#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/can.h> #include <linux/can/raw.h> #define CAN_INTERFACE "can0" // CAN接口名称 #define CAN_ID 0x123 // CAN ID int main(void) { int s; // socket描述符 struct sockaddr_can addr; struct ifreq ifr; struct can_frame frame; int nbytes; // 创建socket s = socket(PF_CAN, SOCK_RAW, CAN_RAW); if(s < 0) { perror("socket PF_CAN failed"); return 1; } // 设置CAN接口 strcpy(ifr.ifr_name, CAN_INTERFACE); ioctl(s, SIOCGIFINDEX, &ifr); addr.can_family = PF_CAN; addr.can_ifindex = ifr.ifr_ifindex; bind(s, (struct sockaddr *)&addr, sizeof(addr)); // 发送CAN数据 frame.can_id = CAN_ID; frame.can_dlc = 2; frame.data[0] = 0x01; frame.data[1] = 0x02; nbytes = write(s, &frame, sizeof(struct can_frame)); if(nbytes != sizeof(struct can_frame)) { perror("write failed"); close(s); return 1; } // 接收CAN数据 nbytes = read(s, &frame, sizeof(struct can_frame)); if(nbytes < 0) { perror("read failed"); close(s); return 1; } printf("can_id = 0x%X, can_dlc = %d, data = %02X %02X\n", frame.can_id, frame.can_dlc, frame.data[0], frame.data[1]); close(s); return 0; }这个代码gcc编译不过，重新写一下呢？

这段代码的问题在于缺少头文件的引用，需要添加以下头文件：

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>

另外，建议在使用 ioctl 函数时加上错误处理，修改后的代码如下：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/can.h>
#include <linux/can/raw.h>

#define CAN_INTERFACE "can0" // CAN接口名称
#define CAN_ID 0x123        // CAN ID

int main(void) {
    int s; // socket描述符
    struct sockaddr_can addr;
    struct ifreq ifr;
    struct can_frame frame;
    int nbytes;

    // 创建socket
    s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
    if(s < 0) {
        perror("socket PF_CAN failed");
        return 1;
    }

    // 设置CAN接口
    strcpy(ifr.ifr_name, CAN_INTERFACE);
    if(ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
        perror("ioctl failed");
        close(s);
        return 1;
    }
    addr.can_family = PF_CAN;
    addr.can_ifindex = ifr.ifr_ifindex;
    if(bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
        perror("bind failed");
        close(s);
        return 1;
    }

    // 发送CAN数据
    frame.can_id = CAN_ID;
    frame.can_dlc = 2;
    frame.data[0] = 0x01;
    frame.data[1] = 0x02;
    nbytes = write(s, &frame, sizeof(struct can_frame));
    if(nbytes != sizeof(struct can_frame)) {
        perror("write failed");
        close(s);
        return 1;
    }

    // 接收CAN数据
    nbytes = read(s, &frame, sizeof(struct can_frame));
    if(nbytes < 0) {
        perror("read failed");
        close(s);
        return 1;
    }
    printf("can_id = 0x%X, can_dlc = %d, data = %02X %02X\n", 
            frame.can_id, frame.can_dlc, frame.data[0], frame.data[1]);

    close(s);
    return 0;
}