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nm-otool

42 school project: reproduce the nm and otool commands.

Setup

Launch the Makefile command in the root repository : make

When ft_nm and ft_otool binaries are created, you can use them like the original commands.

For example :

./ft_nm /usr/bin/bash /bin/git
./ft_otool -t /usr/bin/bash /bin/git

What it does ?

The aim of the project is to understand the architecture of objects files like binaries, dynamic libraries, archives. We must understand all parts of Mach-O files and universal binaries (with fat headers).

ft_nm displays the symbol table of an object file in this order : symbol value, symbol type and symbol name.

Options for ft_nm:

  • -A : Display the object file name before all symbols

  • -j : Display only the symbol name

  • -g : Display external symbols

  • -n : Sort symbols by values

  • -p : No sort

  • -r : Reverse sort

  • -u : Display only undefined symbols

  • -U : Don't display undefined symbols

ft_otool displays a specific part of an object file / librairy.

Options for ft_otool:

  • -t : Display the content of __text section

  • -d : Display the content of __data section

  • -h : Display the Mach header

Holy Bible of Mach-O format : OS X ABI Mach-O File Format Reference