I Am Getting A File Named Core When I Run A C Code In Ubuntu.

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C

Ubuntu

file

Hi,

The scenario involved is i have designed a UI for a C code. I should send the data to server, the communication is done via tcp/ip. In the first step, the server has to open the socket to accept the data, so when i run the server code, i am getting the connection accepted and "segmentation fault" error is thrown and connection is automatically closed. How to keep the connection open till the data is sent from the client. I have used TCP as communication protocol.

Also a file named "core" is generated in the folder where source code is there. How to resolve this issue.

 #include "SingleDirectionCServer.h"
 #include<jni.h>
 #include<stdio.h>
 #include<string.h>    
 #include<stdlib.h>
 #include<unistd.h>
 #include<sys/ioctl.h>
 #include<sys/types.h>
 #include<arpa/inet.h>    
 #include<sys/socket.h> 

 //using namespace std;

 //This function is to be used once we have confirmed that an video is to be sent
 //It should read and output an video file

long long int receive_video(long long int socket,const char *file)

 {

	long long int buffersize = 0, recv_size = 0,size = 0, read_size, write_size;

	char videoarray[10240],verify = '1',errno;

	FILE *video;

	//Find the size of the video

	read(socket, &size, sizeof(int));

	//Send our verification signal

	write(socket, &verify,sizeof(char));

	//Make sure that the size is bigger than 0

	if(size <= 0 )

 	{

        	printf("Error has occurred. Size less than or equal to 0 \n");
        	return -1;

 	}

		video = fopen(file, "w");

		if( video == NULL) 

	{

	        printf("Error has occurred. video file could not be opened \n");
	        return -1;

        }

		//Loop while we have not received the entire file yet

		while(recv_size < size) 

        {

                ioctl(socket, FIONREAD, &buffersize); 

        	//We check to see if there is data to be read from the socket    

	        if(buffersize > 0 ) 

	{

       		 if(read_size = read(socket, videoarray, buffersize) < 0){
       		 printf("%s", strerror(errno));

        }

       		 //Write the currently read data into our video file

        	write_size = fwrite(videoarray,1,(buffersize), video);

       /* if(write_size != buffersize) 
     
        {

          printf("write and buffer sizes are wrong \n");

        }

        if(read_size != write_size) 

        {

            printf("error in read write \n");

        }  */

        //Increment the total number of bytes read

        recv_size += read_size;

        //Send our handshake verification info

        write(socket, &verify, sizeof(char));

      }
  }

	fclose(video);
	printf("video successfully Received! \n");
	return 0;
 }

JNIEXPORT jint JNICALL Java_SingleDirectionCServer_input
  (JNIEnv *env, jobject obj, jint port, jstring file)
	{

		long long int socket_desc;
		struct sockaddr_in server;
		char *parray,errno;
		const char *clocation = (*env)->GetStringUTFChars(env, file, NULL);

		//Create socket

		socket_desc = socket(AF_INET,SOCK_STREAM,0);

		if (socket_desc == -1) 

		{

  			  printf("Could not create socket \n");

		}

		          memset(&server,0,sizeof(server));
			  server.sin_addr.s_addr = htonl(INADDR_ANY);	  
			  server.sin_family = AF_INET;
			  server.sin_port = htons(port); 

		//Connect to remote server

			  if (connect(socket_desc,(struct sockaddr *)&server , sizeof(server))) 

		    	  {


			//   printf(strerror(errno));
   				
			//printf("Connect Error \n");

    			 //return 1;
		
			puts("Connected \n");
       }

			 

			 receive_video(socket_desc,clocation);

			 close(socket_desc);

                         //return 0;
	}