과제1 , 과제2

과제1 mpserver.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <pthread.h>
 
#define BUF_SIZE 1024
 
typedef struct MultipleArg
{
    int clnt_sock;
    char buf[BUF_SIZE];
    int str_len;
}Mp;
 
pthread_mutex_t mtx;
 
void error_handling(char *message);
void read_childproc(int sig);
void* write_thread(void *arg);
 
int main(int argc, char *argv[])
{
    Mp *mp;
    mp = (Mp *)malloc(sizeof(Mp));
 
    int serv_sock, clnt_sock;
    struct sockaddr_in serv_adr, clnt_adr;
    
    pid_t pid;
    struct sigaction act;
    socklen_t adr_sz;
    int str_len, state;
    char buf[BUF_SIZE];
    if(argc!=2) {
        printf("Usage : %s <port>\n", argv[0]);
        exit(1);
    }
 
    act.sa_handler=read_childproc;
    sigemptyset(&act.sa_mask);
    act.sa_flags=0;
    state=sigaction(SIGCHLD, &act, 0);
    serv_sock=socket(PF_INET, SOCK_STREAM, 0);
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;
    serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
    serv_adr.sin_port=htons(atoi(argv[1]));
    
    if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr))==-1)
        error_handling("bind() error");
    if(listen(serv_sock, 5)==-1)
        error_handling("listen() error");
    
    while(1)
    {
        adr_sz=sizeof(clnt_adr);
        mp->clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_adr, &adr_sz);
        clnt_sock = mp->clnt_sock;    
        
        if(clnt_sock==-1)
            continue;
        else
            puts("new client connected...");
        pid=fork();
        if(pid==-1)
        {
            close(clnt_sock);
            continue;
        }
        if(pid==0)
        {
            close(serv_sock);
 
            
            pthread_t t_id;
 
            while((str_len=read(mp->clnt_sock, mp->buf, BUF_SIZE))!=0)
            {
                mp->str_len = str_len;
                pthread_create(&t_id, NULL, write_thread, (void *)mp);
                pthread_detach(t_id);
            }
            
            close(clnt_sock);
            puts("client disconnected...");
            return 0;
        }
        else
            close(clnt_sock);
    }
    close(serv_sock);
    return 0;
}
void* write_thread(void* arg)
{
    pthread_mutex_lock(&mtx);
    Mp *mp_arg = (Mp *)arg;
    write(mp_arg->clnt_sock, mp_arg->buf, mp_arg->str_len);
    pthread_mutex_unlock(&mtx);
}
 
void read_childproc(int sig)
{
    pid_t pid;
    int status;
    pid=waitpid(-1, &status, WNOHANG);
    printf("removed proc id: %d \n", pid);
}
void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
} 

 

과제2 chat_server

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>
#include <time.h>
#define BUF_SIZE 100
#define MAX_CLNT 256
 
void * handle_clnt(void * arg);
void send_msg(char * msg, int len);
void error_handling(char * msg);
 
int clnt_cnt=0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutx;
 
int main(int argc, char *argv[])
{
    int serv_sock, clnt_sock;
    struct sockaddr_in serv_adr, clnt_adr;
    int clnt_adr_sz;
    pthread_t t_id;
    if(argc!=2) {
        printf("Usage : %s <port>\n", argv[0]);
        exit(1);
    }
 
    pthread_mutex_init(&mutx, NULL);
    serv_sock=socket(PF_INET, SOCK_STREAM, 0);
 
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET; 
    serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
    serv_adr.sin_port=htons(atoi(argv[1]));
 
    if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr))==-1)
        error_handling("bind() error");
    if(listen(serv_sock, 5)==-1)
        error_handling("listen() error");
 
    while(1)
    {
        clnt_adr_sz=sizeof(clnt_adr);
        clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr,&clnt_adr_sz);
 
        pthread_mutex_lock(&mutx);
        clnt_socks[clnt_cnt++]=clnt_sock;
        pthread_mutex_unlock(&mutx);
 
        pthread_create(&t_id, NULL, handle_clnt, (void*)&clnt_sock);
        pthread_detach(t_id);
        printf("Connected client IP: %s \n", inet_ntoa(clnt_adr.sin_addr));
    }
    close(serv_sock);
    return 0;
}
 
