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#include <sys/types.h>
#include <sys/socket.h>
int getsockopt(int sock, int level, int optname, void *optval, socklen_t *optlen);
int setsockopt(int sock, int level, int optname, const void *optval, socklen_t optlen);
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levelÖ¸¶¨¿ØÖÆÌ×½Ó×ֵIJã´Î.¿ÉÒÔÈ¡ÈýÖÖÖµ:
1)SOL_SOCKET:ͨÓÃÌ×½Ó×ÖÑ¡Ïî.
2)IPPROTO_IP:IPÑ¡Ïî.
3)IPPROTO_TCP:TCPÑ¡Ïî.¡¡
optnameÖ¸¶¨¿ØÖƵķ½Ê½(Ñ¡ÏîµÄÃû³Æ),ÎÒÃÇÏÂÃæÏêϸ½âÊÍ¡¡
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========================================================================
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------------------------------------------------------------------------
SO_BROADCAST¡¡¡¡¡¡¡¡¡¡¡¡ÔÊÐí·¢Ë͹㲥Êý¾Ý¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡int
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