Linux网络编程实现客户端服务端收发数据功能

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客户端代码

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(void){int st = socket(AF_INET, SOCK_STREAM, 0);//初始化socketstruct sockaddr_in addr; // 定义一个IP地址的结构memset(&addr, 0, sizeof(addr));addr.sin_family = AF_INET;// 设置结构地址类型为TCP/IP地址addr.sin_port = htons(8080); // 制定一个端口号：8080，htons：将short类型从host字节类型转到net字节类型// 将字符类型的IP地址转化为int，赋给addr结构//addr.sin_addr.s_addr = inet_addr("127.0.0.1");addr.sin_addr.s_addr = inet_addr("192.168.10.210");//if (connect(st, (struct sockaddr *)&addr, sizeof(addr)) == -1){printf("connect failed %s\n", strerror(errno));return EXIT_FAILURE;}char s[1024];memset(s, 0, sizeof(1024));strcpy(s, "hello world");if (send(st, s, strlen(s), 0) == -1){printf("send failed %s\n", strerror(errno));}//sleep(100);close(st);return EXIT_SUCCESS;}

服务端代码

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(int arg, char *args[]){int st = socket(AF_INET, SOCK_STREAM, 0); //初始化socketint on = 1;if (setsockopt(st, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1){printf("setsockopt failed %s\n", strerror(errno));return EXIT_FAILURE;}struct sockaddr_in addr; // 定义一个IP地址结构memset(&addr, 0, sizeof(addr));addr.sin_family = AF_INET; // 将addr结构的属性定位为TCP/IP地址addr.sin_port = htons(8080); // 将本地字节顺序转化为网络字节顺序addr.sin_addr.s_addr = htonl(INADDR_ANY); // INADDR_ANY代表这个server上所有的地址// 将ip与server程序绑定if (bind(st, (struct sockaddr *) &addr, sizeof(addr)) == -1){printf("bind failed %s\n", strerror(errno));return EXIT_FAILURE;}// server端开始listenif (listen(st, 20) == -1){printf("listen failed %s\n", strerror(errno));return EXIT_FAILURE;}//printf("listen success\n");char s[1024];int client_st = 0;struct sockaddr_in client_addr; // 表示client端的IP地址int i;for (i = 0; i < 5; i++){memset(&client_addr, 0, sizeof(client_addr));socklen_t len = sizeof(client_addr);// accept会阻塞，直到有客户端连接过来，accept返回client的socket描述符client_st = accept(st, (struct sockaddr*) &client_addr, &len);if (client_st == -1){printf("accept failed %s\n", strerror(errno));return EXIT_FAILURE;}/* 第一个版本memset(s, 0, sizeof(1024));if (recv(client_st, s, sizeof(s), 0) == -1){printf("recv failed %s\n", strerror(errno));close(client_st);return EXIT_FAILURE;}printf("revc is %s\n", s);close(client_st);*/// 第二个版/*while (1){memset(s, 0, sizeof(1024));if (recv(client_st, s, sizeof(s), 0) > 0){printf("revc is %s\n", s);} else{printf("recv failed %s\n", strerror(errno));break;}}close(client_st);*/// 第三个版本while (1){memset(s, 0, sizeof(1024));int rc = recv(client_st, s, sizeof(s), 0);// 是阻塞调用if (rc > 0){printf("revc is %s\n", s);} else{if (rc == 0){printf("client socket closed\n");}else{printf("recv failed %s\n", strerror(errno));}break;}}close(client_st);}close(st);return 0;}

makefile文件内容

.SUFFIXES:.c .oCC=gccSRCS1=sock.cSRCS2=server.cOBJS1=$(SRCS1:.c=.o)OBJS2=$(SRCS2:.c=.o)EXEC1=clientEXEC2=serverall: $(OBJS1) $(OBJS2) $(CC) -o $(EXEC1) $(OBJS1) $(CC) -o $(EXEC2) $(OBJS2) @echo '----------------ok------------'.c.o:$(CC) -Wall -g -o $@ -c $<clean:rm -f $(OBJS1)rm -f core*

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