check6a

Script started on 2020년 11월 30일 (월) 오전 11시 34분 39초
[?1034hnetpa15@~/ 997$ cat prog/tcp_chatserv_nonb.c
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/file.h>
#include <errno.h>
#include <strings.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>


#define MAXLINE 511
#define MAX_SOCK 1024

char *EXIT_STRING = "exit";
char *START_STRING = "Connected to chat_server \n";
int maxfdp1; 
int num_chat = 0;
int clisock_list[MAX_SOCK]; 
int listen_sock; 

void addClient(int s, struct sockaddr_in *newcliaddr);
void removeClient(int s); 
int tcp_listen(int host, int port, int backlog);
void errquit(char *msg) { perror(msg); exit(1); }
int set_nonblock(int sockfd);
int is_nonblock(int sockfd);


int main(int argc, char *argv[]) {
        struct sockaddr_in cliaddr;
        int i, j, nbyte, count;
        int addrlen;
        int accp_sock, clilen;
        char buf[MAXLINE];

        if(argc != 2) {
                printf("Usage : %s port\n", argv[0]);
                exit(0);
        }

        listen_sock = tcp_listen(INADDR_ANY, atoi(argv[1]), 5);
if(listen_sock==1)
errquit("tcp_listen fail");
if(set_nonblock(listen_sock)==-1)
errquit("set_nonblock fail");

for(count=0; ; count++){
if (count==1000000){
putchar('.');
fflush(stdout);
count=0;
}

addrlen=sizeof(cliaddr);
accp_sock=accept(listen_sock, (struct sockaddr*)&cliaddr, &clilen);

if(accp_sock==-1 && errno!=EWOULDBLOCK)
errquit("accept fail");
else if (accp_sock>0){
clisock_list[num_chat]=accp_sock;
if(is_nonblock(accp_sock)!=0 &&set_nonblock(accp_sock)<0)
errquit("set_nonblock fail");
addClient(accp_sock,&cliaddr);
send(accp_sock,START_STRING,strlen(START_STRING),0);
printf("%d번째 사용자 추가.\n",num_chat);
}

for(i=0; i<num_chat; i++){
    errno=0;
    nbyte=recv(clisock_list[i],buf,MAXLINE,0);
    if(nbyte==0){
        removeClient(i);
        continue;
    }
    else if (nbyte==-1&&errno==EWOULDBLOCK)
    continue;
    if(strstr(buf,EXIT_STRING)!=NULL){
        removeClient(i);
        continue;
    }
    buf[nbyte]=0;
    for (j=0; j<num_chat; j++)
    send(clisock_list[j],buf,nbyte,0);
    printf("%s\n",buf);


}
}

}

void addClient(int s, struct sockaddr_in *newcliaddr) {
        char buf[20];
        inet_ntop(AF_INET, &newcliaddr->sin_addr, buf, sizeof(buf));
        printf("new client : %s\n", buf);
        clisock_list[num_chat] = s;
        num_chat++;
}

void removeClient(int s) {
        close(clisock_list[s]);
        if(s != num_chat-1)
                clisock_list[s] = clisock_list[num_chat-1];
        num_chat--;
        printf("참가자 1명 탈퇴. 현재 참가자 수 = %d\n", num_chat);
}

int is_nonblock(int sockfd){
    int val;
    val=fcntl(sockfd,F_GETFL,0);
    if(val&O_NONBLOCK)
    return 0;
    return -1;

}

int set_nonblock(int sockfd){
    int val;
    val=fcntl(sockfd,F_GETFL,0);
    if(fcntl(sockfd,F_SETFL,val | O_NONBLOCK)==-1)
    return -1;
    return 0;

}

int tcp_listen(int host, int port, int backlog) {
        int sd;
        struct sockaddr_in servaddr;

        sd = socket(AF_INET, SOCK_STREAM, 0);
        if(sd == 1) {
                perror("socket fail");
                exit(1);
        }

        bzero((char *)&servaddr, sizeof(servaddr));
        servaddr.sin_family = AF_INET;
        servaddr.sin_addr.s_addr = htonl(host);
        servaddr.sin_port = htons(port);

        if(bind(sd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
                perror("bind fail");
                exit(1);
        }

        listen(sd, backlog);
        return sd;
}
netpa15@~/ 998$ prog/tcp_chatserv_nonvb.c 8015
...........................new client : 0.0.0.0
1번째 사용자 추가.
..............new client : 117.17.142.162
2번째 사용자 추가.
...[b15] : netpa15

...[c15] : Ok receive

....[b15] : Ok confirm

...참가자 1명 탈퇴. 현재 참가자 수 = 1
.^C
netpa15@~/ 999$ ls -l prog/tcp_chatserv_non*
-rwxr-xr-x. 1 netpa15 student 14120 11월 30 11:31 prog/tcp_chatserv_nonb
-rw-r--r--. 1 netpa15 student  3599 11월 30 11:30 prog/tcp_chatserv_nonb.c
netpa15@~/ 1000$ exit

Script done on 2020년 11월 30일 (월) 오전 11시 37분 14초