giúp đỡ về foking server trong linux

do mình post code toàn bị lỗi, code dài toàn copy, nên gửi link cho các bạn dễ nhìn
client http://codepad.org/G4FLkcV4
server http://codepad.org/PAAC88Wv

Bạn edit lại dùng markdown đi

Làm sao để có thể hiển thị syntax highlighting bằng markdown? Các bạn phải đánh dấu ``` như ví dụ dưới đây Chú ý, dấu ``` được tạo ra bởi nút nằm bên trái số 1 trên bàn phím, nút này sẽ là ~ khi bấm giữ Shift Ví dụ cho C Nội dung: ``` void main() { } ``` Và đừng quên ``` ở cuối Kết quả void main() { } Ví dụ cho Pascal Nội dung: ``` Program HelloWorld; Begin WriteLn('Hello world!') {no ";" is required after the last statement of a block - adding one adds a "null stateme…

client.c

#include<stdio.h>
#include <string.h>   
#include <sys/socket.h>  
#include <arpa/inet.h> 
 
int main(int argc , char *argv[])
{
    int sock,sent_size,sum;
    sum =0;
    char c;
    struct sockaddr_in server;
    char sendbuff[1000] , recvbuff[2000];
     
    //Create socket
    sock = socket(AF_INET , SOCK_STREAM , 0);
    if (sock == -1)
    {
        printf("[Client]: Could not create socket");
    }
    puts("[Client]: Socket created");
     
    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons(5500);
 
    //Connect to remote server
    if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        perror("[Client]: Connect failed. Error");
        return 1;
    }
     
    puts("[Client]: Connected\n");
     
    //keep communicating with server
    while(1)
    {
        printf("[Client]: Enter message : ");
        fgets(sendbuff,100,stdin);
        if(strlen(sendbuff)==2){
        sendbuff[strlen(sendbuff)-1] = '\0';
    }
        if((strcmp(sendbuff,"Q")==0)||(strcmp(sendbuff,"q")==0))
            break;
        //Send  data
        if( (sent_size=send(sock , sendbuff , strlen(sendbuff) , 0)) < 0)
        {
            puts("[Client]: Send failed");
            return 1;
        }
        sum = sum +sent_size;
         
        //Receive a reply from the server
        if( recv(sock , recvbuff , 2000 , 0) < 0)
        {
            puts("[Client]: Recv failed");
            break;
        }
         
        puts("Server reply :");
        puts(recvbuff);
        bzero(recvbuff,strlen(recvbuff));
    }
    printf("[Client]: Count sent byte : %d bytes\n",sum); 
    close(sock);
    return 0;
}

còn đây là server

#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<signal.h>
void touppers(char*s){
int i;
for (i=0;i s[i] = toupper(s[i]);
}
void sig_chld(int signo)
{
pid_t pid;
int stat;
while ( (pid = waitpid(-1, &stat, WNOHANG)) > 0)
printf("child %d terminated\n", pid);
return;
} 
int main(int argc, char const *argv[])
{
int socket_desc, client_sock, c, read_size;
struct sockaddr_in server, client;
char client_message[2000];
//create SOcket
socket_desc = socket(AF_INET,SOCK_STREAM,0);
if(socket_desc == -1){
printf("could not create socket\n");
}
puts("socket create");
// set the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons(5500);
//bind
if(bind(socket_desc,(struct sockaddr*)&server,sizeof(server))<0){
perror("bind failed.Error");
return 1;
}
puts("Bind done!");
//listen
listen(socket_desc,3);
void doit(int client_sock,char *client_message){
int read_size;
while(read_size = recv(client_sock,client_message,2000,0)>0){
touppers(client_message);
write(client_sock,client_message,strlen(client_message));
}
}
//accept connection from client
puts("Waiting for incoming client");
c = sizeof(struct sockaddr);
pid_t pid;
signal(SIGCHLD,sig_chld);	
// loop
for( ; ; ){
client_sock = accept(socket_desc,(struct sockaddr *)&client,(socklen_t)&c);
if((pid = fork() ==0)){
close(socket_desc);
doit(client_sock,client_message);
exit(0);
}
close(client_sock);
}
}