This function can be used to determine if a given process
Fa p
is visible to the thread
Fa td ,
where the notion of
``visibility''
may be read as
``awareness of existence''
The function is implemented using
cr_cansee9,
and the dependencies on
sysctl(8)
variables documented in the
cr_cansee9
manual page apply.
RETURN VALUES
The
p_cansee ();
function
returns
0
if the process denoted by
Fa p
is visible by thread
Fa td ,
or a non-zero error return value otherwise.
ERRORS
Bq Er ESRCH
Process
Fa p
is not visible to thread
Fa td
as determined by
cr_cansee9.
Bq Er ESRCH
Thread
Fa td
has been jailed and process
Fa p
does not belong to the same jail as
Fa td .
