1 /* $OpenBSD: mmap_fixed.c,v 1.1.1.1 2006/04/06 20:39:03 kurt Exp $ */ 2 3 /* 4 * Public domain. 2006, Kurt Miller <kurt@intricatesoftware.com> 5 */ 6 7 #include <sys/types.h> 8 #include <sys/mman.h> 9 #include <err.h> 10 11 #define MEM_SIZE 1024*1024 12 13 /* 14 * Repetitively call mmap with MMAP_FIXED on the same region of memory 15 * to ensure process datasize is properly calculated. 16 */ 17 18 int 19 main(void) 20 { 21 void *mem_area; 22 int i; 23 24 mem_area = mmap(0, MEM_SIZE, PROT_NONE, MAP_ANON, -1, 0); 25 26 for (i = 0; i < 20000; i++) { 27 if (mmap(mem_area, MEM_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, 28 MAP_ANON|MAP_FIXED, -1, 0) == MAP_FAILED) 29 err(1, NULL); 30 } 31 32 return (0); 33 } 34