quick skit

struct arg_struct {
   char name[256];
   int  connfd;
}
void *file_receiver(void *);

int main() {

// ....

struct sockaddr_in client;
int c;
pthread_t thread_id;
struct arg_struct argumen;

while(1)
{
   connfd = accept(listenfd, (struct sockaddr*)&client, (socklen_t*)&c);
   bytesReceived = read(connfd, recvBuff, 256);

   memset(&argumen, 0, sizeof(argumen));
   strncpy(argumen.name, recvBuff, 255);
   argumen.connfd = connfd

   if (pthread_create(&thread_id, NULL, file_receiver, (void*) &argumen) < 0)
   {
      perror("could not create thread");
      return 1;
   }
}

// ....
}

void *file_receiver(void * arg)
{
   char buffer[256];
   int n;
   arg_struct argumen = *((arg_struct*)arg);
   FILE *fp = fopen(argumen.name, "rw");
   if (NULL == fp)
   {
      printf("Error opening file");
      return;
   }

   while ((n = read(argumen.connfd, buffer, sizeof(buffer)-1)) > 0)
   {
      fwrite(buffer, 1, buffer, fp);
   }

   if (n < 0)
      printf("\nRead error\n");

   fclose(fp);
   close(argumen.connfd);
   sleep(1);
}