to have to make a 6 * separate file just for this. 7 */ 8 #ifndef MAP_ANONYMOUS 9 #define MAP_ANONYMOUS MAP_ANON 10 #endif 11 12 /* 13 * Our blob allocator enforces the strict CHUNK size 14 * requirement, as a portability check. 15 */ 16 void *blob_alloc(unsigned long size) 17 { 18 void *ptr; 19 20 if (size & ~CHUNK) 21 die("internal error: bad allocation size (%lu bytes)", size); 22 ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 23 if (ptr == MAP_FAILED) 24 ptr = NULL; 25 return ptr; 26 } 27 28 void blob_free(void *addr, unsigned long size) 29 { 30 if (!size || (size & ~CHUNK) || ((unsigned long) addr & 512)) 31 die("internal error: bad blob free (%lu bytes at %p)", size, addr); 32 #ifndef DEBUG 33 munmap(addr, size); 34 #else 35 mprotect(addr, size, PROT_NONE); 36 #endif 37 } 38