msg--->msg_sys--->msg_sys->msg_controllen--->ctl_len msg--->msg_sys->msg_control--->ctl_buf 利用流程: //限制: BUFF_SIZE > 44charbuff[BUFF_SIZE];structmsghdrmsg={0};structsockaddr_inaddr={0};intsockfd=socket(AF_INET,SOCK_DGRAM,0);addr.sin_addr.s_addr=htonl(INADDR_LOOPBACK...
intmsgsend(int msgid, const void *msg_ptr, size_t msg_sz, int msgflg); msgid是由msgget函数返回的消息队列标识符。 msg_ptr是一个指向准备发送消息的指针,但是消息的数据结构却有一定的要求,指针msg_ptr所指向的消息结构一定要是以一个长整型成员变量开始的结构体,接收函数将用这个成员来确定消息的类型。
int msgsend(int msgid, const void *msg_ptr, size_t msg_sz, int msgflg); msgid是由msgget函数返回的消息队列标识符。 msg_ptr是一个指向准备发送消息的指针,但是消息的数据结构却有一定的要求,指针msg_ptr所指向的消息结构一定要是以一个长整型成员变量开始的结构体,接收函数将用这个成员来确定消息的类型...
printf( "send oob data out\n" ); const char* oob_data = "abc"; const char* normal_data = "123"; send( sockfd, normal_data, strlen( normal_data ), 0 ); send( sockfd, oob_data, strlen( oob_data ), MSG_OOB ); send( sockfd, normal_data, strlen( normal_data ), 0 ); } ...
socket sock,struct msghdr msg,size_t size);而用户空间的函数sendmsg是直接调用的内核中的sock_sendmsg,ssize_t sendmsg(int sockfd,const struct msghdr msg,int flags);这两个函数同时支持tcp和udp ，当然还有别的像unix域等。struct msghdr { void msg_name;/ Address to send to/receive from...
cac9e44 ("io_uring/net: save msghdr->msg_control for retries") reinstatiates msg_control before every __sys_sendmsg_sock(), since the function can overwrite the value in msghdr. We need to do same for zerocopy sendmsg. Cc: stable@vger.kernel.org Fixes: 493108d ("io_uring/net: ...
send_buf = kmalloc(BULK_SIZE, GFP_KERNEL); if (!send_buf) { BT_ERR("Can't allocate memory chunk for firmware"); return -ENOMEM; } err = usb_control_msg_send(udev, 0, USB_REQ_DFU_DNLOAD, USB_TYPE_VENDOR, 0, 0, firmware->data, FW_HDR_SIZE, USB_CTRL_SET_TIMEOUT); if (er...
msg--->msg_sys->msg_control--->ctl_buf 利用流程: //限制: BUFF_SIZE > 44charbuff[BUFF_SIZE];structmsghdrmsg={0};structsockaddr_inaddr={0};intsockfd=socket(AF_INET,SOCK_DGRAM,0);addr.sin_addr.s_addr=htonl(INADDR_LOOPBACK);addr.sin_family=AF_INET;addr.sin_port=htons(6666);// ...
I am using VPP v21.06. Enabled linux-cp plugin. Created lcp as follows: vppctl lcp create tn-eth2 host-if vpp2 netns inline_mgt_net vppctl ip mroute add 224.0.0.0/24 via local Forward vppctl ip mroute add 224.0.0.0/24 via tn-eth2 Accept ...
really not send a signal if the URB completes successfully? The code in async_completed() seems to send the signal irrespective of the value in urb->status. Or maybe there is some other approach that I should be taking. Many thanks for any suggestions. ...