运用dup2的tcp socket通信

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dup 和 dup2既然有重定向的功能，那么我们之前写的tcp socket通信是不是可以修改一下呢？比如，不用write往socket里面写，而直接用dup2/dup重定向呢？

答案是肯定的。

代码如下

tcp_dup2_server

#include #include #include #include #include #include #include #include #include int startup(const char* _ip, int _port){int sock = socket(AF_INET, SOCK_STREAM, 0);if(sock < 0){perror("socket");exit(2);}// bind绑定struct sockaddr_in local;local.sin_family = AF_INET;local.sin_port = htons(_port);local.sin_addr.s_addr = inet_addr(_ip);if(bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0){perror("bind---");exit(3);}if(listen(sock, 10) < 0){perror("listen");exit(4);}return sock;}static void usage(const char *proc){printf("%s[ip][port]\n", proc);}int main(int argc, char *argv[]){if(argc != 3){usage(argv[0]);return 1;}//int sock =startup(argv[1], atoi(argv[2]));int listen_sock =startup(argv[1], atoi(argv[2]));struct sockaddr_in remote;socklen_t len = sizeof(remote);char buf[1024];sleep(2);while(1){int sock = accept(listen_sock, (struct sockaddr*)&remote, &len);if(sock < 0){perror("accept***************");continue;}printf("client ip: %s, port: %d\n", inet_ntoa(remote.sin_addr), ntohs(remote.sin_port));while(1){ssize_t s = read(sock, buf, sizeof(buf)-1);if(s > 0){buf[s] = 0;printf("client say# %s\n", buf);write(sock, buf, strlen(buf));}else if(s == 0){printf("client is lose");break;}}}}

tcp_dup2_client

#include #include #include #include #include #include #include #include #include static void usage(const char *proc){printf("%s[ip][port]\n", proc);}int main(int argc, char *argv[]){if(argc != 3){usage(argv[0]);return 1;}int sock = socket(AF_INET, SOCK_STREAM, 0);if(sock < 0){perror("socket");return 1;}struct sockaddr_in peer;peer.sin_family = AF_INET;peer.sin_port = htons(atoi(argv[2]));peer.sin_addr.s_addr = inet_addr(argv[1]);if(connect(sock, (struct sockaddr*)& peer, sizeof(peer)) < 0){perror("connet");return 3;}char buf[1024];int ret = dup2(sock, 1);while(1){//printf("please user enter:");//fflush(stdout);ssize_t _s = read(0, buf, sizeof(buf)-1);if(_s > 0){buf[_s-1] = 0;//write(sock, buf, sizeof(buf)-1);}printf("%s", buf);fflush(stdout);}close(sock);}

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