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        3. FDºê
        4. ¶Áдº¯Êý
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        6. Õû¸ö´úÂë
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s = socket(AF_INET, SOCK_STREAM, 0);
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = inet_addr(hstname);
if(sin.sin_addr.s_addr == INADDR_NONE) {
connect(s, (struct sockaddr *)&sin, sizeof(sin))

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int x;
x=fcntl(s,F_GETFL,0);
fcntl(s,F_SETFL,x | O_NONBLOCK);

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