Provided by: freebsd-manpages_12.0-1_all
p_cansee — determine visibility of a process
#include <sys/param.h> #include <sys/proc.h> int p_cansee(struct thread *td, struct proc *p);
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.
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.
[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.
jail(2), sysctl(8), cr_cansee(9), mac(9), p_candebug(9), prison_check(9)