Re: Question regarding UNIX access() call

Fantoosh B <fantooshb@xxxxxxxxx> writes:

I was wondering if there is a function similar to access(2), but one
that uses *effective* userid and groupid rather than *real*?

Not a standard one. (Solaris, e.g., has eaccess() in a separate library
and a secret "E_OK" flag which you can or in to the access flags)

For instance, in order to test whether the process has execute
permissions on the file I can call access(file, X_OK). However, I want
to check if my effective UID/GID and supplementary groups allow me to
execute this file. How can I do this kind of check?
I can certainly read the access control list using libacl, but I
guess there must be simpler way to do it.

You are approaching this incorrectly because you can never be sure
you can execute a program before you actually executed it.

Is there any reason why you can't "just do it"?

Casper
.

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