1 #include <stdio.h> 2 #include "tests/sys_mman.h" 3 #include <stdlib.h> 4 #include <unistd.h> 5 6 static unsigned int pagesize; 7 8 #define PAGES 1024u 9 #define LEN (PAGES*pagesize) 10 11 static void *domap(void) 12 { 13 void *ret = mmap(0, LEN, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 14 15 if (ret == (void *)-1) { 16 perror("mmap"); 17 exit(1); 18 } 19 20 return ret; 21 } 22 23 /* unmap in pieces to exercise munmap more */ 24 static void nibblemap(void *p) 25 { 26 int off; 27 int i; 28 29 off = (random() % LEN) & ~(pagesize-1); 30 31 for(i = 0; i < PAGES; i++) { 32 /* printf("unmapping off=%d\n", off/pagesize); */ 33 munmap((char *)p + off, pagesize); 34 off += 619*pagesize; 35 off %= LEN; 36 } 37 } 38 39 static void prmaps() 40 { 41 char buf[100]; 42 sprintf(buf, "/bin/cat /proc/%d/maps", getpid()); 43 system(buf); 44 exit(1); 45 } 46 47 int main() 48 { 49 int i; 50 void *expect1, *expect2; 51 52 pagesize = getpagesize(); 53 54 expect1 = domap(); 55 expect2 = domap(); 56 munmap(expect1, LEN); 57 munmap(expect2, LEN); 58 59 for(i = 0; i < 5; i++) { 60 void *m1, *m2; 61 62 m1 = domap(); 63 if (m1 != expect1) { 64 printf("FAIL i=%d: m1=%p expect1=%p\n", 65 i, m1, expect1); 66 prmaps(); 67 return 1; 68 } 69 m2 = domap(); 70 if (m2 != expect2) { 71 printf("FAIL i=%d: m2=%p expect2=%p\n", 72 i, m2, expect2); 73 prmaps(); 74 return 1; 75 } 76 nibblemap(m2); 77 munmap(m1, LEN); 78 } 79 80 printf("PASS\n"); 81 return 0; 82 } 83
