| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mman.h> |
| |
| int main(int argc, char **argv) |
| { |
| void *p1; |
| void *p2; |
| |
| if ( ( p1 = mmap( 0, 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0 ) ) == MAP_FAILED ) |
| { |
| perror( "mmap" ); |
| exit( 1 ); |
| } |
| |
| if ( munmap( p1, 4096 ) != 0 ) |
| { |
| perror( "munmap" ); |
| exit( 1 ); |
| } |
| |
| if ( ( p2 = mmap( p1 + 1, 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0 ) ) == MAP_FAILED ) |
| { |
| perror( "mmap" ); |
| exit( 1 ); |
| } |
| |
| if ( munmap( p2, 4096 ) != 0 ) |
| { |
| perror( "munmap" ); |
| exit( 1 ); |
| } |
| |
| if ( ( p2 = mmap( p1 + 1, 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0 ) ) == MAP_FAILED ) |
| { |
| perror( "mmap" ); |
| exit( 1 ); |
| } |
| |
| if ( munmap( p2, 4096 ) != 0 ) |
| { |
| perror( "munmap" ); |
| exit( 1 ); |
| } |
| |
| exit( 0 ); |
| } |