NAME

     acl_get_file — get an ACL by filename

LIBRARY

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

SYNOPSIS

     #include <sys/types.h>
     #include <sys/acl.h>

     acl_t
     acl_get_file(const char *path_p, acl_type_t type);

DESCRIPTION

     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 function fails.

     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 argument.

RETURN VALUE

     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 appropriately.

ERRORS

     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 ACL_TYPE_DEFAULT.

     [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 management constraints.

     [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 disabled.

STANDARDS

     IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)

SEE ALSO

     acl_free(3), acl_get_entry(3), acl_get_fd(3), acl_set_file(3), acl(5)

AUTHOR

     Derived from the FreeBSD manual pages written by Robert N M Watson <rwatson@FreeBSD.org>,
     and adapted for Linux by Andreas Gruenbacher <a.gruenbacher@bestbits.at>.