udp
服务器:udpsrv.c
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netinet/ip.h>
#include<strings.h>
#include<string.h>
#include<arpa/inet.h>
int main(int argc, char **argv)
{
int sockfd;
socklen_t addrlen;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in my_addr, cli_addr;
bzero(&my_addr, sizeof my_addr);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(atoi(argv[1]));
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(sockfd, (struct sockaddr *)&my_addr, sizeof(my_addr));
char buf[80];
while(1){
bzero(buf, 80);
addrlen = sizeof(cli_addr);
recvfrom(sockfd, buf, 79, 0,
(struct sockaddr *)&cli_addr, &addrlen);
fputs(buf, stdout);
sendto(sockfd, buf, strlen(buf), 0,
(struct sockaddr *)&cli_addr, addrlen);
}
close(sockfd);
return 0;
}
客服端:udpcli.c
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netinet/ip.h>
#include<strings.h>
#include<string.h>
#include<arpa/inet.h>
int main(int argc, char **argv)
{
int sockfd;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in my_addr;
bzero(&my_addr, sizeof my_addr);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(atoi(argv[2]));
my_addr.sin_addr.s_addr = inet_addr(argv[1]);
char buf[80];
socklen_t addrlen;
addrlen = sizeof(my_addr);
while(1){
bzero(buf, 80);
printf("pls input: ");
fgets(buf, 80, stdin);
sendto(sockfd, buf, strlen(buf), 0,
(struct sockaddr *)&my_addr, sizeof(my_addr));
bzero(buf,80);
recvfrom(sockfd, buf, 79, 0,
(struct sockaddr *)&my_addr, &addrlen);
printf("buf: %s\n", buf);
}
close(sockfd);
return 0;
}