Function rewrite_path_arg_at 

pub fn rewrite_path_arg_at(
    ctx: &Ctx,
    fs: &Fs,
    regs: &mut Regs,
    dirfd_index: Option<usize>,
    path_index: usize,
    deref_final: bool,
) -> Result<(), i32>

Translates a dirfd-relative path argument and points it at the host path.

After the rewrite the path is absolute, so the dirfd argument (if any) is set to AT_FDCWD.

Arguments

• ctx - Shared supervisor state.
• fs - The tracee’s filesystem view.
• regs - Registers at the stop.
• dirfd_index - Argument index of the directory descriptor, if the syscall has one.
• path_index - Argument index holding the path pointer.
• deref_final - Follow a trailing symlink.