linux spi can

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

int main() {
    int fd;
    struct spi_ioc_transfer tr;

    fd = open("/dev/spidev0.0", O_RDWR);
    if (fd < 0) {
        perror("Failed to open SPI device");
        return -1;
    }

    memset(&tr, 0, sizeof(tr));
    tr.tx_buf = (unsigned long)tx_buffer;
    tr.rx_buf = (unsigned long)rx_buffer;
    tr.len = 2;
    tr.speed_hz = 500000;
    tr.delay_usecs = 0;

    ioctl(fd, SPI_IOC_MESSAGE(1), &tr);

    close(fd);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/can.h>
#include <linux/can/raw.h>
#include <sys/socket.h>
#include <net/if.h>
#include <unistd.h>

int main() {
    int s;
    struct sockaddr_can addr;
    struct ifreq ifr;
    struct can_frame frame;

    s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
    strcpy(ifr.ifr_name, "can0");
    ioctl(s, SIOCGIFINDEX, &ifr);

    addr.can_family = AF_CAN;
    addr.can_ifindex = ifr.ifr_ifindex;

    bind(s, (struct sockaddr *)&addr, sizeof(addr));

    frame.can_id = 0x123;
    frame.can_dlc = 8;
    memset(frame.data, 0, 8);

    write(s, &frame, sizeof(struct can_frame));

    close(s);
    return 0;
}