I have attached the code for reading and writing image in TCP/IP, could anyone sort me out this problem

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>          
#include <netdb.h>

#define LENGTH 5000

void error(const char *msg)
{
	perror(msg);
	exit(1);
}

int main ()
{
	/* Defining Variables */
	int sockfd; 
	int nsockfd; 
	int num;
	int sin_size, PORT; 
	struct sockaddr_in addr_local; /* client addr */
	struct sockaddr_in addr_remote; /* server addr */
	char revbuf[LENGTH]; 		// Receiver buffer

	/* Get the Socket file descriptor */

	if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 )
	{
		fprintf(stderr, "ERROR: Failed to obtain Socket Descriptor: (errno = %d) \n", errno);
		exit(1);
	}
	else 
		printf("[Server] Obtaining socket descriptor successfully.\n");

	/* Fill the client socket address struct */
	addr_local.sin_family = AF_INET;          // Protocol Family
	addr_local.sin_port = htons(6777);        // Port number
	addr_local.sin_addr.s_addr = INADDR_ANY;  // AutoFill local address
	bzero(&(addr_local.sin_zero), 8);         // Flush the rest of struct

	/* Bind a special Port */
	if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
	{
		fprintf(stderr, "ERROR: Failed to bind Port. (errno = %d)\n", errno);
		exit(1);
	}
	else 
		printf("[Server] Binded tcp port %d in addr sucessfully.\n",PORT);

	/* Listen remote connect/calling */
	if(listen(sockfd,8) == -1)
	{
		fprintf(stderr, "ERROR: Failed to listen Port. (errno = %d)\n", errno);
		exit(1);
	}
	else
		printf ("[Server] Listening to the port %d successfully.\n", PORT);

	int success = 0;
	while(success == 0)
	{
		sin_size = sizeof(struct sockaddr_in);

		/* Wait for a connection and obtain a new socket file despriptor for single connection */

		if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == 1)
		{
		    fprintf(stderr, "ERROR: Obtaining new Socket Despcritor. (errno = %d)\n", errno);
		    exit(1);
		}
		 else
    		    printf("[Server] Server has got connected from %s.\n", inet_ntoa(addr_remote.sin_addr));

		/*Received File from Client */
		char* fr_name = "/home/sosdt011/Desktop/imagenew.png";
		FILE *fr = fopen(fr_name, "w");
		if(fr == NULL)
		{
			printf("File %s Cannot be opened file on server.\n", fr_name);
		}
		else
		{
			//bzero(revbuf, LENGTH); 
			int fr_block_sz = 0;
			while((fr_block_sz = recv(nsockfd, revbuf, LENGTH,0)) > 0) 
			{
				int write_sz = fwrite(revbuf, 1 , fr_block_sz , fr); // use actual size of buffer
				if(write_sz < fr_block_sz)
				{
					error("File write failed on server.\n");
				}
		    	        bzero(revbuf,LENGTH);
			    	if (fr_block_sz == 0 ) 
			    	{
           				break;
			    	}
			}
			if(fr_block_sz < 0)  
		        {
		        	if (errno == EAGAIN)
	        		{
		                	printf("recv() timed out.\n");
     	                	}
	            		else
	            		{
	                		fprintf(stderr, "recv() failed due to errno = %d\n", errno);
		 			exit(1);
	            	        }
        		}
			printf("Ok received from client!\n");
			fclose(fr); 
		}
	    	success = 1;
	    	close(nsockfd);
	    	printf("[Server] Connection with Client closed. Server will wait now...\n");
	    	while(waitpid(-1, NULL, WNOHANG) > 0);
	}
}