#include "socket_includes.h"
#include <signal.h>


int mz_ipv4_tcp_create_socket(void)
{
    int listenfd, sockfd, opt = 1;
    struct sockaddr_in server, client;
    socklen_t len;
    int timep;
    int ret;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);
    if(listenfd < 0){
        perror("Create socket fail.");
        return -1;
    } 

    if((ret = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) < 0){
        perror("Error, set socket reuse addr failed");  
        return -1;
    }

    bzero(&server, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port   = htons(SERV_PORT);
    server.sin_addr.s_addr  = htonl(INADDR_ANY);
    
    len = sizeof(struct sockaddr);
    if(bind(listenfd, (struct sockaddr *)&server, len)<0){
              perror("bind error.");
        return -1;
    }
    
      
    listen(listenfd, MAX_LISTEN_QUE);

    return listenfd;
}

int mz_process_data(int sockfd)
{
    int bytes;
    char buf[MAX_BUFFER_SIZE], read_buf[MAX_BUFFER_SIZE];

    memset(read_buf, 0x00, MAX_BUFFER_SIZE);
    memset(buf, 0x00, MAX_BUFFER_SIZE);

    while(1){
        
        bytes = recv(sockfd, read_buf, 100, 0);
        if(bytes < 0){
            printf("read err.\n");
            return -1;
        }
        if(bytes == 0){
            printf("client connection closed.\n");
            return 0;
        }
        printf("Bytes:%d\n", strlen(read_buf));
        printf("read_buf: %x %x %x \n", read_buf[0], read_buf[1], read_buf[2]);

        send(sockfd, read_buf, bytes, 0);

        if(!strcmp(read_buf, "q")){
            break;
        }
        if(!strcmp(read_buf, "c")){
            printf("i love you.\n");
            sprintf(read_buf, "%s","i love you.\n" );
            send(sockfd, read_buf, bytes, 0);
        }
    }
    close(sockfd);
    return 0;
}

int mz_process_signal(int signo)
{
    switch(signo){
        case SIGCHLD:
            printf("dddddddddd\n");
            while(waitpid(-1, NULL, WNOHANG)>0);    
        break;
    }
}

int mz_set_signal_handler(void)
{
    struct sigaction act, oact;
    act.sa_handler = (void *)mz_process_signal;
    sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
    act.sa_flags |= SA_RESTART;
    if(sigaction(SIGCHLD, &act, &oact) < 0){
        return -1;
        }
        return 0;
}

int main(int argc, char *argv[])
{
    int listenfd, sockfd;
    struct sockaddr_in server, client;
    socklen_t len;
    int bytes =0 ;

    
    mz_set_signal_handler();
    
    len = sizeof(struct sockaddr);
    
    listenfd = mz_ipv4_tcp_create_socket();
    
    while(1){
        sockfd = accept(listenfd, (struct sockaddr *)&client, &len);
        if(sockfd < 0){
            perror("accept error.");
            return -1;
        }

        printf("sockfd=%d\n", sockfd);
        printf("IP: 0x%x, Port:%d\n", ntohl(client.sin_addr.s_addr), ntohs(client.sin_port));
        if(fork() == 0){
            close(listenfd);
            mz_process_data(sockfd);
            exit(0);
        }
        close(sockfd);
      

    }
    return 0;
}











#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>


#include <unistd.h>
#include <fcntl.h>



#define MAX_LISTEN_QUE 5


#define SERV_PORT 8888

#define MAX_BUFFER_SIZE 100