mapped.c

mapped.c

#include <fcntl.h>
#include <sys/mman.h>


typedef unsigned int uintf();


int main(int argc, char* argv[]) {
    int fd = open(argv[1], O_RDONLY);
    if (-1 == fd) {
        return 1;
    }
    uintf* f = mmap(
        0, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0);
    if (MAP_FAILED == f) {
        return 2;
    }
    unsigned int result = f();
    if (243 == result) {
        return 0;
    } else {
        return 3;
    }
}