void * handle_clnt(void * arg)
{
    int clnt_sock=*((int*)arg);
    int str_len=0, i;
    char msg[BUF_SIZE];
 
    while((str_len=read(clnt_sock, msg, sizeof(msg)))!=0)
        send_msg(msg, str_len);
 
 
    pthread_mutex_lock(&mutx);
    for(i=0; i<clnt_cnt; i++)   // remove disconnected client
    {
        if(clnt_sock==clnt_socks[i])
        {
            while(i++<clnt_cnt-1)
                clnt_socks[i]=clnt_socks[i+1];
            break;
        }
    }
    clnt_cnt--;
    pthread_mutex_unlock(&mutx);
    close(clnt_sock);
    return NULL;
}
 
void send_msg(char * msg, int len)   // send to all
{
    time_t now_time;
    struct tm *now_date;
    msg[len]='\0';
    char buf[100];
    time(&now_time);
    now_date=localtime(&now_time);
    strcpy(buf,asctime(now_date));
    buf[strlen(buf)-1]='\0';
 
 
    int i;
    pthread_mutex_lock(&mutx);
 
    FILE *fp=fopen("log.log","a");
 
    fprintf(fp,"%s%s",buf,msg);
    for(i=0; i<clnt_cnt; i++)
    {    
        write(clnt_socks[i], msg, len);    
    }
 
    fclose(fp);
 
    pthread_mutex_unlock(&mutx);
}
void error_handling(char * msg)
{
    fputs(msg, stderr);
    fputc('\n', stderr);
    exit(1);
}

 

chat_clnt.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> 
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <pthread.h>
    
#define BUF_SIZE 100
#define NAME_SIZE 20
    
void * send_msg(void * arg);
void * recv_msg(void * arg);
void error_handling(char * msg);
    
//char name[NAME_SIZE]="[DEFAULT]";
//char msg[BUF_SIZE];
 
struct Msg()
{
    char name[NAME_SIZE] = "[DEFAULT]";
    char msg[BUF_SIZE];
};
 
struct Msg msg;
int main(int argc, char *argv[])
{
    //struct msg msg;
    int sock;
    struct sockaddr_in serv_addr;
    pthread_t snd_thread, rcv_thread;
    void * thread_return;
    if(argc!=4) {
        printf("Usage : %s <IP> <port> <name>\n", argv[0]);
        exit(1);
     }
    
    sprintf(msg.name, "[%s]", argv[3]);
    sock=socket(PF_INET, SOCK_STREAM, 0);
    
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
    serv_addr.sin_port=htons(atoi(argv[2]));
      
    if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
        error_handling("connect() error");
    
    pthread_create(&snd_thread, NULL, send_msg, (void*)&sock);
    pthread_create(&rcv_thread, NULL, recv_msg, (void*)&sock);
    pthread_join(snd_thread, &thread_return);
    pthread_join(rcv_thread, &thread_return);
    close(sock);  
    return 0;
}
    
void * send_msg(void * arg)   // send thread main
{
    int sock=*((int*)arg);
    //char name_msg[NAME_SIZE+BUF_SIZE];
    while(1) 
    {
        fgets(msg, BUF_SIZE, stdin);
        if(!strcmp(msg,"q\n")||!strcmp(msg,"Q\n")) 
        {
            close(sock);
            exit(0);
        }
        sprintf(name_msg,"%s %s", name, msg);
        write(sock, name_msg, strlen(name_msg));
    }
    return NULL;
}
    
void * recv_msg(void * arg)   // read thread main
{
    int sock=*((int*)arg);
    char name_msg[NAME_SIZE+BUF_SIZE];
    int str_len;
    while(1)
    {
        str_len=read(sock, name_msg, NAME_SIZE+BUF_SIZE-1);
        if(str_len==-1) 
            return (void*)-1;
        name_msg[str_len]=0;
        fputs(name_msg, stdout);
    }
    return NULL;
}
    
void error_handling(char *msg)
{
    fputs(msg, stderr);
    fputc('\n', stderr);
    exit(1);
}