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The Posix ACL user library
==========================
The Posix ACL manipulation functions defined in Posix 1003.1e DS17 are
declared in <sys/acl.h>; you need to link against libacl.a for these
functions to be included in your binaries.
There is an additional header file <acl/libacl.h> that gives you
access to some extensions that are also contained in the same library.
The functions declared there are:
acl_to_any_text()
Similar to acl_to_text(), but also allows you to specify:
- a prefix string that is printed before each ACL entry.
- a separator character that is printed between two ACL entries.
- a set of options (TEXT_* constants).
This function returns the length in characters of the text returned
in the len_p parameter, unless len_p is NULL. The returned string
must be freed using the acl_free() function.
Returns NULL and sets errno accordingly on error.
acl_entry_to_any_str()
Converts a single ACL entry to text, filling a buffer. It takes as
additional parameter the ACL mask entry (which is used to computer
the effective permissions if specified). The prefix and options are
the same as for acl_to_any_text().
Returns -1 and sets errno accordingly on error.
acl_cmp()
Returns 0 if both ACLs are equal, and 1 otherwise.
Returns -1 and sets errno accordingly on error.
acl_check()
Checks an ACL for validity, similar to acl_valid. Returns the entry
at which an error occurred in last (unless last is NULL), and
returns a positive error code (ACL_*_ERROR) if the ACL is invalid; 0
on success.
Returns -1 and sets errno accordingly on error.
acl_equiv_mode()
Checks if an ACL is a basic ACL. If so, returns 0 and sets mode_p to
the file mode permission bits that correspond to the ACL. Returns 1
otherwise.
Returns -1 and sets errno accordingly on error.
acl_entries()
Returns the number of entries in an ACL.
Returns -1 and sets errno accordingly on error.
acl_error()
Returns a textual message describing the error code returned by
acl_check().
acl_get_perm()
Check if a permission is set in a permission set (acl_permset_t).
Returns 1 if the permission is set, or 0 if it is not set.
Returns -1 and sets errno if an error occurs.
Andreas
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