p1003_1b.c revision 45739 
1/*
2 * Copyright (c) 1996, 1997, 1998
3 *	HD Associates, Inc.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by HD Associates, Inc
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34/* p1003_1b: Real Time common code.
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/sysent.h>
41#include <sys/proc.h>
42#include <sys/syslog.h>
43#include <sys/module.h>
44#include <sys/sysproto.h>
45#include <sys/sysctl.h>
46
47#include <posix4/posix4.h>
48
49MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
50
51/* p31b_proc: Return a proc struct corresponding to a pid to operate on.
52 *
53 * Enforce permission policy.
54 *
55 * The policy is the same as for sending signals except there
56 * is no notion of process groups.
57 *
58 * pid == 0 means my process.
59 *
60 * This is disabled until I've got a permission gate in again:
61 * only root can do this.
62 */
63
64#if 0
65/*
66 * This is stolen from CANSIGNAL in kern_sig:
67 *
68 * Can process p, with pcred pc, do "write flavor" operations to process q?
69 */
70#define CAN_AFFECT(p, pc, q) \
71	((pc)->pc_ucred->cr_uid == 0 || \
72	    (pc)->p_ruid == (q)->p_cred->p_ruid || \
73	    (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \
74	    (pc)->p_ruid == (q)->p_ucred->cr_uid || \
75	    (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid)
76#else
77#define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0)
78#endif
79
80/*
81 * p31b_proc: Look up a proc from a PID.  If proc is 0 it is
82 * my own proc.
83 */
84int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
85{
86	int ret = 0;
87	struct proc *other_proc = 0;
88
89	if (pid == 0)
90		other_proc = p;
91	else
92		other_proc = pfind(pid);
93
94	if (other_proc)
95	{
96		/* Enforce permission policy.
97		 */
98		if (CAN_AFFECT(p, p->p_cred, other_proc))
99			*pp = other_proc;
100		else
101			ret = EPERM;
102	}
103	else
104		ret = ESRCH;
105
106	return ret;
107}
108
109/* The system calls return ENOSYS if an entry is called that is
110 * not run-time supported.  I am also logging since some programs
111 * start to use this when they shouldn't.  That will be removed if annoying.
112 */
113int
114syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap)
115{
116	log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
117			p->p_comm, p->p_pid, s);
118
119	/* a " return nosys(p, uap); " here causes a core dump.
120	 */
121
122	return ENOSYS;
123}
124
125#if !defined(_KPOSIX_PRIORITY_SCHEDULING)
126
127/* Not configured but loadable via a module:
128 */
129
130static int sched_attach(void)
131{
132	return 0;
133}
134
135SYSCALL_NOT_PRESENT_GEN(sched_setparam)
136SYSCALL_NOT_PRESENT_GEN(sched_getparam)
137SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
138SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
139SYSCALL_NOT_PRESENT_GEN(sched_yield)
140SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
141SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
142SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
143
144#else
145
146/* Configured in kernel version:
147 */
148static struct ksched *ksched;
149
150static int sched_attach(void)
151{
152	int ret = ksched_attach(&ksched);
153
154	if (ret == 0)
155		p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
156
157	return ret;
158}
159
160int sched_setparam(struct proc *p,
161	struct sched_setparam_args *uap)
162{
163	int e;
164
165	struct sched_param sched_param;
166	copyin(uap->param, &sched_param, sizeof(sched_param));
167
168	(void) (0
169	|| (e = p31b_proc(p, uap->pid, &p))
170	|| (e = ksched_setparam(&p->p_retval[0], ksched, p,
171		(const struct sched_param *)&sched_param))
172	);
173
174	return e;
175}
176
177int sched_getparam(struct proc *p,
178	struct sched_getparam_args *uap)
179{
180	int e;
181	struct sched_param sched_param;
182
183	(void) (0
184	|| (e = p31b_proc(p, uap->pid, &p))
185	|| (e = ksched_getparam(&p->p_retval[0], ksched, p, &sched_param))
186	);
187
188	if (!e)
189		copyout(&sched_param, uap->param, sizeof(sched_param));
190
191	return e;
192}
193int sched_setscheduler(struct proc *p,
194	struct sched_setscheduler_args *uap)
195{
196	int e;
197
198	struct sched_param sched_param;
199	copyin(uap->param, &sched_param, sizeof(sched_param));
200
201	(void) (0
202	|| (e = p31b_proc(p, uap->pid, &p))
203	|| (e = ksched_setscheduler(&p->p_retval[0],
204	ksched, p, uap->policy,
205		(const struct sched_param *)&sched_param))
206	);
207
208	return e;
209}
210int sched_getscheduler(struct proc *p,
211	struct sched_getscheduler_args *uap)
212{
213	int e;
214	(void) (0
215	|| (e = p31b_proc(p, uap->pid, &p))
216	|| (e = ksched_getscheduler(&p->p_retval[0], ksched, p))
217	);
218
219	return e;
220}
221int sched_yield(struct proc *p,
222	struct sched_yield_args *uap)
223{
224	return ksched_yield(&p->p_retval[0], ksched);
225}
226int sched_get_priority_max(struct proc *p,
227	struct sched_get_priority_max_args *uap)
228{
229	return ksched_get_priority_max(&p->p_retval[0],
230	ksched, uap->policy);
231}
232int sched_get_priority_min(struct proc *p,
233	struct sched_get_priority_min_args *uap)
234{
235	return ksched_get_priority_min(&p->p_retval[0],
236	ksched, uap->policy);
237}
238int sched_rr_get_interval(struct proc *p,
239	struct sched_rr_get_interval_args *uap)
240{
241	int e;
242
243	(void) (0
244	|| (e = p31b_proc(p, uap->pid, &p))
245	|| (e = ksched_rr_get_interval(&p->p_retval[0], ksched,
246	p, uap->interval))
247	);
248
249	return e;
250}
251
252#endif
253
254static void p31binit(void *notused)
255{
256	(void) sched_attach();
257	p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
258}
259
260SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);
261