我正在用C編寫一個簡單的客戶端和服務器程序。我能夠從客戶端發送日期到服務器。但是,我無法從服務器向客戶端發送確認。udp客戶端服務器程序c
/*******************udpserver.c*****************/
int main(int argc, char *argv[])
{
/* Variable and structure definitions. */
int sd, rc;
struct sockaddr_in serveraddr, clientaddr;
clientaddrlen = sizeof(clientaddr);
int serveraddrlen = sizeof(serveraddr);
char buffer[100];
char *bufptr = buffer;
int buflen = sizeof(buffer);
if((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("UDP server - socket() error");
exit(-1);
}
printf("UDP server - socket() is OK\n");
memset(&serveraddr, 0x00, serveraddrlen);
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(0);
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
if((rc = bind(sd, (struct sockaddr *)&serveraddr, serveraddrlen)) < 0) {
perror("UDP server - bind() error");
close(sd);
exit(-1);
}
int addr_len = sizeof(serveraddr);
if (getsockname(sd, (struct sockaddr *) &serveraddr, &addr_len)<0) {
perror("Error getting socket name.\n");
return -1;
}
printf("Using IP %s and port %d\n", inet_ntoa(serveraddr.sin_addr), ntohs(serveraddr.sin_port));
printf("UDP server - Listening...\n");
rc = recvfrom(sd, bufptr, buflen, 0, (struct sockaddr *)&clientaddr, &clientaddrlen);
if(rc < 0) {
perror("UDP Server - recvfrom() error");
close(sd);
exit(-1);
}
printf("UDP Server received the following:\n \"%s\" message\n", bufptr);
printf("UDP Server replying to the UDP client...\n");
rc = sendto(sd, bufptr, buflen, 0, (struct sockaddr *)&clientaddr, clientaddrlen);
if(rc < 0) {
perror("UDP server - sendto() error");
close(sd);
exit(-1);
}
printf("UDP Server - sendto() is OK...\n");
close(sd);
exit(0);
}
我UDPClient程序:
/****************udpclient.c********************/
int main(int argc, char *argv[])
{
/* Variable and structure definitions. */
int sd, rc;
struct sockaddr_in serveraddr, clientaddr;
int serveraddrlen = sizeof(serveraddr);
char server[255];
char buffer[100];
char *bufptr = buffer;
int buflen = sizeof(buffer);
struct hostent *hostp;
memset(buffer, 0x00, sizeof(buffer));
/* 36 characters + terminating NULL */
memcpy(buffer, "Hello! A client request message lol!", 37);
if((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("UDP Client - socket() error");
exit(-1);
}
else
printf("UDP Client - socket() is OK!\n");
if(argc != 3) {
/*Use default hostname or IP*/
printf("UDP Client - Usage <Server hostname or IP>\n");
exit(0);
}
memset(&serveraddr, 0x00, sizeof(struct sockaddr_in));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(atoi(argv[2]));
hostp = gethostbyname(argv[1]);
if(hostp == (struct hostent *)NULL) {
printf("HOST NOT FOUND --> ");
printf("h_errno = %d\n", h_errno);
exit(-1);
}
else {
printf("UDP Client - gethostname() of the server is OK... \n");
printf("Connected to UDP server\n");
}
memcpy(&serveraddr.sin_addr, hostp->h_addr, sizeof(serveraddr.sin_addr));
rc = sendto(sd, bufptr, buflen, 0, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
if(rc < 0) {
perror("UDP Client - sendto() error");
close(sd);
exit(-1);
}
else
printf("UDP Client - sendto() is OK!\n");
printf("Waiting a reply from UDP server...\n");
rc = recvfrom(sd, bufptr, buflen, 0, (struct sockaddr *)&serveraddr, &serveraddrlen);
if(rc < 0) {
perror("UDP Client - recvfrom() error");
close(sd);
exit(-1);
} else {
printf("UDP client received the following: \"%s\" message\n", bufptr);
}
close(sd);
exit(0);
}
當運行兩個程序,我得到了以下的輸出:
UdpServer:
$ ./UdpServer
UDP server - socket() is OK
Using IP 0.0.0.0 and port 49932
UDP server - Listening...
UDP Server received the following:
"Hello! A client request message lol!" message
UDP Server replying to the UDP client...
UDP Server - sendto() is OK...
UdpClient:
$ ./UdpClient MyPC 49932
UDP Client - socket() is OK!
UDP Client - gethostname() of the server is OK...
Connected to UDP server
UDP Client - sendto() is OK!
Waiting a reply from UDP server...
UdpClient程序停留在這一點。任何人都可以請解釋什麼是問題?
據我嘗試添加睡眠()中正在發送,接收和確認之間。所以它不會被重疊,或者你可以說它會被正確地同步。 – SRJ
當我在服務器中添加睡眠時,它運行良好。還有其他方法嗎? –
sleep()提供同步。如果你想要另一種方式,然後嘗試實現鎖定機制(信號等),這將確保不會發生死鎖。 – SRJ