Problem on using DNSGetHostname()

Titus,

thank you very much for your support !

some more info:

this is body of function :

/*-------------------------------------------------------------------- */
/* DNSGetHostname */

/* Requests the hostname which matches the IPHost supplied to SetConfig, */
/* or uses the first IP address found in the system if SetConfig was */
/* not supplied with a host address. The hostname is copied into the */
/* buffer pointed to by 'pNameBuf' with a max size of 'size'. */
/* NULL terminates the name when space allows. */

/* Returns 0 if OK, or error code */
/*-------------------------------------------------------------------- */
int DNSGetHostname( char *pNameBuf, int size )
{
    IPN    IPAddr = 0;
    char   *tmpbuf;
    int    errcode;

    /* This call is just about the same as DNSGetHostByAddr, only */
    /* with our IP address. */

    /* Get the best IP address for this system */
    /* If we don't have an IP address, then don't copy a name */
    if( !NtGetPublicHost( &IPAddr, 0, 0 ) )
    {
        if( size > 0 )
            *pNameBuf = 0;
        return(0);
    }

    /* Allocate a scrap buffer for the resolver */
    tmpbuf = mmAlloc( 1024 );
    if( !tmpbuf )
        return( MEMERROR );

    /* Now we can call DNSGetHostByAddr */
    errcode = DNSGetHostByAddr( IPAddr, tmpbuf, 1024 );

    /* If there's no error, copy the name (if we have one) */
    if( !errcode )
    {
        HOSTENT *ph = (HOSTENT *)tmpbuf;

        if( strlen( ph->h_name ) < (uint)size )
            strcpy( pNameBuf, ph->h_name );
        else
            strncpy( pNameBuf, ph->h_name, size-1 );
    }

    /* Free the temp buffer */
    mmFree( tmpbuf );

    return( errcode );
}

and i think value return from this part:

    if( !NtGetPublicHost( &IPAddr, 0, 0 ) )
    {
        if( size > 0 )
            *pNameBuf = 0;
        return(0);
    }

i check this function separately and see IPAddr is empty although in run time , i can ping EVM ip without problem  ! 

thanks

Ebi

Hi Titusrathinaraj Stalin and others

by create a thread and call NtGetPublicHost() after NC_netStart() , i can get IP correctly but DNSGetHostname() return 19 (NODNSREPLY 19 No DNS server response) .

i work on this problem and glad to hear your suggestions...

thanks

Ebi

Hi

after some effort , i stop work on problem because i think hostname not necessary for my project !

but i need DNSGetHostname() now.

any update for this problem?

update:

more info : i using static ip 

char *HostName    = "tidsp";
char *LocalIPAddr = "170.170.170.35";//EA: 192.168.1.4 -> 192.168.5.8
char *LocalIPMask = "255.255.255.0";    // Not used when using DHCP
char *GatewayIP   = "170.170.170.1";    // Not used when using DHCP EA: 192.168.1.1 -> 192.168.5.1
char *DomainName  = "demo.net";         // Not used when using DHCP
char *DNSServer   = "0.0.0.0";          // Used when set to anything but zero
char *PC_IPAddr = "170.170.170.17";

i try to add external DNS server to my project by setting the "External DNS server address" in XGConf's "TI-RTOS->Products->NDK->Application Layer->DNS-Module Settings" page .related line in .cfg :

//Dns.externDnsServIp = "8.8.8.8";
Dns.externDnsServIp = "170.170.170.1";
var dns0Params = new Dns.Params();
dns0Params.IfIdXValid = true;
dns0Params.mode = 15;
dns0Params.ResolveIP = true;
dns0Params.CallByIP = true;
dns0Params.RestartIPTerm = true;
var dns0 = Dns.create(dns0Params);

but DNSGetHostname() return 19 . i attach simple project (modified version of NIMU_emacExample_EVMC6678C66BiosExampleProject ) for reproduct problem.

NIMU_Rebiuld_1.rar

thanks

Ebi

Hi again

some more info:

i think after change from dhcp to static IP i forget some config

in G.3.7 section of NDK spru524i.pdf said :

"First, when the standard DHCP client is executing, it will take full control over the first 256 Item values. It

fills in the entries when it obtains its address lease, and purges them when the lease expires. There is a
set of default entries that the DHCP client will always request. Additional information requests can be
made by configuring the DHCP client, and the resulting replies will be added to the configuration.
Second, when there is no DHCP client service, the network application must manually write values to the
configuration for the Item values it views as important. A minimum configuration would include hostname,
domain name, and a list of domain name servers. Note that multiple IP addresses should be stored as
multiple instances of the same Item, not concatenated together with a longer byte length."

any body can suggest me example for add manually config host name?

in this E2E post problem solved by increase stack size but my stack size seem OK

thanks

Ebi