?? p13.8.c
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#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#include <stdio.h>#include <unistd.h>int main(int argc, char *argv[]){ int sock, length, fromlen, n; struct sockaddr_in server; struct sockaddr_in from; char buf[1024]; if (argc!= 2) { printf( "Usage: %s port_num\n",argv[0]); return 1; } sock=socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0){ perror("cannot create communicating socket"); return 1; } length = sizeof(server); bzero(&server,length); server.sin_family=AF_INET; server.sin_addr.s_addr=INADDR_ANY; server.sin_port=htons(atoi(argv[1])); if (bind(sock,(struct sockaddr *)&server,length)<0){ perror("cannot bind the socket"); close(sock); return 1; } fromlen = sizeof(struct sockaddr_in); while (1) { n = recvfrom(sock,buf,sizeof(buf),0,(struct sockaddr *)&from,&fromlen); if (n < 0) { perror("cannot receive date from client"); break; } write(STDOUT_FILENO,"server: Received a datagram: ",29); write(STDOUT_FILENO,buf,n); n = sendto(sock,"send message to client\n",22, 0,(struct sockaddr *)&from,fromlen); if (n < 0) { perror("cannot send data to the client"); break; } } close(sock); return 0; }?? 快捷鍵說明
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