#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <time.h>
#include <string.h>
#include <stdbool.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/mman.h>
#define MSGLEN (16)

void checker(bool exp, const char *usrmsg, const char *file, const char *func, const int line){
    if(!(exp)){
        perror(usrmsg);
        fprintf(stderr, "%s %s %d\n", file, func, line);
        exit(EXIT_FAILURE);
    }
}
#define osAssert(exp, usrmsg) checker(exp, usrmsg, __FILE__, __func__, __LINE__);

void *getMemoryBlock(char *name, int *size){
    int memFD = shm_open(name, O_RDONLY, 0);
    osAssert(-1 != memFD, "shm open failed");

    struct stat finfo;
    osAssert(-1 != (fstat(memFD, &finfo)), "fstat fail");
    *size = finfo.st_size;

    void *address;
    osAssert(MAP_FAILED != (address = mmap(NULL, *size,
    PROT_READ, MAP_SHARED, memFD, 0)), "mmap failed");
    close(memFD);
    return address;

}

int main(int argc, char **argv){
    osAssert(2==argc, "nema argumenta");
    int size;
    int *array = getMemoryBlock(argv[1], &size);
    int n = size / sizeof(int);
    for(int i=0; i<n; i++){
        printf("%d\n", array[i]);
    }
    osAssert(-1 != munmap(array, size), "unmap failed");
    osAssert(-1 != shm_unlink(argv[1]),"unlink failed");
    return 0;

}