acl_add_perm3

Usage

Library

Linux Access Control Lists library (libacl, -lacl).

Overview

The acl_add_perm() function adds the permission contained in the argument perm (one of ACL_READ, ACL_WRITE, ACL_EXECUTE) to the permission set referred to by the argument permset_d. An attempt to add a permission that is already contained in the permission set is not considered an error.

Any existing descriptors that refer to permset_d continue to refer to that permission set.

Return value

The acl_add_perm() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

Errors

If any of the following conditions occur, the acl_add_perm() function returns -1 and sets errno to the corresponding value:

[EINVAL]

The argument permset_d is not a valid descriptor for a permission set within an ACL entry.

The argument perm does not contain a valid acl_perm_t value.