sendto的系统调用会发送一帧数据报到指定的地址,在CAN协议调用之前把该地址移到内核空间和检查用户空间数据域是否可读。 在net/socket.c源文件中,sendto函数的系统调用如下代码: SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, unsigned, flags, structsockaddr __user *, addr, int...
sockfd:通过socket函数生成的套接字描述符; msg:该指针指向需要发送数据的缓冲区; len:是发送数据的长度; to:目标主机的IP地址及端口号信息; sendto的系统调用会发送一帧数据报到指定的地址,在CAN协议调用之前把该地址移到内核空间和检查用户空间数据域是否可读。 在net/socket.c源文件中,sendto函数的系统调用如下...
recvmsg(s[i], &msg, 0); //或者recv() close(s[i]); ifr.ifr_ifindex = if_nametoindex(ifr.ifr_name); ioctl(s, SIOCGIFMTU, &ifr) bind(s, (struct sockaddr *)&addr, sizeof(addr) write(s, &frame, required_mtu) 由于linux暴露给上层的CAN网络设备只支持 socket(PF_CAN, SOCK_RAW, CA...
当使用recvmsg()时,msg->msg_flags可能会包含下面的标志 MSG_DONTROUTE 接受的数据帧被创建在本地主机上时设置 MSG_CONFIRM 广播协议套接字 SOCK_DGRAW 面向连接的传输协议 SOCK_SEQPACKET 非连接传输协议 SOCK_DGRAW CAN.KO -stats_timer: 为了计算 Socket CAN 核心模块的统计信息(例如,每秒帧数和每秒最大帧数...
对CAN设备的配置,首先需要打开CAN子系统,然后打开CAN设备驱动,其他还包括调试信息等。 Networking support ->CAN bus subsystem support ->Raw CAN Protocol (raw access with CAN-ID filtering)--支持BSD socket API方位CAN总线。 ->Broadcast Manager CAN Protocol (with content filtering)-- ...
ssize_t bytes_received = recvmsg(sock, &header, flags); if (bytes_received == -1) { throw_native_exception(env, "Unable to recvmsg from the socket"); @@ -213,7 +202,8 @@ JNIEXPORT jobject JNICALL Java_tel_schich_javacan_SocketCAN_receiveJ1939Message( parse_timestamp(cmsg, ×t...
RAW Socket Returned Message Flags When using recvmsg() call, the msg->msg_flags may contain following flags: MSG_DONTROUTE: set when the received frame was created on the local host. MSG_CONFIRM: set when the frame was sent via the socket it is received on. This flag can be interprete...
obj->s = socket(PF_CAN, SOCK_RAW, CAN_RAW); if (obj->s < 0) { perror("socket"); return 1; } event_setup.data.ptr = obj; /* remember the instance as private data */ if (epoll_ctl(fd_epoll, EPOLL_CTL_ADD, obj->s, &event_setup)) { ...
int ret; /* open socket */ priv->sock = socket(PF_CAN, SOCK_DGRAM, CAN_J1939); if (priv->sock < 0) { warn("socket(j1939)"); return EXIT_FAILURE; } if (priv->todo_prio >= 0) { ret = setsockopt(priv->sock, SOL_CAN_J1939, SO_J1939_SEND_PRIO, ...
5 SocketCAN核心模块 5.1 can.ko模块参数 5.2 procfs内容 5.3编写自己的CAN协议模块 6 CAN网络驱动程序 6.1常规设置 6.2发送帧的本地环回 6.3 CAN控制器硬件过滤器 6.4 虚拟CAN驱动程序(vcan) 6.5 CAN网络设备驱动程序接口 6.5.1 Netlink界面,用于设置/获取设备属性 ...