c udp server client demo
server.c//
// Created by gxf on 2020/2/7.
//
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#define BUFFSIZE 1024
int main(){
int serverSocketFd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(1234);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int ret = bind(serverSocketFd, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
if (ret) {
fprintf(stderr, "bind fail");
exit(1);
}
struct sockaddr_in cliAddr;
socklen_t cliAddrLen = sizeof(cliAddr);
while (1) {
char buff;
int readCount = recvfrom(serverSocketFd, buff, BUFFSIZE, 0, (struct sockaddr*)&cliAddr, &cliAddrLen);
buff = '\0';
printf("Receive from client:%s\n", buff);
sendto(serverSocketFd, buff, BUFFSIZE, 0, (struct sockaddr *)&cliAddr, cliAddrLen);
}
return 0;
}
client.c
//
// Created by gxf on 2020/2/7.
//
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define BUFSIZE 1024
int main(){
int clientSocketFd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(1234);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
socklen_t addrLen = sizeof(serverAddr);
while (1) {
char buff;
printf("Enter msg send to server:");
scanf("%s", buff);
sendto(clientSocketFd, buff, BUFSIZE, 0, (struct sockaddr*)&serverAddr, addrLen);
int readCount = recvfrom(clientSocketFd, buff, BUFSIZE, 0, (struct sockaddr*)&serverAddr, &addrLen);
buff = '\0';
printf("Receive from server:%s\n", buff);
}
return 0;
}
文档来源：51CTO技术博客https://blog.51cto.com/u_2498536/3304158
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