.\" Access Control Lists manual pages
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.\" (C) 2002 Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
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.Dd March 23, 2002
.Dt ACL_GET_PERM 3
.Os "Linux ACL"
.Sh NAME
.Nm acl_get_perm
.Nd test for a permission in an ACL permission set
.Sh LIBRARY
Linux Access Control Lists library (libacl, \-lacl).
.Sh SYNOPSIS
.In sys/types.h
.In acl/libacl.h
.Ft int
.Fn acl_get_perm "acl_permset_t permset_d" "acl_perm_t perm"
.Sh DESCRIPTION
The
.Fn acl_get_perm
function tests if the permission specified by the argument
.Va perm
(one of ACL_READ, ACL_WRITE, ACL_EXECUTE)
is contained in the ACL permission set pointed to by the argument
.Va permset_d .
.Pp
Any existing descriptors that refer to
.Va permset_d
continue to refer to that permission set.
.Sh RETURN VALUE
If successful, the
.Fn acl_get_perm
function returns
.Li 1
if the permission specified by
.Va perm
is contained in the ACL permission set
.Va permset_d ,
and
.Li 0
if the permission is not contained in the permission set. Otherwise,
the value
.Li -1
is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
If any of the following conditions occur, the
.Fn acl_get_perm
function returns
.Li -1
and sets
.Va errno
to the corresponding value:
.Bl -tag -width Er
.It Bq Er EINVAL
The argument
.Va permset_d
is not a valid descriptor for a permission set within an ACL entry.
.Pp
The argument
.Va perm
is not a valid
.Va acl_perm_t
value.
.El
.Sh STANDARDS
This is a non-portable, Linux specific extension to the ACL manipulation
functions defined in IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned).
.Sh SEE ALSO
.Xr acl_add_perm 3 ,
.Xr acl_clear_perms 3 ,
.Xr acl_delete_perm 3 ,
.Xr acl_get_permset 3 ,
.Xr acl_set_permset 3 ,
.Xr acl 5
.Sh AUTHOR
Written by
.An "Andreas Gruenbacher" Aq andreas.gruenbacher@gmail.com .