I have a C to postgres question.

I'm hoping it's okay to post this kind of thing here.  There's
no newsgroup, cruising the FAQs didn't turn up anything--or
I missed it.

The database has 4 values; I can see them when I get into the d.b.
via:
	psql test
and, using (cut and paste) the string the C program uses to select,
from "psql test" I see the four values.
The string, I suppose, must be okay.   Furthermore, if I turn on
tracing in the C program, I believe I see the four values being printed.
That makes me think the select statement syntax is correct.
However, my C program thinks it got 0 rows.  And I can't retrieve anything.
So I think the problem is in my C code.  I printed the online man
pages, it looks okay to me.
Here's the code fragment:
/*-----------------------------------------------*/
sprintf(select_stmt, "SELECT m_id FROM machines WHERE hostname = '%s'", 
node);
fprintf(stderr,"trying this: %s\n", select_stmt);
/*____________________________________________________________________________*/
igot = PQsendQuery(conn_to_db,select_stmt);
fprintf(stderr,"igot from query is %d\n", igot );
seek_m_id = PQgetResult(conn_to_db);

estgot =  PQresultStatus( seek_m_id );

fprintf(stderr,"estgot from PQgetResult is %d\n", estgot );

while( seek_m_id != NULL )
        {
        fprintf(stderr,"seek_m_id != NULL\n");
        seek_m_id = PQgetResult(conn_to_db);
        estgot =  PQresultStatus( seek_m_id );
        tmwh( estgot );
        /* i suppose nrows could keep coming back as 1 */
        nrows = PQntuples( seek_m_id );
        fprintf(stderr,"nrows = %d\n", nrows );
        for(jj=0;jj