linux读取磁盘扇区

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/fs.h>

#define SECTOR_SIZE 512

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <device> <sector_number>\n", argv[0]);
        return 1;
    }

    const char *device = argv[1];
    long sector_number = atol(argv[2]);

    int fd = open(device, O_RDONLY);
    if (fd == -1) {
        perror("Failed to open device");
        return 1;
    }

    lseek(fd, sector_number * SECTOR_SIZE, SEEK_SET);

    char buffer[SECTOR_SIZE];
    ssize_t bytes_read = read(fd, buffer, SECTOR_SIZE);
    if (bytes_read == -1) {
        perror("Failed to read sector");
        close(fd);
        return 1;
    }

    printf("Sector %ld:\n", sector_number);
    for (int i = 0; i < bytes_read; i++) {
        printf("%02x ", (unsigned char)buffer[i]);
        if ((i + 1) % 16 == 0) {
            printf("\n");
        }
    }

    close(fd);
    return 0;
}