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.Dd June 3, 2022
.Dt PRIV_SET 3C
.Os
.Sh NAME
.Nm priv_set ,
.Nm priv_ineffect
.Nd change privilege sets and check whether privileges are set
.Sh SYNOPSIS
.In priv.h
.Ft int
.Fo priv_set
.Fa "priv_op_t op"
.Fa "priv_ptype_t which"
.Fa "..."
.Fc
.Ft boolean_t
.Fo priv_ineffect
.Fa "const char *priv"
.Fc
.Sh DESCRIPTION
.Fn priv_set
is a convenient wrapper for the
.Xr setppriv 2
function.
It takes three or more arguments.
The operation argument,
.Ar op ,
can be one of
.Dv PRIV_OFF , PRIV_ON
or
.Dv PRIV_SET .
The
.Ar which
argument is the name of the privilege set to change, one of
.Dv PRIV_EFFECTIVE , PRIV_INHERITABLE , PRIV_PERMITTED , PRIV_LIMIT
or the special pseudo set
.Dv PRIV_ALLSETS
if the operation should be applied to all privilege sets.
Subsequent arguments provide zero or more privilege names, terminated with a
.Dv NULL
pointer.
See
.Sx EXAMPLES .
.Pp
The specified privileges are converted to a binary privilege set and
.Xr setppriv 2
is called with the same
.Ar op
and
.Ar which
arguments.
When called with
.Dv PRIV_ALLSETS
as the value for the
.Ar which
argument,
.Xr setppriv 2
is called for each set in turn, aborting on the first failed call.
.Pp
.Fn priv_ineffect
is a convenient wrapper for the
.Xr getppriv 2
function.
The
.Ar priv
argument specifies the name of a privilege, and this function checks for its
presence in the effective set.
.Sh RETURN VALUES
Upon successful completion,
.Fn priv_set
return 0.
Otherwise, -1  is returned and
.Dv errno
is set to indicate the error.
.Pp
If
.Ar priv
is a valid privilege that is a member of the effective set,
.Fn priv_ineffect
returns
.Dv B_TRUE .
Otherwise, it returns
.Dv B_FALSE
and sets
.Dv errno
to indicate the error.
.Sh EXAMPLES
.Sy Example 1
Using
.Fn priv_set
.Bd -literal -offset 6n
#include <priv.h>
\&...
/* Remove basic privileges we don't need */
(void) priv_set(PRIV_OFF, PRIV_PERMITTED, PRIV_PROC_EXEC,
    PRIV_PROC_INFO, PRIV_FILE_LINK_ANY, PRIV_PROC_SESSION,
    NULL);
.Ed
.Sh ERRORS
The
.Fn priv_set
function will fail if:
.Bl -tag -width Ds
.It Er EINVAL
The value of
.Ar op
or
.Ar which
is out of range.
.It Er ENOMEM
Insufficient memory was allocated.
.It Er EPERM
The application attempted to add privileges to
.Dv PRIV_LIMIT
or
.Dv PRIV_PERMITTED ,
or the application attempted to add privileges to
.Dv PRIV_INHERITABLE
or
.Dv PRIV_EFFECTIVE
that were not in
.Dv PRIV_PERMITTED .
.El
.Pp
The
.Fn priv_ineffect
function will fail if:
.Bl -tag -width Ds
.It Er EINVAL
The privilege specified by
.Ar priv
is invalid.
.It Er ENOMEM
Insufficient memory was allocated.
.El
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
.Sy MT-Safe
.Sh SEE ALSO
.Xr setppriv 2 ,
.Xr priv_str_to_set 3C ,
.Xr attributes 7 ,
.Xr privileges 7