the question is - why character 'a' isn't written!??!?!
#include <sys/mman.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
main() {
int ff=open("test",O_RDWR|O_CREAT,0666);
char *adr;
lseek(ff,1<<24,0);
write(ff,"",1);
adr=mmap(0,1<<24,PROT_READ|PROT_WRITE,MAP_NOCORE,ff,0);
if(adr==MAP_FAILED) { puts("error"); exit(1);}
printf("%08X\n",(unsigned)adr);
adr[8192]='a';
munmap(adr,1<<24);
close(ff);
};
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