PGExec returns error without any comment

Hi,

Following code fails at PQExec. I am using PQerrorMessage() function to print error message but no output. Error code is 2. What could be the problem with select query? I tried with "drop table" it worked.

[root(at)hq src]# ./1
PQExec failed(2):

1.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <libpq-fe.h>

int main()
{
char *conninfo;
PGconn *conn;
PGresult *res;

/* Prepare connection info */
conninfo = (char *) malloc(64);
if (conninfo == NULL) {
fprintf(stderr, "malloc error: %s\n", strerror(errno));
return -1;
}

memset(conninfo, 0, 64);
strncpy(conninfo, "dbname=llist user=yyy password=xxx", 63);

/* Make a connection to the database */
conn = PQconnectdb(conninfo);

/* Check to see that the backend connection was successfully made */
if (PQstatus(conn) != CONNECTION_OK)
{
fprintf(stderr, "Connection to database failed: %s", PQerrorMessage(conn));
return -1;
}

res = PQexec(conn, "select * from lists;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "PQExec failed(%d): %s\n", PQresultStatus(res), PQerrorMessage(conn));
PQclear(res);
return -1;
}

PQclear(res);

PQfinish(conn);

return 0;
}

---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.