1 #include <stdio.h> 2 #include <stdlib.h> 3 #include "tests/sys_mman.h" 4 5 int main(int argc, char **argv) 6 { 7 void *p1; 8 void *p2; 9 10 if ( ( p1 = mmap( 0, 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0 ) ) == MAP_FAILED ) 11 { 12 perror( "aligned mmap failed" ); 13 exit( 1 ); 14 } 15 16 if ( munmap( p1, 4096 ) != 0 ) 17 { 18 perror( "aligned munmap failed" ); 19 exit( 1 ); 20 } 21 22 // This fails because MAP_FIXED is specified and p1+1 isn't page-aligned. 23 // (On Linux, just non-page-alignment is enough for failure, but on Darwin 24 // MAP_FIXED has to also be specified.) 25 if ( ( p2 = mmap( p1 + 1, 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0 ) ) == MAP_FAILED ) 26 { 27 perror( "unaligned mmap failed" ); 28 exit( 1 ); 29 } 30 31 if ( munmap( p2, 4096 ) != 0 ) 32 { 33 perror( "unaligned munmap failed" ); 34 exit( 1 ); 35 } 36 37 exit( 0 ); 38 } 39
