cc [ flag… ] file… –lsec [ library… ] #include <sys/acl.h> int acl_trivial(char *path);
The acl_trivial() function is used to determine whether a file has a trivial ACL. Whether an ACL is trivial depends on the type of the ACL. A POSIX draft ACL is nontrivial if it has greater than MIN_ACL_ENTRIES. An NFSv4/ZFS-style ACL is nontrivial if it either has entries other than owner@, group@, and everyone@, has inheritance flags set, or is not ordered in a manner that meets POSIX access control requirements.
Upon successful completion, acl_trivial() returns 0 if the file's ACL is trivial and 1 if the file's ACL is not trivial. If it could not be determined whether a file's ACL is trivial, -1 is returned and errno is set to indicate the error.
The acl_trivial() function will fail if:
A file's ACL could not be read.
A component of path does not name an existing file or path is an empty string.
See attributes(5) for descriptions of the following attributes: