View Members of a Chain While Debugging with GDB

To print a element of the whole chain, user-defined commands can help.

A user-defined command is a sequence of gdb commands to which you assign a new name as a command.

An example:

define dump_node
    set $_node = (Type*)$arg0
    while $_node
        printf "value is %d\n", $_node->value
        set $_node = $_node->next
    end
end

User-defined command start with define command-name, the example above defines a command named dump_list. $arg0 stands for the first argument of the command, more arguments can be accepted, and the limitation is 10 ($arg9).

Save these user-defined command in a file, say gdb.sh. To make it come into effect, using source command in gdb shell:

source gdb.sh

use command:

dump_node node

You can also create a correspongding help info using document. See the example below:

document dump_node
    usage: dump_node _node
    dump_node is used to dump all elements in _node chain.
    arg0 is the head of the chain.
end

Document of a command is optional. Check these info in gdb shell:

help dump_node

Ref:
User-defined Command