2.11BSD/sys/sys/kern_proc.c

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/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)kern_proc.c	2.1 (2.11BSD) 1999/8/11
 */

#include "param.h"
#include "user.h"
#include "proc.h"
#include "systm.h"

/*
 * Is p an inferior of the current process?
 */
inferior(p)
	register struct proc *p;
{

	for (; p != u.u_procp; p = p->p_pptr)
		if (p->p_ppid == 0)
			return (0);
	return (1);
}

struct proc *
pfind(pid)
	register int pid;
{
	register struct proc *p = pidhash[PIDHASH(pid)];

	for (; p; p = p->p_hash)
		if (p->p_pid == pid)
			return (p);
	return ((struct proc *)0);
}

/*
 * init the process queues
 */
pqinit()
{
	register struct proc *p;

	/*
	 * most procs are initially on freequeue
	 *	nb: we place them there in their "natural" order.
	 */

	freeproc = NULL;
	for (p = procNPROC; --p > proc; freeproc = p)
		p->p_nxt = freeproc;

	/*
	 * but proc[0] is special ...
	 */

	allproc = p;
	p->p_nxt = NULL;
	p->p_prev = &allproc;

	zombproc = NULL;
}