/*first?step?in?udp?programming*/
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#define?BUFLEN?255
int?main（int?argcchar?**argv）
{	
	struct?sockaddr_in?peeraddrlocaladdr;
	int?sockfd;
	char?recmsg[BUFLEN+1]pushmsg[BUFLEN+1];
	int?socklenn;
	if（argc!=5）{
		printf（“%s????\n“argv[0]）;
		exit（0）;
	}

	sockfd=socket（AF_INETSOCK_DGRAM0）;
	if（sockfd<0）{
		fprintf（stderr“socket?creating?error?in?udptalk.c!\n“）;
		exit（1）;
	}
	socklen=sizeof（struct?sockaddr）;
	memset（&peeraddr0socklen）;
	peeraddr.sin_family=AF_INET;
	peeraddr.sin_port=htons（atoi（argv[2]））;
	if（inet_pton（AF_INETargv[1]&peeraddr.sin_addr）<=0）{
		printf（“Wrong?dest?IP?address!\n“）;
????	?	exit（0）;	}

	memset（&localaddr0socklen）;
	localaddr.sin_family=AF_INET;
	localaddr.sin_port=htons（atoi（argv[4]））;
	if（inet_pton（AF_INETargv[3]&localaddr.sin_addr）<=0）{
		printf（“Wrong?source?IP?address!\n“）;
		exit（0）;
	}

	if（bind（sockfd（struct?sockaddr?*）（&localaddr）socklen）<0）{
		fprintf（stderr“bind?local?address?error?in?udptalk.c!\n“）;
		exit（2）;
	}
	
	fcntl（0F_SETFL?O_NONBLOCK）;
	printf（“:	“）;
	for（;;）{
		pushmsg[0]=0;
		if（fgets（pushmsgBUFLENstdin）==“EOF“）exit（0）;

		if（pushmsg[0]!=0）if（sendto（sockfdpushmsgstrlen（pushmsg）0（struct?sockaddr?*）（&peeraddr）socklen）<0）{
			fprintf（stderr“sendto?error?in?udptalk.c!\n“）;
			perror（““）;
			exit（3）;
		}else?printf（“:	“）;

????????????????n=recvfrom（sockfdrecmsgBUFLENMSG_DONTWAIT（struct?sockaddr?*）（&peeraddr）（socklen_t*）&socklen）;
????????????????if（n<0）{
????????????????????????//fprintf（stderr“recvfrom?error?in?udptalk.c\n“）;
????????????????????????//perror（““）;
????????????????????????//exit（4）;
????????????????}
????????????????else{
????????????????????????recmsg[n]=0;
????????????????????????printf（“\n%s#%d>>>:????????%s:	“inet_ntoa（peeraddr.sin_addr）ntohs（peeraddr.sin_port）recmsg）;
		}
?	}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????220??2013-06-09?13:01??#V1.00R130608-130609Linux?UDP?Talk（talk）\README.txt

?????文件????????220??2013-06-09?13:01??#V1.00R130608-130609Linux?UDP?Talk（talk）\README.txt~

?????文件??????10244??2013-06-09?12:45??#V1.00R130608-130609Linux?UDP?Talk（talk）\talk

?????文件???????2086??2013-06-09?12:45??#V1.00R130608-130609Linux?UDP?Talk（talk）\talk.cpp

?????目錄??????????0??2013-06-09?13:01??#V1.00R130608-130609Linux?UDP?Talk（talk）

-----------?---------??----------?-----??----

????????????????12770????????????????????5