66 lines
1.0 KiB
C
66 lines
1.0 KiB
C
/*
|
|
* Copyright (c) 1986 Regents of the University of California.
|
|
* All rights reserved. The Berkeley software License Agreement
|
|
* specifies the terms and conditions for redistribution.
|
|
*/
|
|
#include "param.h"
|
|
#include "user.h"
|
|
#include "proc.h"
|
|
#include "systm.h"
|
|
|
|
/*
|
|
* Is p an inferior of the current process?
|
|
*/
|
|
int
|
|
inferior(p)
|
|
register struct proc *p;
|
|
{
|
|
for (; p != u.u_procp; p = p->p_pptr)
|
|
if (p->p_ppid == 0)
|
|
return (0);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Find a process by pid.
|
|
*/
|
|
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
|
|
*/
|
|
void
|
|
pqinit()
|
|
{
|
|
register struct proc *p;
|
|
|
|
/*
|
|
* most procs are initially on freequeue
|
|
* nb: we place them there in their "natural" order.
|
|
*/
|
|
|
|
freeproc = NULL;
|
|
for (p = proc+NPROC; --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;
|
|
}
|