NAME

       p_cansee — determine visibility of a process

SYNOPSIS

       #include <sys/param.h>
       #include <sys/proc.h>

       int
       p_cansee(struct thread *td, struct proc *p);

DESCRIPTION

       This function can be used to determine if a given process p is visible to the thread td, where the notion
       of “visibility” may be read as “awareness of existence”.

       The function is implemented using cr_cansee(9), and the dependencies on sysctl(8) variables documented in
       the cr_cansee(9) manual page apply.

RETURN VALUES

       The  p_cansee()  function  returns  0  if the process denoted by p is visible by thread td, or a non-zero
       error return value otherwise.

ERRORS

       [ESRCH]            Process p is not visible to thread td as determined by cr_cansee(9).

       [ESRCH]            Thread td has been jailed and process p does not belong to the same jail as td.

       [ESRCH]            The MAC subsystem denied visibility.

SEE ALSO

       jail(2), sysctl(8), cr_cansee(9), mac(9), p_candebug(9), prison_check(9)

Debian                                          November 19, 2006                                    P_CANSEE(9)