linux ioctl 替代

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

int main() {
    int fd = open("/sys/class/gpio/export", O_WRONLY);
    if (fd == -1) {
        perror("Failed to open export file");
        return -1;
    }
    write(fd, "18", 2); // 导出 GPIO 18
    close(fd);
    return 0;
}

#include <libudev.h>
#include <stdio.h>

int main() {
    struct udev *udev;
    struct udev_enumerate *enumerate;
    struct udev_list_entry *devices, *entry;

    udev = udev_new();
    if (!udev) {
        printf("Can't create udev\n");
        return -1;
    }

    enumerate = udev_enumerate_new(udev);
    udev_enumerate_add_match_subsystem(enumerate, "block");
    udev_enumerate_scan_devices(enumerate);
    devices = udev_enumerate_get_list_entry(enumerate);

    udev_list_entry_foreach(entry, devices) {
        const char *path = udev_list_entry_get_name(entry);
        struct udev_device *dev = udev_device_new_from_syspath(udev, path);
        printf("Device Node Path: %s\n", udev_device_get_devnode(dev));
        udev_device_unref(dev);
    }

    udev_enumerate_unref(enumerate);
    udev_unref(udev);
    return 0;
}