joker0910的专栏

#include int setsockopt( int socket, int level, int option_name, const void *option_value, size_t option_len);

struct hostent *gethostbyname(const char *name); gethostbyname函数根据域名解析出服务器的ip地址，它返回一个结构体struct hostent： #include struct hostent { char *h_name; /* official name of host */

from:  http://blog.youkuaiyun.com/yanook/article/details/7202553 1. 设置TCP_DEFER_ACCEPT int val = 10; // time_out if (setsockopt(sock_descriptor, IPPROTO_TCP, TCP_DEFER_ACCEPT, &val, sizeof(val))==