/*
* 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 a module:
*/
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();
p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
}
SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);
