Using both `fprintf` and `perror` seems redundant. Simply `perror("unveil")` is sufficient.

The `target_path` is effectively the same as `cwd` which is defined and unveiled earlier. `target_path` is a more future-proof name and it would make sense to group these together and use the same variable. This way, if someone adds support for decompressing to a user-specified directory (ie, `unzip -d /output/path`) in the future, they only need to change one line as there's no hard coded assumption of operating in the working directory.

Using both `fprintf` and `perror` seems redundant. Simply `perror("unveil")` is sufficient.