music-player-fm/mpfm.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <libusb-1.0/libusb.h>
#include <libudev.h>
#include <string.h>

static int count = 0;

static struct udev_device* get_child(struct udev* udev, struct udev_device* parent, const char* subsystem)
{
    struct udev_device* child = NULL;
    struct udev_enumerate *enumerate = udev_enumerate_new(udev);

    udev_enumerate_add_match_parent(enumerate, parent);
    udev_enumerate_add_match_subsystem(enumerate, subsystem);
    udev_enumerate_scan_devices(enumerate);

    struct udev_list_entry *devices = udev_enumerate_get_list_entry(enumerate);
    struct udev_list_entry *entry;

    udev_list_entry_foreach(entry, devices) {
        const char *path = udev_list_entry_get_name(entry);
        printf("%s\n", path);  // DEBUG
        child = udev_device_new_from_syspath(udev, path);
        break;
    }

    udev_enumerate_unref(enumerate);
    return child;
}

void get_partition(uint16_t idVendor, uint16_t idProduct)
{
    struct udev *udev = udev_new();
    if (!udev) {
        printf("Error: Failed to initialize udev.\n");
        return;
    }

    struct udev_enumerate *enumerate = udev_enumerate_new(udev);

    udev_enumerate_add_match_subsystem(enumerate, "scsi");
    /* udev_enumerate_add_match_property(enumerate, "DEVTYPE", "scsi_target"); */
    udev_enumerate_scan_devices(enumerate);

    struct udev_list_entry *devices = udev_enumerate_get_list_entry(enumerate);
    struct udev_list_entry *entry;

    udev_list_entry_foreach(entry, devices) {
        const char *path = udev_list_entry_get_name(entry);
        printf("%s\n", path);  // DEBUG
        struct udev_device* scsi = udev_device_new_from_syspath(udev, path);

        struct udev_device* block = get_child(udev, scsi, "block");
        struct udev_device* scsi_disk = get_child(udev, scsi, "scsi_disk");

        struct udev_device* usb
            = udev_device_get_parent_with_subsystem_devtype(
                    scsi, "usb", "usb_device");

        /* if (block && scsi_disk && usb) { */
        printf("block = %s, usb = %s:%s, scsi = %s\n",
                udev_device_get_devnode(block),
                udev_device_get_sysattr_value(usb, "idVendor"),
                udev_device_get_sysattr_value(usb, "idProduct"),
                udev_device_get_sysattr_value(scsi, "vendor"));
        printf("  %s\n  %s\n",
                udev_device_get_sysattr_value(usb,"manufacturer"),
                udev_device_get_sysattr_value(usb,"product"));
        printf("  serial: %s\n",
                udev_device_get_sysattr_value(usb, "serial"));
        /* } */

        if (block)
            udev_device_unref(block);

        if (scsi_disk)
            udev_device_unref(scsi_disk);

        /* // Obtén el idVendor e idProduct del dispositivo USB actual */
        /* const char *vendor_id_str = udev_device_get_sysattr_value(dev, "idVendor"); */
        /* const char *product_id_str = udev_device_get_sysattr_value(dev, "idProduct"); */

        /* if (vendor_id_str && product_id_str) { */
        /*     uint16_t vendor_id = strtol(vendor_id_str, NULL, 16); */
        /*     uint16_t product_id = strtol(product_id_str, NULL, 16); */
        /*  */
        /*     if (vendor_id == idVendor && product_id == idProduct) { */
        /*         const char *partition = udev_device_get_devnode(dev); */
        /*         if (partition) { */
        /*             // Extraer el nombre de la partición */
        /*             const char *partition_name = strrchr(partition, '/'); */
        /*             if (partition_name) { */
        /*                 printf("Partition: %s\n", partition_name + 1); */
        /*             } else { */
        /*                 printf("Partition: %s\n", partition); */
        /*             } */
        /*         } else { */
        /*             printf("Error: Failed to get partition.\n"); */
        /*         } */
        /*         break; */
        /*     } */
        /* } */

        udev_device_unref(scsi);
    }

    udev_enumerate_unref(enumerate);
    udev_unref(udev);
}

    int
hotplug_callback(struct libusb_context *ctx, struct libusb_device *dev,
        libusb_hotplug_event event, void *user_data)
{
    static libusb_device_handle *dev_handle = NULL;
    struct libusb_device_descriptor desc;
    int rc;
    printf("Entering callback\n"); // DEBUG
    (void)libusb_get_device_descriptor(dev, &desc);

    printf("%04x:%04x (bus %d, device %d)\n",
            desc.idVendor, desc.idProduct,
            libusb_get_bus_number(dev), libusb_get_device_address(dev));

    if (LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED == event) {
        /* rc = libusb_open(dev, &dev_handle); */
        /* if (LIBUSB_SUCCESS != rc) { */
        /*     printf("Could not open USB device\n"); */
        /* } */

        // Obtén la partición del dispositivo
        get_partition(desc.idVendor, desc.idProduct);

    } else if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
        if (dev_handle) {
            libusb_close(dev_handle);
            dev_handle = NULL;
        }
    } else {
        printf("Unhandled event %d\n", event);
    }
    count++;

    return 0;
}

    int
main (void)
{
    libusb_hotplug_callback_handle callback_handle;
    int rc;

    libusb_init(NULL);

    rc = libusb_hotplug_register_callback(
            NULL,
            LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED | LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT,
            0,
            LIBUSB_HOTPLUG_MATCH_ANY,
            LIBUSB_HOTPLUG_MATCH_ANY,
            LIBUSB_HOTPLUG_MATCH_ANY,
            hotplug_callback,
            NULL,
            &callback_handle);
    if (LIBUSB_SUCCESS != rc) {
        printf("Error creating a hotplug callback\n");
        libusb_exit(NULL);
        return EXIT_FAILURE;
    }

    while (count < 2) {
        libusb_handle_events_completed(NULL, NULL);
        nanosleep(&(struct timespec){0, 10000000UL}, NULL);
    }

    libusb_hotplug_deregister_callback(NULL, callback_handle);
    libusb_exit(NULL);

    return 0;
}