Little note about GDB

This is just for myself as I'm not the guy who uses debugger much. However sometimes it helps when you have core dump for the program you are running. This is simple one of what you can examine with the core dump file.

shell>gdb bro bro.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `bro'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libmagic.so.3...done.
Loaded symbols for /usr/lib/libmagic.so.3
Reading symbols from /lib/libz.so.4...done.
Loaded symbols for /lib/libz.so.4
Reading symbols from /usr/lib/libssl.so.5...done.
Loaded symbols for /usr/lib/libssl.so.5
Reading symbols from /lib/libcrypto.so.5...done.
Loaded symbols for /lib/libcrypto.so.5
Reading symbols from /lib/libncurses.so.7...done.
Loaded symbols for /lib/libncurses.so.7
Reading symbols from /usr/lib/libstdc++.so.6...done.
Loaded symbols for /usr/lib/libstdc++.so.6
Reading symbols from /lib/libm.so.5...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x080518ef in copy_string () at SSLInterpreter.cc:30
30 */

(gdb) print copy_string
$1 = {} 0x80518d0

(gdb) bt
#0 0x080518ef in copy_string () at SSLInterpreter.cc:30
#1 0x0809e249 in DNS_Mapping (this=0x843e6c8,
host=0x810e00c1

, h=0x830c0d0)
at DNS_Mgr.cc:171
#2 0x080a049f in DNS_Mgr::AddResult (this=0x830bd68, dr=0x843e210,
r=0xbfbf9070) at DNS_Mgr.cc:697
#3 0x080a08d6 in DNS_Mgr::Resolve (this=0x830bd68) at DNS_Mgr.cc:601
#4 0x080a0edd in DNS_Mgr::LookupHost (this=0x830bd68,
name=0x843398e "l.root-servers.net") at DNS_Mgr.cc:485
#5 0x0806826a in brolex () at scan.l:330
#6 0x08053d5c in yyparse () at p.c:2277
#7 0x0804efb6 in main (argc=5, argv=0xbfbfebac) at main.cc:751

(gdb) up
#1 0x0809e249 in DNS_Mapping (this=0x843e6c8,
host=0x810e00c1

, h=0x830c0d0)
at DNS_Mgr.cc:171
171 req_host = copy_string(host);

I'm still learning how to interpret them correctly, hopefully more to come.

Cheers ;]