19-0

#include <stdio.h>
#include <string.h>
#include <semaphore.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>

int main() {
    char* shm_name = NULL;
    char* sem_name = NULL;
    size_t shm_len, sem_len;
    size_t n;
    getdelim(&sem_name, &sem_len, ' ', stdin);
    sem_name[strlen(sem_name) - 1] = '\0';
    getdelim(&shm_name, &shm_len, ' ', stdin);
    shm_name[strlen(shm_name) - 1] = '\0';

    scanf("%zu", &n);

    sem_t* sem;
    if ((sem = sem_open(sem_name, 0)) == SEM_FAILED) {
        perror("sem_open");
        return 2;
    }
    sem_wait(sem);
    sem_close(sem);

    int fd = shm_open(shm_name, O_RDONLY, 0);
    if (fd == -1) {
        perror("shm_open");
        return 3;
    }
    int* array = mmap(NULL, sizeof(int) * n, PROT_READ, MAP_SHARED, fd, 0);
    for (size_t i = 0; i < n; ++i) {
        printf("%d\n", array[i]);
    }
}