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 ÍøÂç³ÌÐòºÍÆÕͨ³ÌÐò×î´óµÄÇø±ð¾ÍÊÇ,ÍøÂç³ÌÐòÊÇÓÉÁ½²¿·Ö×é³ÉµÄ--server/client.Ò»°ãÇé¿öÏÂ,ÊÇÏÈÔËÐÐserver¶ËÉϵijÌÐò,È»ºóµÈ´ýclient¶ËÉϵijÌÐòÔËÐв¢½¨Á¢Á¬½Ó,server¶ËÉϵijÌÐòÔÚÒ»¸ö¶Ë¿Ú¼àÌý,µÈ´ýclient¶Ë·¢À´µÄÇëÇó.
int socket(int domain,int type,int protocol)
domain:˵Ã÷ͨѶ³ÌÐòËùÔÚÖ÷»úËù²ÉÓõÄͨѶЭÒéÀà(AF_INETºÍAF_UNIXµÈ);AF_UNIXÖ»ÄÜÓÃÓÚµ¥Ò»µÄUNIXϵͳ½ø³Ì¼äͨѶ,AF_INETÊÇÕë¶ÔinternetµÄ,¿ÉÒÔÓÃÓÚÔ¶³ÌÖ÷»ú¼äµÄͨѶ;
type:ÍøÂç³ÌÐòËù²ÉÈ¡µÄͨѶЭÒé(SOCK_STREAMºÍSOCK_DGRAM);
protocl:Ëù²ÉÈ¡µÄЭÒé,Ò»°ãÉèÖÃΪ0¾Í¿ÉÒÔÁË,Ö÷»ú»á×Ô¶¯Ñ¡ÔñºÏÊʵÄЭÒé.
int bind(int sockfd,struct sockaddr * myaddr,int addrlen)
sockfd:ÊÇsocketµÄ·µ»ØµÄÎļþÃèÊö·û,ÓÃÓÚ¼àÌýµÄsocket;
addrlen:ÊÇsockaddr½á¹¹µÄ³¤¶È;
myaddr:ÊÇÒ»¸öÖ¸ÏòsockaddrµÄ½á¹¹ÌåµÄÖ¸Õë;
¶ÔÓÚsockaddr½á¹¹ÌåµÄ¶¨Òå:
struct sockaddr
{
    unsigned short as_family;
    char as_data[14];
}
ÓÉÓÚϵͳµÄ¼æÈÝÐÔ,ÓÃÁíÍâÒ»¸ö½á¹¹ÌåÌæ´ú,sockaddr_in:
struct sockaddr_in
{
   unsigned short sin_family;
   unsigned short sin_port;
   struct in_addr sin_addr;
   unsigned char sin_zero[8];
}
sin_addrÒ»°ãÊÇÉèÖÃΪINADDR_ANY,¿ÉÒÔ½ÓÊÜÈκÎÖ÷»úµÄͨѶ,sin_portÊÇÒª¼àÌýµÄ¶Ë¿Ú,bind()½«±¾µØ¶Ë¿ÚºÍsocket°ó¶¨ÔÚÒ»Æð,³É¹¦ºó·µ»Ø0,ʧ°Üʱ·µ»Ø-1,ºÍsocket()Ò»Ñù.
int listen(int sockfd,int queuelen)
sockfd:bind()µÄsocketÃèÊö·û,ÓÃÓÚ¼àÌýµÄsocketÃèÊö·û;
queuelen:µÈºòÅŶӵÄ×î´ó³¤¶È.listen()½«bind()µÄsocketÃèÊö·û±äΪ¼àÌýµÄÌ×½Ó×Ö,·µ»ØµÄÇé¿öºÍbind()Ò»Ñù.
int accept(int sockfd,struct sockaddr * addr,int addrlen)
sockfd:ÊÇlistenºóµÄÎļþÃèÊö·û;
addrºÍaddrlen:ÊǸøclient¶Ë³ÌÐòÌîдµÄ,·þÎñÆ÷Ö»Òª´«µÝÖ¸Õë¾Í¿ÉÒÔÁË;
bind(),listen()ºÍaccept()ÊÇ·þÎñ¶ËÓõĺ¯Êý,accept()º¯Êýµ÷ÓÃʱ,server¶Ë»áÒ»Ö±×èÈûµ½ÓÐÒ»¸öclient·¢³öÁËÁ¬½ÓÇëÇó,accept()³É¹¦Ê±·µ»Ø×îºóµÄ·þÎñÆ÷¶ËµÄÎļþÃèÊö·û,ÏÖÔÚ·þÎñÆ÷¶Ë¿ÉÒÔÏò¸ÃÃèÊö·ûдÐÅÏ¢ÁË.ʧ°Üʱ·µ»Ø-1.
int connect(int sockfd,struct sockaddr *servaddr,int addrlen)
sockfd:socket()·µ»ØµÄÎļþÃèÊö·û;
servaddr:´æ´¢ÁËserver¶ËµÄÁ¬½ÓÐÅÏ¢,ÀïÃæµÄsin_familyÊÇ·þÎñÆ÷¶ËµÄµØÖ·
addrlen:servaddrµÄ³¤¶È;
connect()ÊÇ


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