udp socket 通信案例.doc

#include #include #include #include #include #include #include #include #define NOR 3#define QUIT 2#define LOG 1typedef struct node struct sockaddr_in addrc; struct node *next;linknode,*linklist;typedef struct int type; char name20; char buf1024;message;linklist CREAT();int main(int argc, char *argv) message msg; int sockfd; socklen_t slen; struct sockaddr_in addrs,addrc; linklist h,p,q; h=CREAT(); if (sockfd = socket (PF_INET,SOCK_DGRAM,0)0) perror(socket); exit(-1); memset(&addrs,0,sizeof(addrs); addrs.sin_family = PF_INET; addrs.sin_addr.s_addr = inet_addr(43); addrs.sin_port = htons(8888); if (bind(sockfd,(struct sockaddr *)&addrs,sizeof(addrs) next; p=CREAT(); h-next=p; p-next=m; p-addrc = addrc; printf(connectiong from %s %dn,inet_ntoa(p-addrc.sin_addr),ntohs(p-addrc.sin_port); q=h-next; while (q!=NULL) strcpy(msg.buf,); strcat(msg.buf, is coming); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&q-addrc,sizeof(q-addrc); q=q-next; if (msg.type = NOR) q=h-next; while(q!=NULL) sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&q-addrc,sizeof(q-addrc); q=q-next; if(msg.type = QUIT) strcpy(msg.buf,see you later); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrc,sizeof(addrc); delete(addrc,h); strcpy(msg.buf,); strcat(msg.buf,is outline); q=h-next; while(q!=NULL) sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&q-addrc,sizeof(q-addrc); q=q-next; return 0;linklist CREAT() linklist p; p=(linklist)malloc(sizeof(linknode); p-next=NULL; return p;int delete(struct sockaddr_in addrc,linklist ls) linklist m,n,p; m=ls-next; p=ls; if (memcmp(&m-addrc,&addrc,sizeof(addrc)=0) n=m-next; p-next=n; free(m); m=m-next; p=p-next;#include #include #include #include #include #include #include #include #include #define LOG 1#define NOR 3#define QUIT 2typedef struct int type; char name20; char buf1024;message;int main(int argc,char *argv) message msg,def; pid_t pid; pid_t ppid; int sockfd; struct sockaddr_in addrs; if (sockfd = socket (PF_INET,SOCK_DGRAM,0)0) perror(socket); exit(-1); memset(&addrs,0,sizeof(addrs); addrs.sin_family = PF_INET; addrs.sin_addr.s_addr = inet_addr(argv1); addrs.sin_port = htons(atoi(argv2); /* if(connect(sockfd,(struct sockaddr *)&addrs,sizeof(addrs)0) perror(connect); exit(-1); */send login message msg.type=LOG; strcpy(,TOM); strcpy(msg.buf,Im here); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrs,sizeof(addrs); memset(&msg,0,sizeof(msg); recvfrom(sockfd,&msg,sizeof(msg),0,NULL,NULL); printf(from server %sn,msg.buf); /creat fork if(pid = fork()0) perror(fork); exit(-1); /child fork if(pid=0) ppid=getppid(); printf(begin to chat); while(strncmp(msg.buf,quit,4)!=0) msg.type = NOR; fgets(msg.buf,sizeof(msg.buf),stdin); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrs,sizeof(addrs); msg.type = QUIT; sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrs,sizeof(addrs); sleep(1); kill(ppid,SIGKILL); exit(0); else/father fork while(1) memset(&def,0,sizeof(def); recvfrom(sockfd,&def,100,0,NULL,NULL); printf( %s: %sn,,def.buf); #include #include #include #include #include #include #include #include #include #define LOG 1#define NOR 3#define QUIT 2typedef struct int type; char name20; char buf1024;message;int main(int argc,char *argv) message msg,def; pid_t pid; pid_t ppid; int sockfd; struct sockaddr_in addrs; if (sockfd = socket (PF_INET,SOCK_DGRAM,0)0) perror(socket); exit(-1); memset(&addrs,0,sizeof(addrs); addrs.sin_family = PF_INET; addrs.sin_addr.s_addr = inet_addr(argv1); addrs.sin_port = htons(atoi(argv2); if(connect(sockfd,(struct sockaddr *)&addrs,sizeof(addrs)0) perror(connect); exit(-1); /send login message msg.type=LOG; strcpy(,MMK); strcpy(msg.buf,Im here); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrs,sizeof(addrs); memset(&msg,0,sizeof(msg); recvfrom(sockfd,&msg,sizeof(msg),0,NULL,NULL); printf(from server %sn,msg.buf); /creat fork if(pid = fork()0) perror(fork); exit(-1); /child fork if(pid=0) ppid=getppid(); printf(begin to chat); while(strncmp(msg.buf,quit,4)!=0) msg.type = NOR; fgets(msg.buf,sizeof(msg.buf),stdin); sendto(sockfd,&msg,sizeof(msg),0,(struct sockaddr *)&addrs,sizeof(addrs); msg.type = QUIT; sendto(sockfd,&msg