[BUG] in glibc-2.1.1-6b: gethostbyname broken

Martin Costabel costabel at wanadoo.fr
Sat May 8 22:20:59 EST 1999

Under glibc-2.1.1-6b, I cannot do an NFS-mount using the numeric IP
address of the server. Without even consulting the net, mount says:
  mount: can't get address for xx.xx.xx.xx

Under glibc-2.1.1-5b, it works correctly.

I tracked this down to gethostbyname, which doesn't work correctly when
fed a numeric IP address.

If I run the the attached program as
I get a correct result when glibc-2.1.1-5b.ppc.rpm is installed, and an
error when glibc-2.1.1-6b.ppc.rpm is installed. Both rpms are from

Could someone who knows what changed between 5b and 6b please look into

-------------- next part --------------
/* tstgethbn.c
   Test for gesthostbyname */

#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char** argv)
   char hostname[65];
   struct hostent *he = NULL;
   struct hostent *he2 = NULL;
   extern int h_errno;
   strcpy(hostname, argv[1]);
   printf( " Looking up %s\n", hostname );
   he = gethostbyname(hostname);
   if ( h_errno ) {
       printf(" error %d\n", h_errno);

   if ( he == NULL ){
       printf("No hostname found\n");

    printf( "\t      Hostname: %s\n", he->h_name );
   if ( he->h_addr_list[0] != NULL )
     printf("\t       Address: %s \n", 
	    inet_ntoa(*(struct in_addr *) he->h_addr_list[0]));

   he2 = gethostbyaddr( he->h_addr_list[0], he->h_length, he->h_addrtype );
   printf( "\t          Name: %s\n", he2->h_name );


More information about the Linuxppc-dev mailing list