S01_PLIKI_02

/*
Stwórz plik tekstowy wielkości 512 bajtów, z „dziurą” w środku.
*/

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

#define PATHNAME "02_file"
#define FILESIZE 512

int main(void)
{
    int fd;
    struct stat stat_buffer;

    if((fd = open(PATHNAME, O_CREAT | O_TRUNC | O_WRONLY, 0600)) == -1) {
        perror("open");
        return EXIT_FAILURE;
    }

    if(lseek(fd, FILESIZE-1, SEEK_SET) == -1) {
        perror("lseek");
        return EXIT_FAILURE;
    }

    if(write(fd, "", 1) == -1) {
        perror("write");
        return EXIT_FAILURE;
    }

    if(stat(PATHNAME, &stat_buffer) == -1) {
        perror("stat");
        return EXIT_FAILURE;
    }

    printf("Utworzono plik o: %ld B, zajmuje %ld sektorow\n", (long)stat_buffer.st_size, (long)stat_buffer.st_blocks);

    if(close(fd) == -1) {
        perror("close");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}