udp client and server linux下

zhr811022 发表于 2011-12-20 09:47

udp server
///////////////////////////////////////////////////////
#include <arpa/inet.h> #include <netinet/in.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <unistd.h>
#define BUFLEN 512 #define NPACK 10 #define PORT 9876
//#define SRV_IP "116.236.218.246" #define SRV_IP "172.26.59.244"
void diep(char *s) {   perror(s);   exit(1); }
int main(void) {   struct sockaddr_in si_me, si_other;   int s, i, slen=sizeof(si_other);   char buf;
  if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)     diep("socket");
  memset((char *) &si_me, 0, sizeof(si_me));   si_me.sin_family = AF_INET;   si_me.sin_port = htons(PORT);   si_me.sin_addr.s_addr = htonl(INADDR_ANY);//inet_addr(SRV_IP);   if (bind(s, &si_me, sizeof(si_me))==-1)       diep("bind");
  for (i=0; i<NPACK; i++) {     if (recvfrom(s, buf, BUFLEN, 0, &si_other, &slen)==-1)       diep("recvfrom()");     printf("Received packet from %s:%d\nData: %s\n\n",            inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port), buf);         sleep(9);         sprintf(buf, "MSG FROM Server");     printf("To reply data to %s:%d\nData: %s\n\n",            inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port), buf);     if (sendto(s, buf, strlen(buf), 0, &si_other, slen)==-1)       diep("sendto()");   }
  close(s);   return 0; }
///////////////////////////////////////////////////////////////////////////////
udp client

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udp client and server linux下