The aclbufp argument points to a buffer containing ACL entries. The nentries argument specifies the number of ACL entries in the buffer. The calclass argument, if non-zero, indicates that the CLASS_OBJ (ACL mask) permissions should be recalculated. The union of the permission bits associated with all ACL entries in the buffer other than CLASS_OBJ, OTHER_OBJ, and USER_OBJ is calculated. The result is copied to the permission bits associated with the CLASS_OBJ entry.

The aclsort() function sorts the contents of the ACL buffer as follows:

• Entries will be in the order USER_OBJ, USER, GROUP_OBJ, GROUP, CLASS_OBJ (ACL mask), OTHER_OBJ, DEF_USER_OBJ, DEF_USER, DEF_GROUP_OBJ, DEF_GROUP, DEF_CLASS_OBJ (default ACL mask), and DEF_OTHER_OBJ.
• Entries of type USER, GROUP, DEF_USER, and DEF_GROUP will be sorted in increasing order by ID.

The aclsort() function will succeed if all of the following are true:

• There is exactly one entry each of type USER_OBJ, GROUP_OBJ, CLASS_OBJ (ACL mask), and OTHER_OBJ.
• There is exactly one entry each of type DEF_USER_OBJ, DEF_GROUP_OBJ, DEF_CLASS_OBJ (default ACL mask), and DEF_OTHER_OBJ if there are any default entries.
• Entries of type USER, GROUP, DEF_USER, or DEF_GROUP may not contain duplicate entries. A duplicate entry is one of the same type containing the same numeric ID.

Upon successful completion, the the function returns 0. Otherwise, it returns -1.

See attributes(5) for descriptions of the following attributes:

acl(2), aclcheck(3SEC), attributes(5)