linux man page for p_cansee

P_CANSEE(9)						   BSD Kernel Developer's Manual					       P_CANSEE(9)

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)

BSD
								 November 19, 2006							       BSD