udp socket 通信案例(2)

exit(-1); }

//child fork if(pid==0) {

ppid=getppid();

printf(\

while(strncmp(msg.buf,\ { 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(\ } } }

#include #include #include #include #include #include #include #include #include #define LOG 1

#define NOR 3 #define QUIT 2

typedef struct {

int type;

char name[20]; char buf[1024];

}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(\ exit(-1); }

memset(&addrs,0,sizeof(addrs)); addrs.sin_family = PF_INET;

addrs.sin_addr.s_addr = inet_addr(argv[1]); addrs.sin_port = htons(atoi(argv[2]));

if(connect(sockfd,(struct sockaddr *)&addrs,sizeof(addrs))<0) {

perror(\ exit(-1); }

//send login message msg.type=LOG;

strcpy(msg.name,\ strcpy(msg.buf,\

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(\

//creat fork

if((pid = fork())<0) {

perror(\ exit(-1); }

//child fork if(pid==0) {

ppid=getppid();

printf(\

while(strncmp(msg.buf,\ { 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(\ } } }