so2 lab1 pb2

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>

#define BLOCK_SIZE (1 << 12)
#define AUX_SIZE 50

int openFile(const char path[], int flags, mode_t mode) {
    int fd = open(path, flags, mode);
    if (fd < 0) {
        perror("");
        exit(-1);
    }
    return fd;
}

void closeFile(int fd) {
    if (close(fd) == -1) {
        perror("");
        exit(-2);
    }
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Wrong usage!\n");
        exit(-1);
    }

    struct stat st;
    lstat(argv[1], &st);
    printf("%ld\n", st.st_size);
    if (S_ISDIR(st.st_mode)) puts("dir");
    else if (S_ISLNK(st.st_mode)) puts("link");
    else if (S_ISREG(st.st_mode)) puts("reg file");

    puts("user: ");
    printf("read: %d\n", (bool)(st.st_mode & S_IRUSR));
    printf("write: %d\n", (bool)(st.st_mode & S_IWUSR));
    printf("exec: %d\n", (bool)(st.st_mode & S_IXUSR));


    return 0;
}