p_cansee9
Determine visibility of a process
Usage
#include <sys/proc.h>
int
p_cansee(struct thread *td, struct proc *p);
Overview
This function determines if a given process p is visible to the thread td, where the notion of “visibility” may be read as “awareness of existence”.
This function explicitly allows a thread to always see its own process, even with pending credentials changes( see ucred(9)). Otherwise, it simply defers to cr_cansee(9).
Return values
The p_cansee() function returns 0 if the process denoted by p is visible by thread td, or ESRCH otherwise.
Errors
- [ESRCH]
-
Thread td is not part of process p and cannot see it as determined by cr_cansee(9).
Releases
46 releases since FreeBSD 6.3-RELEASE; the text changed 33 times.