freebsd-dev/sys/posix4/p1003_1b.c
Peter Dufault aebde78243 1. Add new defs for mins and maxs for the POSIX flavor priorities. They
end up being the same, but it doesn't look like you're comparing
apples and oranges.

2. Use need_resched instead of reset_priority.  This isn't right
either, since for example you'll round-robin against equal priority FIFO
processes when lowering the priority of another process,
but this works better and a real fix needs to be in kern_synch and
not out here.

3. This is not a device driver: copyin/copyout the structure.
1998-05-19 21:11:53 +00:00

260 lines
6.4 KiB
C

/*
* Copyright (c) 1996, 1997, 1998
* HD Associates, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by HD Associates, Inc
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/* p1003_1b: Real Time common code.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysent.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/module.h>
#include <sys/sysproto.h>
#include <sys/sysctl.h>
#include <posix4/posix4.h>
MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
/* p31b_proc: Return a proc struct corresponding to a pid to operate on.
*
* Enforce permission policy.
*
* The policy is the same as for sending signals except there
* is no notion of process groups.
*
* pid == 0 means my process.
*
* This is disabled until I've got a permission gate in again:
* only root can do this.
*/
#if 0
/*
* This is stolen from CANSIGNAL in kern_sig:
*
* Can process p, with pcred pc, do "write flavor" operations to process q?
*/
#define CAN_AFFECT(p, pc, q) \
((pc)->pc_ucred->cr_uid == 0 || \
(pc)->p_ruid == (q)->p_cred->p_ruid || \
(pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \
(pc)->p_ruid == (q)->p_ucred->cr_uid || \
(pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid)
#else
#define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0)
#endif
/*
* p31b_proc: Look up a proc from a PID. If proc is 0 it is
* my own proc.
*/
int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
{
int ret = 0;
struct proc *other_proc = 0;
if (pid == 0)
other_proc = p;
else
other_proc = pfind(pid);
if (other_proc)
{
/* Enforce permission policy.
*/
if (CAN_AFFECT(p, p->p_cred, other_proc))
*pp = other_proc;
else
ret = EPERM;
}
else
ret = ESRCH;
return ret;
}
/* The system calls return ENOSYS if an entry is called that is
* not run-time supported. I am also logging since some programs
* start to use this when they shouldn't. That will be removed if annoying.
*/
int
syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap)
{
log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
p->p_comm, p->p_pid, s);
/* a " return nosys(p, uap); " here causes a core dump.
*/
return ENOSYS;
}
#if !defined(_KPOSIX_PRIORITY_SCHEDULING)
/* Not configured but loadable via an LKM:
*/
static int sched_attach(void)
{
return 0;
}
SYSCALL_NOT_PRESENT_GEN(sched_setparam)
SYSCALL_NOT_PRESENT_GEN(sched_getparam)
SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
SYSCALL_NOT_PRESENT_GEN(sched_yield)
SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
#else
/* Configured in kernel version:
*/
static struct ksched *ksched;
static int sched_attach(void)
{
int ret = ksched_attach(&ksched);
if (ret == 0)
p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
return ret;
}
int sched_setparam(struct proc *p,
struct sched_setparam_args *uap)
{
int e;
struct sched_param sched_param;
copyin(uap->param, &sched_param, sizeof(sched_param));
(void) (0
|| (e = p31b_proc(p, uap->pid, &p))
|| (e = ksched_setparam(&p->p_retval[0], ksched, p,
(const struct sched_param *)&sched_param))
);
return e;
}
int sched_getparam(struct proc *p,
struct sched_getparam_args *uap)
{
int e;
struct sched_param sched_param;
(void) (0
|| (e = p31b_proc(p, uap->pid, &p))
|| (e = ksched_getparam(&p->p_retval[0], ksched, p, &sched_param))
);
if (!e)
copyout(&sched_param, uap->param, sizeof(sched_param));
return e;
}
int sched_setscheduler(struct proc *p,
struct sched_setscheduler_args *uap)
{
int e;
struct sched_param sched_param;
copyin(uap->param, &sched_param, sizeof(sched_param));
(void) (0
|| (e = p31b_proc(p, uap->pid, &p))
|| (e = ksched_setscheduler(&p->p_retval[0],
ksched, p, uap->policy,
(const struct sched_param *)&sched_param))
);
return e;
}
int sched_getscheduler(struct proc *p,
struct sched_getscheduler_args *uap)
{
int e;
(void) (0
|| (e = p31b_proc(p, uap->pid, &p))
|| (e = ksched_getscheduler(&p->p_retval[0], ksched, p))
);
return e;
}
int sched_yield(struct proc *p,
struct sched_yield_args *uap)
{
return ksched_yield(&p->p_retval[0], ksched);
}
int sched_get_priority_max(struct proc *p,
struct sched_get_priority_max_args *uap)
{
return ksched_get_priority_max(&p->p_retval[0],
ksched, uap->policy);
}
int sched_get_priority_min(struct proc *p,
struct sched_get_priority_min_args *uap)
{
return ksched_get_priority_min(&p->p_retval[0],
ksched, uap->policy);
}
int sched_rr_get_interval(struct proc *p,
struct sched_rr_get_interval_args *uap)
{
int e;
(void) (0
|| (e = p31b_proc(p, uap->pid, &p))
|| (e = ksched_rr_get_interval(&p->p_retval[0], ksched,
p, uap->interval))
);
return e;
}
#endif
static void p31binit(void *notused)
{
(void) sched_attach();
}
SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);