linux socket通信DEMO

#include <sys/types.h> #include <sys/socket.h> #include <sys/time.h> #include <netinet/in.h> #include <unistd.h> #include <stdio.h> #include <string.h> #include <time.h> #include<sys/wait.h> #include<errno.h> //#include<arpa.inet.h> #define BUFFSIZE 128 #define PORT 10355 int main() { struct sockaddr_in addr; int sockfileDesc, n,addr_len,m; char buff[BUFFSIZE]="\0"; sockfileDesc = socket(AF_INET, SOCK_DGRAM, 0); if(sockfileDesc<0) { printf("create socket error\n"); } // err_sys("socket error"); bzero((char *) &addr, sizeof(addr)); addr_len=sizeof(struct sockaddr_in); // memset(&addr,0,addr_len); addr.sin_family = AF_INET; addr.sin_addr.s_addr = INADDR_ANY; addr.sin_port=htons(PORT); if(bind(sockfileDesc,(struct sockaddr*)&addr,sizeof(addr))<0) { perror("connect error"); return -1; } /* n=sendto(sockfileDesc, buff, BUFFSIZE, 0, (struct sockaddr *)&addr,sizeof(addr)); printf("%d",n); memset(&localaddr,0,addr_len); localaddr.sin_family = AF_INET; localaddr.sin_addr.s_addr = inet_addr("192.192.192.211"); localaddr.sin_port=htons(10355);*/ // err_sys("sendto error"); while(1) { m=recvfrom(sockfileDesc, buff, sizeof(buff), 0, (struct sockaddr*)&addr, &addr_len); if(m<0) { printf("recvfrom error\n"); } // buff[n-2]=0; printf("receive from client %s\n", inet_ntoa(addr.sin_addr)); printf("receive data is %s\n", buff); sendto(sockfileDesc,buff,m,0,(struct sockaddr*)&addr,addr_len); /* if(memcmp(&recvaddr,&addr,addr_len)!=0) { buff[BUFFSIZE]=0; printf("%s\n", buff); }*/ usleep(10000); } return 0; }