udp_server.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#define BUF_SIZE 1024
int main(int argc, char *argv[])
{
struct addrinfo hint, *result;
struct sockaddr_in client_addr;
int res, sfd, client_addr_len;
char buf[BUF_SIZE];
struct sockaddr_in addr;
memset(&addr, 0, sizeof(struct sockaddr_in));
unsigned short port = 30026;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
sfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sfd == -1)
{
perror("socket error!\n");
exit(1);
}
res = bind(sfd, (struct sockaddr *)&addr, sizeof(struct sockaddr_in));
if (res == -1)
{
perror("bind error!\n");
exit(1);
}
while (1)
{
printf("waiting for client ...\n");
res = recv(sfd, buf, BUF_SIZE, 0);
if (res == -1)
{
perror("recvfrom error\n");
exit(1);
}
printf("revceived data : %s\n", buf);
snprintf(buf, BUF_SIZE, "hello client! Total reveive : %d.", res);
// // res = sendto(sfd, buf, strlen(buf), 0, (struct sockaddr*)&client_addr, client_addr_len);
// res = send(sfd, buf, strlen(buf), 0);
// if (res != strlen(buf) )
// {
// perror("sendto error\n");
// exit(1);
// }
// printf("send %d bytes to peer", res);
// printf("send data < %s > to client\n\n", buf);
}
}