Detecting Symlinks

[fchirigati]

Hi,

I have a program that gets all the files that were read by a running
process, using SystemTap. In order to get this information, I'm using the
probe 'kernel.function("do_filp_open")', since 'syscall.open' may not give
the absolute path.

When one of these files is a symlink, I need to get both symlink and target
file. With kernel.function("do_filp_open"), I get the target file; with
syscall.open, I get the symlink. The problem is that I need the absolute
path of the symlink, and as I said before, syscall.open may not give me the
absolute path.

Does anyone know a better way to detect symbolic links using SystemTap (that
would give me the absolute path)?

By the way, I tried to use syscall.readlink, but nothing happened. I think
this system call is not used by the OS to get the target file, as target
paths are stored in inodes.
I'm on Ubuntu 12.04.

Best,
Fernando.
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