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Make rtprio work again.

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- add a missing break which caused RTP_SET to always return EINVAL
- break instead of returning if p_can fails so proc_lock is always
  dropped correctly
- only copyin data that is actually needed
- use break instead of goto
- make rtp_to_pri return EINVAL instead of -1 if the values are out
  or range so we don't have to translate
This commit is contained in:
Jake Burkholder 2001-04-29 22:09:26 +00:00
parent 703471ec7f
commit e6af1080c2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76141
1 changed files with 14 additions and 19 deletions
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33
sys/kern/kern_resource.c
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@ -252,35 +252,32 @@ rtprio(curp, uap)
struct rtprio rtp;
int error;
error = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
if (error)
return (error);
if (uap->pid == 0) {
p = curp;
PROC_LOCK(p);
} else
p = pfind(uap->pid);
if (p == 0)
if (p == NULL)
return (ESRCH);
switch (uap->function) {
case RTP_LOOKUP:
if ((error = p_can(curp, p, P_CAN_SEE, NULL)))
return (error);
break;
pri_to_rtp(&p->p_pri, &rtp);
PROC_UNLOCK(p);
return (copyout(&rtp, uap->rtp, sizeof(struct rtprio)));
error = copyout(&rtp, uap->rtp, sizeof(struct rtprio));
break;
case RTP_SET:
if ((error = p_can(curp, p, P_CAN_SCHED, NULL)))
goto out;
if ((error = p_can(curp, p, P_CAN_SCHED, NULL)) ||
(error = copyin(uap->rtp, &rtp, sizeof(struct rtprio))))
break;
/* disallow setting rtprio in most cases if not superuser */
if (suser(curp) != 0) {
/* can't set someone else's */
if (uap->pid) {
error = EPERM;
goto out;
break;
}
/* can't set realtime priority */
/*
@ -295,17 +292,15 @@ rtprio(curp, uap)
#endif
if (rtp.type != RTP_PRIO_NORMAL) {
error = EPERM;
goto out;
break;
}
}
if (rtp_to_pri(&rtp, &p->p_pri) == 0)
error = 0;
else
error = EINVAL;
error = rtp_to_pri(&rtp, &p->p_pri);
break;
default:
error = EINVAL;
break;
}
out:
PROC_UNLOCK(p);
return (error);
}
@ -315,7 +310,7 @@ rtp_to_pri(struct rtprio *rtp, struct priority *pri)
{
if (rtp->prio > RTP_PRIO_MAX)
return (-1);
return (EINVAL);
switch (RTP_PRIO_BASE(rtp->type)) {
case RTP_PRIO_REALTIME:
pri->pri_level = PRI_MIN_REALTIME + rtp->prio;
@ -327,7 +322,7 @@ rtp_to_pri(struct rtprio *rtp, struct priority *pri)
pri->pri_level = PRI_MIN_IDLE + rtp->prio;
break;
default:
return (-1);
return (EINVAL);
}
pri->pri_class = rtp->type;
pri->pri_native = pri->pri_level;