NAME

     acl_set_file — set an ACL by filename

LIBRARY

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

SYNOPSIS

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

     int
     acl_set_file(const char *path_p, acl_type_t type, acl_t acl);

DESCRIPTION

     The acl_set_file() function associates an access ACL with a file or directory, or associates
     a default ACL with a directory. The pathname for the file or directory is pointed to by the
     argument path_p.

     The effective user ID of the process must match the owner of the file or directory or the
     process must have the CAP_FOWNER capability for the request to succeed.

     The value of the argument type is used to indicate whether the access ACL or the default ACL
     associated with path_p is being set. If the type parameter is ACL_TYPE_ACCESS, the access
     ACL of path_p shall be set. If the type parameter is ACL_TYPE_DEFAULT, the default ACL of
     path_p shall be set. If the argument type specifies a type of ACL that cannot be associated
     with path_p, then the function fails.

     The acl parameter must reference a valid ACL according to the rules described on the
     acl_valid(3) manual page if the type parameter is ACL_TYPE_ACCESS, and must either reference
     a valid ACL or an ACL with zero ACL entries if the type parameter is ACL_TYPE_DEFAULT. If
     the acl parameter references an empty ACL, then the acl_set_file() function removes any
     default ACL associated with the directory referred to by the path_p parameter.

RETURN VALUE

     The acl_set_file() 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_set_file() function returns -1 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 acl does not point to a valid ACL.

                        The ACL has more entries than the file referred to by path_p can obtain.

                        The type parameter is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT.

                        The type parameter is ACL_TYPE_DEFAULT, but the file referred to by
                        path_p is not a directory.

     [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.

     [ENOSPC]           The directory or file system that would contain the new ACL cannot be
                        extended or the file system is out of file allocation resources.

     [ENOTDIR]          A component of the path prefix is not a directory.

     [ENOTSUP]          The file identified by path_p cannot be associated with the ACL because
                        the file system on which the file is located does not support this.

     [EPERM]            The process does not have appropriate privilege to perform the operation
                        to set the ACL.

     [EROFS]            This function requires modification of a file system which is currently
                        read-only.

STANDARDS

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

     The behavior of acl_set_file() when the acl parameter refers to an empty ACL and the type
     parameter is ACL_TYPE_DEFAULT is an extension in the Linux implementation, in order that all
     values returned by acl_get_file() can be passed to acl_set_file().  The POSIX.1e function
     for removing a default ACL is acl_delete_def_file().

SEE ALSO

     acl_delete_def_file(3), acl_get_file(3), acl_set_fd(3), acl_valid(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>.