记得以前有些朋友讨论过,socket虽然send成功了,但是其实只是发送到数据缓冲区里面了,而并没有真正的在物理设备上发送出去;而通过这条语句,将发送缓冲区设置为0,即屏蔽掉发送缓冲以后,一旦send返回(当然是就阻塞套结字来说),就可以肯定数据已经在发送的途中了^_^,但是这样做也许会影响系统的性能 to:Sander() UDP...
48 /* change the send buffer size */ 49 getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&n, &alen); 50 printf("SEND buffer size: %d\n", n); 51 getsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, (char *)&n, &alen); 52 printf("SEND LOWAT size: %d\n", n); 53 if (setsockopt(fd, ...
1)bytes = struct.pack(format, values) 描述: pack() --> 把"int类型的数据"打包成一个"4bytes字符串" 参数: format --> 数据格式(类型),在这里我们指定该格式为"i"(即int数据类型). values --> 整数 返回值: 4bytes字符串 2)(values,) = struct.unpack(format, bytes) 描述: unpack() --> ...
43 /* initialize the send buffer */ 44 buf = malloc(n_to_send * sizeof(char)); 45 for (i = 0; i < n_to_send; i++) 46 buf[i] = '='; 47 48 /* change the send buffer size */ 49 getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&n, &alen); 50 printf("SEND buffer...
前言:本文是socket-send发送源码分析文章的子篇,主要分析 tcp_sendmsg_locked 这个函数的源码逻辑。 对应实际调用代码:tcp_sendmsg # tcp_sendmsg_locked net\ipv4\tcp_ipv4.c # 3310 行 struct proto tcp_prot…
maximum send buffer sizes that can be set usingsetsockopt(), in bytes tcp_moderate_rcvbuf https://man7.org/linux/man-pages/man7/tcp.7.html tcp_moderate_rcvbuf (Boolean; default: enabled; since Linux 2.4.17/2.6.7) If enabled, TCP performs receive buffer auto-tuning, ...
import socket # 创建一个socket对象 s1 = socket.socket() s1.connect(('127.0.0.1',9999)) # 不断发送和接收数据 while 1: send_data = input("客户端要发送的信息:") # socket传递的都是bytes类型的数据,需要转换一下 if send_data=="exit": info="exit" s1.send(info.encode()) break else: ...
int my_write(int fd,void *buffer,int length) { int bytes_left; int written_bytes; char *ptr; ptr=buffer; bytes_left=length; while(bytes_left>0) { written_bytes=write(fd,ptr,bytes_left); if(written_bytes<=0) { if(errno==EINTR) ...
Send may complete successfully even if it sends less than the number of bytes in the buffer. It...
// Displays sending with a connected socket // using the overload that takes a buffer, offset, message size, and socket flags. public static int SendReceiveTest4(Socket server) { byte[] msg = Encoding.UTF8.GetBytes("This is a test"); byte[] bytes = new byte[256]; try { // Block...