如何以编程方式设置我的char设备的权限

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

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s<device_path>\n", argv[0]);
        return 1;
    }

    const char *device_path = argv[1];
    mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;

    int fd = open(device_path, O_RDWR);
    if (fd < 0) {
        perror("open");
        return 1;
    }

    int result = fchmod(fd, mode);
    if (result < 0) {
        perror("fchmod");
        close(fd);
        return 1;
    }

    close(fd);
    printf("Device permission set to %o\n", mode);
    return 0;
}

gcc -o set_device_permission set_device_permission.c

./set_device_permission /dev/your_char_device