HP-UX IP Address and Client Management Administrator's Guide (October 2009)

The set_resfield() API
The syntax for the set_resfield function is as follows:
set_resfield(int field, void *value)
The set_resfield() function contains two parameters: field and *value. You can set the
resolver option using the field parameter and the value for the field using the value parameter.
The set_resfield() function returns either 0 or -1. It returns a value0 if the function
successfully sets the value for the resolver option in the instance of the_res_state structure,
which holds all the resolver options. A value of -1 denotes a failure to set the resolver option.
The get_resfield() API
The syntax for the get_resfield() function is as follows:
get_resfield(int field, void *value, sizeof value)
The get_resfield() function contains three parameters: field, *value, and value. The
parameter field contains the resolver option. The parameter *value is the pointer to the
location where the option value is stored. The value parameter specifies the memory (in bytes)
allocated for a variable when a function is invoked.
The get_resfield() function returns either 0 or -1. It returns a value of 0 if the function
successfully gets the value of the field in the value parameter and returns a value -1 on failure.
Sample Program with Timeout Values
A sample program with timeout values is as follows:
main()
{
int retrans = 600;
int retry =1;
struct hostent *hp;
struct in_addr ia;
char *name = “localhost”;
res_init();
set_resfield(RES_RETRANS, &retrans);
set_resfield(RES_RETRY, &retry);
hp = gethostbyname (name);
if (hp == NULL )
{
printf (“gethostbyname failed\n”);
herror(“Error”);
}
else
{
int i;
for (i=o; hp->h_addr_list[i]; i++)
{
memcpy((caddr_t)&ia, hep->h_addr_list[i],\
sizeof(ia));
printf(“%s”, inet_ntoa(ia));
}
}
get_resfield (RES_RETRANS, &retrans, sizeof retrans);
get_resfield (RES_RETRY, &retry, sizeof retry);
printf (“retry = %d \n retrans = %d\n”, retry,retrans);
}
Starting the Name Server Daemon
The name server daemon, /usr/sbin/named, must be running on all the master, slave, and
caching-only name servers. If you have configured your system to query a remote name server
84 Configuring and Administering the BIND Name Service