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.\" $FreeBSD: release/9.1.0/lib/libc/posix1e/acl_add_perm.3 213573 2010-10-08 12:40:16Z uqs $
.\"
.Dd June 25, 2009
.Dt ACL_ADD_PERM 3
.Os
.Sh NAME
.Nm acl_add_perm
.Nd add permissions to a permission set
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/acl.h
.Ft int
.Fn acl_add_perm "acl_permset_t permset_d" "acl_perm_t perm"
.Sh DESCRIPTION
The
.Fn acl_add_perm
function
is a POSIX.1e call that adds the permission contained in
.Fa perm
to the permission set
.Fa permset_d .
.Pp
Note: it is not considered an error to attempt to add permissions
that already exist in the permission set.
.Pp
For POSIX.1e ACLs, valid values are:
.Bl -column -offset 3n "ACL_WRITE_NAMED_ATTRS"
.It ACL_EXECUTE	Execute permission
.It ACL_WRITE	Write permission
.It ACL_READ	Read permission
.El
.Pp
For NFSv4 ACLs, valid values are:
.Bl -column -offset 3n "ACL_WRITE_NAMED_ATTRS"
.It ACL_READ_DATA		Read permission
.It ACL_LIST_DIRECTORY		Same as ACL_READ_DATA
.It ACL_WRITE_DATA		Write permission, or permission to create files
.It ACL_ADD_FILE		Same as ACL_READ_DATA
.It ACL_APPEND_DATA		Permission to create directories.  Ignored for files
.It ACL_ADD_SUBDIRECTORY	Same as ACL_APPEND_DATA
.It ACL_READ_NAMED_ATTRS	Ignored
.It ACL_WRITE_NAMED_ATTRS	Ignored
.It ACL_EXECUTE			Execute permission
.It ACL_DELETE_CHILD		Permission to delete files and subdirectories
.It ACL_READ_ATTRIBUTES		Permission to read basic attributes
.It ACL_WRITE_ATTRIBUTES	Permission to change basic attributes
.It ACL_DELETE			Permission to delete the object this ACL is placed on
.It ACL_READ_ACL		Permission to read ACL
.It ACL_WRITE_ACL		Permission to change the ACL and file mode
.It ACL_SYNCHRONIZE		Ignored
.El
.Pp
Calling
.Fn acl_add_perm
with
.Fa perm
equal to ACL_WRITE or ACL_READ brands the ACL as POSIX.
Calling it with ACL_READ_DATA, ACL_LIST_DIRECTORY, ACL_WRITE_DATA,
ACL_ADD_FILE, ACL_APPEND_DATA, ACL_ADD_SUBDIRECTORY, ACL_READ_NAMED_ATTRS,
ACL_WRITE_NAMED_ATTRS, ACL_DELETE_CHILD, ACL_READ_ATTRIBUTES,
ACL_WRITE_ATTRIBUTES, ACL_DELETE, ACL_READ_ACL, ACL_WRITE_ACL
or ACL_SYNCHRONIZE brands the ACL as NFSv4.
.Sh RETURN VALUES
.Rv -std acl_add_perm
.Sh ERRORS
The
.Fn acl_add_perm
function fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
Argument
.Fa permset_d
is not a valid descriptor for a permission set within an ACL entry.
Argument
.Fa perm
does not contain a valid
.Vt acl_perm_t
value.
ACL is already branded differently.
.El
.Sh SEE ALSO
.Xr acl 3 ,
.Xr acl_clear_perms 3 ,
.Xr acl_delete_perm 3 ,
.Xr acl_get_brand_np 3 ,
.Xr acl_get_permset 3 ,
.Xr acl_set_permset 3 ,
.Xr posix1e 3
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
.Sh HISTORY
POSIX.1e support was introduced in
.Fx 4.0 .
The
.Fn acl_add_perm
function was added in
.Fx 5.0 .
.Sh AUTHORS
The
.Fn acl_add_perm
function was written by
.An Chris D. Faulhaber Aq jedgar@fxp.org .