#include #include #include #include #include #include #include #include #include #define MSG_STR "Hello LingYun IoT Studio\n" void print_usage(char *progname) { printf("%s usage: \n", progname); printf("-i(--ipaddr): sepcify server IP address\n"); printf("-p(--port): sepcify server port.\n"); printf("-h(--Help): print this help information.\n"); return ; } int main(int argc, char **argv) { int sockfd = -1; int rv = -1; struct sockaddr_in servaddr; char *servip = NULL; int port = 0; char buf[1024]; int ch; struct option opts[] = { {"ipaddr", required_argument, NULL, 'i'}, {"port", required_argument, NULL, 'p'}, {"help", no_argument, NULL, 'h'}, {NULL, 0, NULL, 0} }; while( (ch=getopt_long(argc, argv, "i:p:h", opts, NULL)) != -1 ) { switch(ch) { case 'i': servip=optarg; break; case 'p': port=atoi(optarg); break; case 'h': print_usage(argv[0]); return 0; } } if( !servip || !port ) { print_usage(argv[0]); return 0; } sockfd=socket(AF_INET, SOCK_STREAM, 0); if(sockfd < 0) { printf("Create socket failure: %s\n", strerror(errno)); return -1; } printf("Create socket[%d] successfully!\n", sockfd); memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family=AF_INET; servaddr.sin_port = htons(port); inet_aton(servip, &servaddr.sin_addr); rv=connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); if(rv < 0) { printf("Connect to server[%s:%d] failure: %s\n", servip, port, strerror(errno)); return -2; } printf("Connect to server[%s:%d] successfully!\n", servip, port); while(1) { rv=write(sockfd, MSG_STR, strlen(MSG_STR)); if(rv < 0) { printf("Write to server by sockfd[%d] failure: %s\n", sockfd, strerror(errno)); break; } memset(buf, 0, sizeof(buf)); rv=read(sockfd, buf, sizeof(buf)); if( rv < 0) { printf("Read data from server by sockfd[%d] failure: %s\n", sockfd, strerror(errno)); break; } else if( rv == 0) { printf("Socket[%d] get disconnected\n", sockfd); break; } else if( rv > 0 ) { printf("Read %d bytes data from Server: %s\n", rv, buf); } } close(sockfd); }