Thread: warning: comparison is always false due to limited range of data type

hello,
this is my define declaration

PHP Code:

 #define CLEANUP_INTERVAL 1000 


and this is my function body. here getting warning like this

PHP Code:

 warning: comparison is always false due to limited range of data type 


how can i over come this problem.

Code:

void
descry(u_char *u, struct pcap_pkthdr *phdr, u_char *packet)
{
    struct libnet_ipv4_hdr *ip;
    struct libnet_tcp_hdr *tcp;
    struct descry_pack *gp;
    struct tcp_connection *c;
    struct tcp_connection *rc;
    static u_char cleanup = 0;
    struct timeval ts;

    rc = NULL;
    c = NULL;
    gp = (struct descry_pack *)u;

    /*
     *  In order to keep the trie from growing boundlessly, we need to
     *  periodically expire half open connections.
     */
 

	
PHP Code:
	

  if (cleanup++ > CLEANUP_INTERVAL) 



    {
        ts.tv_usec = phdr->ts.tv_usec;
        ts.tv_sec  = phdr->ts.tv_sec;

        /* expire old connections */
        pt_expire(gp, &ts);
        cleanup = 0;
    }

basically using this program i want to scan TCP ip protocal.
I need your feedback.
regards
Nasim

why dont u use int rather than char, unsigned char can hold up to 255 that it . Look into limit.h. Use int rather than char. That should get rid of your warning.

ssharish