The Server.c
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<netinet/in.h>
#include<sys/socket.h>
#include<string.h>
#include<unistd.h>
#include<signal.h>
#include<sys/ipc.h>
#include<errno.h>
#include<sys/shm.h>
#include<time.h>
#define PERM S_IRUSR|S_IWUSR
#define MYPORT 3490
#define BACKLOG 10
#define WELCOME "|----------Welcome to the chat room! ----------|"
//int sockfd;
/**//*void quit(int signo)
{
close(sockfd);
printf("welcome come to the room again!\n");
exit(0);
}*/
//type int to char*
void itoa(int i,char*string)
{
int power,j;
j=i;
for(power=1;j>=10;j/=10)
power*=10;
for(;power>0;power/=10)
{
*string++='0'+i/power;
i%=power;
}
*string='\0';
}
//get current system time
void get_cur_time(char * time_str)
{
time_t timep;
struct tm *p_curtime;
char *time_tmp;
time_tmp=(char *)malloc(2);
memset(time_tmp,0,2);
memset(time_str,0,20);
time(&timep);
p_curtime = localtime(&timep);
strcat(time_str," (");
itoa(p_curtime->tm_hour,time_tmp);
strcat(time_str,time_tmp);
strcat(time_str,":");
itoa(p_curtime->tm_min,time_tmp);
strcat(time_str,time_tmp);
strcat(time_str,":");
itoa(p_curtime->tm_sec,time_tmp);
strcat(time_str,time_tmp);
strcat(time_str,")");
free(time_tmp);
}
//Create Share Memory
key_t shm_create()
{
key_t shmid;
//shmid = shmget(IPC_PRIVATE,1024,PERM);
if((shmid = shmget(IPC_PRIVATE,1024,PERM)) == -1)
{
fprintf(stderr,"Create Share Memory Error:%s\n\a",strerror(errno));
exit(1);
}
return shmid;
}
int bindPort(unsigned short int port)
{
int sockfd;
struct sockaddr_in my_addr;
sockfd = socket(AF_INET,SOCK_STREAM,0);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(port);
my_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(my_addr.sin_zero),0);
if(bind(sockfd,(struct sockaddr*)&my_addr,sizeof(struct sockaddr)) == -1)
{
perror("bind");
exit(1);
}
printf("bing success!\n");
return sockfd;
}
int main(int argc, char *argv[])
{
int sockfd,clientfd,sin_size,recvbytes;
pid_t pid,ppid;
char *buf, *r_addr, *w_addr, *temp, *time_str;//="\0";
struct sockaddr_in their_addr;
key_t shmid;
shmid = shm_create(); //Create Share Memory
temp = (char *)malloc(255);
time_str=(char *)malloc(20);
/**//*if(signal(SIGUSR1, quit) == SIG_ERR)
{
perror("Can\'t set SIGUSR1 signal action");
exit(1);
}*/
sockfd = bindPort(MYPORT);
while(1)
{
if(listen(sockfd,BACKLOG) == -1)
{
perror("listen");
exit(1);
}
printf("listening\n");
if((clientfd = accept(sockfd,(struct sockaddr*)&their_addr,&sin_size)) == -1)
{
perror("accept");
exit(1);
}
printf("accept from:%s\n",inet_ntoa(their_addr.sin_addr));
send(clientfd,WELCOME,strlen(WELCOME),0);
buf = (char *)malloc(255);
ppid = fork();
if(ppid == 0)
{
//printf("ppid=0\n");
pid = fork();
while(1)
{
if(pid > 0)
{
memset(buf,0,255);
//printf("recv\n");
//sleep(1);
if((recvbytes = recv(clientfd,buf,255,0)) <= 0)
{
perror("recv1");
close(clientfd);
raise(SIGKILL);
exit(1);
}
//write buf's data to share memory
w_addr = shmat(shmid, 0, 0);
memset(w_addr, '\0', 1024);
strncpy(w_addr, buf, 1024);
get_cur_time(time_str);
strcat(buf,time_str);
printf(" %s\n",buf);
}
else if(pid == 0)
{
//scanf("%s",buf);
sleep(1);
r_addr = shmat(shmid, 0, 0);
//printf("---%s\n",r_addr);
//printf("cmp:%d\n",strcmp(temp,r_addr));
if(strcmp(temp,r_addr) != 0)
{
strcpy(temp,r_addr);
get_cur_time(time_str);
strcat(r_addr,time_str);
//printf("discriptor:%d\n",clientfd);
//if(send(clientfd,buf,strlen(buf),0) == -1)
if(send(clientfd,r_addr,strlen(r_addr),0) == -1)
{
perror("send");
}
memset(r_addr, '\0', 1024);
strcpy(r_addr,temp);
//
}
/**//*get_cur_time(time_str);
printf("time:%s\n",time_str);
strcat(r_addr,time_str);*/
}
else
perror("fork");
}
}
}
printf("------------------------------\n");
free(buf);
close(sockfd);
close(clientfd);
return 0;
}The Client.c
#include<stdio.h>
#include<netinet/in.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<stdlib.h>
#include<netdb.h>
#include<unistd.h>
#include<signal.h>
#include<time.h>
int main(int argc, char *argv[])
{
struct sockaddr_in clientaddr;
pid_t pid;
int clientfd,sendbytes,recvbytes;
struct hostent *host;
char *buf,*buf_r;
if(argc < 4)
{
printf("usage:\n");
printf("%s host port name\n",argv[0]);
exit(1);
}
host = gethostbyname(argv[1]);
if((clientfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
perror("socket\n");
exit(1);
}
clientaddr.sin_family = AF_INET;
clientaddr.sin_port = htons((uint16_t)atoi(argv[2]));
clientaddr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(clientaddr.sin_zero),0);
if(connect(clientfd,(struct sockaddr *)&clientaddr,sizeof(struct sockaddr)) == -1)
{
perror("connect\n");
exit(1);
}
buf=(char *)malloc(120);
memset(buf,0,120);
buf_r=(char *)malloc(100);
if( recv(clientfd,buf,100,0) == -1)
{
perror("recv:");
exit(1);
}
printf("\n%s\n",buf);
pid = fork();
while(1)
{
if(pid > 0){
//get_cur_time(time_str);
strcpy(buf,argv[3]);
strcat(buf,":");
memset(buf_r,0,100);
//gets(buf_r);
fgets(buf_r,100,stdin);
strncat(buf,buf_r,strlen(buf_r)-1);
//strcat(buf,time_str);
//printf("---%s\n",buf);
if((sendbytes = send(clientfd,buf,strlen(buf),0)) == -1)
{
perror("send\n");
exit(1);
}
}
else if(pid == 0)
{
memset(buf,0,100);
if(recv(clientfd,buf,100,0) <= 0)
{
perror("recv:");
close(clientfd);
raise(SIGSTOP);
exit(1);
}
printf("%s\n",buf);
}
else
perror("fork");
}
close(clientfd);
return 0;
}Can you help to modify this from using Sockets to using Pipes and
Daemon Processes?
posted on 2011-06-24 15:46
ApolloDeng 閱讀(668)
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