Someone

(gdb) set $foo = *passive_check_result_list
(gdb) print $foo.host_name
$7 = 0x899d508 "pih-mailc11-service"
(gdb) print $foo.description
There is no member named description.
(gdb) print $foo.output     
$8 = 0x8358518 "TCP OK - 0.032 second response time on port 11028|time=0.031829s;0.000000;0.000000;0.000000;10.000000"
(gdb) print $foo.svc_description
$9 = 0x82f4758 "POP3 - Yourideal"
(gdb) set $foo =$foo.next
(gdb) print $foo.host_name
$10 = 0x899de60 "pih-dhcp"
(gdb) set $foo =$foo.next
(gdb) print $foo.host_name
$11 = 0x81cee60 "FTP"
(gdb) print $foo.svc_description
$12 = 0x8161d38 "BTRIServiceStatus FTP"
(gdb) print $foo.output     
$13 = 0x8339ba0 "FTP OK - 0.011 second response time on port 21 [220 BT Service Status FTP Server #5 ready]|time=0.011338s;0.000000;29.000000;0.000000;30.000000"
(gdb) print $foo.return_code
$14 = 0
(gdb) set $foo =$foo.next
(gdb) print $foo.host_name
Cannot access memory at address 0x81678