c Remove from memory

Hello ,


I want to create a function to remove an element from IP4Map with matching ip4 but i could not succeded should any body help me ?

typedef struct IP4SYN{
     unsigned int ip4;
     unsigned int count;
	 unsigned int source_port;
	 unsigned int dest_port;
	 unsigned int dest_IP;
     long int SYN_Son;
     size_t s;
     size_t n;
} IP4SYN;

typedef struct IP4Map{
      IP4SYN * a;
      size_t s;
      size_t n;
} IP4Map;
unsigned int AddIP4ToMap(IP4Map * ip4map,unsigned int ip4,unsigned int source_port,unsigned int dest_port,unsigned int dest_IP){
       unsigned int pos =  0;
       if (ip4map->n >= ip4map->s)
       {
              ip4map->a = (IP4SYN *)krealloc( ip4map->a, ip4map->s+blocksize,GFP_NOWAIT);
              memset(&ip4map->a[ip4map->s], 0, sizeof(IP4SYN)*blocksize);
              ip4map->s += blocksize;
       }
       pos = FindIP4InMap(ip4map, ip4,source_port,dest_port,dest_IP);
       if (ip4map->n > pos)
       {
             if((ip4map->a[pos].ip4==ip4)&&(ip4map->a[pos].source_port==source_port)&&(ip4map->a[pos].dest_port==dest_port)&&(ip4map->a[pos].dest_IP==dest_IP)){
					ip4map->a[pos].SYN_Son=Zaman_MS();
					return ++ip4map->a[pos].count;  // increment counter
             }
             else  // shift entries 1 to the right from pos 
             {
                    unsigned int shift = (ip4map->n - pos)-1;
                    if (shift > 0)
                    {
                          memmove(&ip4map->a[pos+1], &ip4map->a[pos], shift);
                    }
             }
        }
        ip4map->a[pos].ip4 = ip4;
        ip4map->a[pos].source_port = source_port;
        ip4map->a[pos].dest_port = dest_port;
        ip4map->a[pos].dest_IP = dest_IP;
        ip4map->a[pos].SYN_Son = Zaman_MS();
        ip4map->a[pos].count = 1;
        ip4map->n++;
        return 1;
}

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