acl_get_file - get an ACL by filename
Linux Access Control Lists library (libacl, -lacl).
acl_get_file(const char *path_p, acl_type_t type);
The acl_get_file() function retrieves the access ACL associated with a
file or directory, or the default ACL associated with a directory. The
pathname for the file or directory is pointed to by the argument path_p.
The ACL is placed into working storage and acl_get_file() returns a
pointer to that storage.
In order to read an ACL from an object, a process must have read access
to the object’s attributes.
The value of the argument type is used to indicate whether the access ACL
or the default ACL associated with path_p is returned. If type is
ACL_TYPE_ACCESS, the access ACL of path_p is returned. If type is
ACL_TYPE_DEFAULT, the default ACL of path_p is returned. If type is
ACL_TYPE_DEFAULT and no default ACL is associated with the directory
path_p, then an ACL containing zero ACL entries is returned. If type
specifies a type of ACL that cannot be associated with path_p, then the
This function may cause memory to be allocated. The caller should free
any releasable memory, when the new ACL is no longer required, by calling
acl_free(3) with the (void*)acl_t returned by acl_get_file() as an
On success, this function returns a pointer to the working storage. On
error, a value of (acl_t)NULL is returned, and errno is set
If any of the following conditions occur, the acl_get_file() function
returns a value of (acl_t)NULL and sets errno to the corresponding value:
[EACCES] Search permission is denied for a component of the
path prefix or the object exists and the process does
not have appropriate access rights.
Argument type specifies a type of ACL that cannot be
associated with path_p.
[EINVAL] The argument type is not ACL_TYPE_ACCESS or
[ENAMETOOLONG] The length of the argument path_p is too long.
[ENOENT] The named object does not exist or the argument path_p
points to an empty string.
[ENOMEM] The ACL working storage requires more memory than is
allowed by the hardware or system-imposed memory
[ENOTDIR] A component of the path prefix is not a directory.
[ENOTSUP] The file system on which the file identified by path_p
is located does not support ACLs, or ACLs are
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
acl_free(3), acl_get_entry(3), acl_get_fd(3), acl_set_file(3), acl(5)
Derived from the FreeBSD manual pages written by Robert N M Watson
〈rwatson@FreeBSD.org〉, and adapted for Linux by Andreas Gruenbacher