client.c和server.c 网络套接字socket编程热身程序

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/*server.c*/#include <stdio.h>#include <arpa/inet.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <netinet/in.h>#include <stdlib.h>#include <unistd.h>#define  err_log(errlog) do{ perror(errlog); exit(1);}while(0)int main(int argc, const char *argv[]){int sockfd;int acceptfd;struct sockaddr_in  serveraddr, clientaddr;if(argc != 3){fprintf(stderr,"Usage:%s serverip port.\n", argv[0]);return -1;}if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){err_log("fail to socket");}serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr(argv[1]);serveraddr.sin_port = htons(atoi(argv[2]));if(bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0){err_log("fail to bind");}if(listen(sockfd, 15) < 0){err_log("fail to listen");}socklen_t  addrlen = sizeof(struct sockaddr_in);acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &addrlen);if(acceptfd < 0){err_log("fail to acceptfd");}printf("%s --> %d\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));    close(acceptfd);close(sockfd);return 0;}

/*client*/#include <stdio.h>#include <arpa/inet.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <netinet/in.h>#include <stdlib.h>#include <unistd.h>#define  err_log(errlog) do{ perror(errlog); exit(1);}while(0)int main(int argc, const char *argv[]){int sockfd;int acceptfd;struct sockaddr_in  serveraddr, clientaddr;if(argc != 3){fprintf(stderr,"Usage:%s serverip port.\n", argv[0]);return -1;}if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){err_log("fail to socket");}serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr(argv[1]);serveraddr.sin_port = htons(atoi(argv[2]));if(connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0){err_log("fail to connect");}close(sockfd);return 0;}

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