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Full Discussion: gethostbyname_r returns NULL when hostname has dash
Special Forums IP Networking gethostbyname_r returns NULL when hostname has dash Post 302195740 by uunniixx on Thursday 15th of May 2008 08:51:41 PM
Old 05-15-2008
gethostbyname_r returns NULL when hostname has dash
We have a code to find the DNS entry of a host that has a trailing '-' in its url (format example: mysite-.watch.com):

Code:
if(gethostbyname_r(host,host_ent,host_buffer,host_buffer_size,&host_error)==NULL) 
{
//failed
}

But when remove the '-' from the host name the code does not return failure. IE and nslookup works fine.

What we need to do in such a case?
Last edited by uunniixx; 05-15-2008 at 10:20 PM..
 

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LEARN ABOUT REDHAT

pvmfmstat

MSTAT(3PVM)							  PVM Version 3.4						       MSTAT(3PVM)

NAME

       pvm_mstat - Returns the status of a host in the virtual machine.

SYNOPSIS

       C    int mstat = pvm_mstat( char *host )

       Fortran	 call pvmfmstat( host, mstat )

PARAMETERS

       host    Character string containing the host name.

       mstat   Integer returning machine status:
		    value		MEANING
		    PvmOk		host is OK
		    PvmNoHost		host is not in virtual machine
		    PvmHostFail 	host is unreachable (and thus possibly failed)

DESCRIPTION

       The  routine  pvm_mstat returns the status mstat of the computer named host with respect to running PVM processes. This routine can be used
       to determine if a particular host has failed and if the virtual machine needs to be reconfigured. The function  pvm_notify()  can  also	be
       used to notify the caller that a host has failed.

EXAMPLES

       C:
	    mstat = pvm_mstat( "msr.ornl.gov" );

       Fortran:
	    CALL PVMFMSTAT( 'msr.ornl.gov', MSTAT )

ERRORS

       These error conditions can be returned by pvm_mstat

       PvmSysErr
	      pvmd not responding.

       PvmNoHost
	      giving a host name not in the virtual machine.

       PvmHostFail
	      host is unreachable (and thus possibly failed).

SEE ALSO

       pvm_notify(3PVM), pvm_config(3PVM)

								  30 August, 1993						       MSTAT(3PVM)
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