pfind9
Locate a process by number
Usage
#include <sys/param.h>
#include <sys/proc.h>
struct proc *
pfind(pid_t pid);
struct proc *
zpfind(pid_t pid);
Overview
pfind() takes a pid as its argument and returns a pointer to the proc structure whose PID is specified in the argument only if the pid is on the allproc list.
zpfind() takes a pid as its argument. If zpfind() finds a process whose PID is equal to that of argument and is a zombie process, meaning that it must reside on the zombproc list, zpfind() returns a pointer to that proc structure.
Both pfind() and zpfind() lock the proc structure that is returned using PROC_LOCK(p).
Return values
pfind() and zpfind() return a pointer to a proc structure on success and a NULL on failure.